XMLHttpRequest Standard
XMLHttpRequest
Living Standard — Last Updated
15 March 2026
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Abstract
The XMLHttpRequest Standard defines an API that provides scripted client functionality for transferring data between a client and a server.
1.
Introduction
This section is non-normative.
The
XMLHttpRequest
object is an API for
fetching
resources.
The name
XMLHttpRequest
is historical and has no bearing on its functionality.
Some simple code to do something with data from an XML document
fetched over the network:
function
processData
data
// taking care of data
function
handler
()
if
this
status
==
200
&&
this
responseXML
!=
null
&&
this
responseXML
getElementById
'test'
).
textContent
// success!
processData
this
responseXML
getElementById
'test'
).
textContent
);
else
// something went wrong
var
client
new
XMLHttpRequest
();
client
onload
handler
client
open
"GET"
"unicorn.xml"
);
client
send
();
If you just want to log a message to the server:
function
log
message
var
client
new
XMLHttpRequest
();
client
open
"POST"
"/log"
);
client
setRequestHeader
"Content-Type"
"text/plain;charset=UTF-8"
);
client
send
message
);
Or if you want to check the status of a document on the server:
function
fetchStatus
address
var
client
new
XMLHttpRequest
();
client
onload
function
()
// in case of network errors this might not give reliable results
returnStatus
this
status
);
client
open
"HEAD"
address
);
client
send
();
1.1.
Specification history
The
XMLHttpRequest
object was initially defined as part of
the WHATWG’s HTML effort. (Based on Microsoft’s implementation many years prior.)
It moved to the W3C in 2006. Extensions (e.g., progress events and
cross-origin requests) to
XMLHttpRequest
were developed in a
separate draft (XMLHttpRequest Level 2) until end of 2011, at which point
the two drafts were merged and
XMLHttpRequest
became a single
entity again from a standards perspective. End of 2012 it moved back to the
WHATWG.
Discussion that led to the current draft can be found in the following mailing list
archives:
whatwg@whatwg.org
public-webapps@w3.org
public-webapi@w3.org
public-appformats@w3.org
2.
Terminology
This specification depends on the Infra Standard.
[INFRA]
This specification uses terminology from DOM, DOM Parsing and Serialization, Encoding,
Fetch, File API, HTML, URL, Web IDL, and XML.
[DOM]
[DOM-PARSING]
[ENCODING]
[FETCH]
[FILEAPI]
[HTML]
[URL]
[WEBIDL]
[XML]
[XML-NAMES]
3.
Interface
XMLHttpRequest
Exposed
=(
Window
DedicatedWorker
SharedWorker
)]
interface
XMLHttpRequestEventTarget
EventTarget
// event handlers
attribute
EventHandler
onloadstart
attribute
EventHandler
onprogress
attribute
EventHandler
onabort
attribute
EventHandler
onerror
attribute
EventHandler
onload
attribute
EventHandler
ontimeout
attribute
EventHandler
onloadend
};
Exposed
=(
Window
DedicatedWorker
SharedWorker
)]
interface
XMLHttpRequestUpload
XMLHttpRequestEventTarget
};
enum
XMLHttpRequestResponseType
""
"arraybuffer"
"blob"
"document"
"json"
"text"
};
Exposed
=(
Window
DedicatedWorker
SharedWorker
)]
interface
XMLHttpRequest
XMLHttpRequestEventTarget
constructor
();
// event handler
attribute
EventHandler
onreadystatechange
// states
const
unsigned
short
UNSENT
= 0;
const
unsigned
short
OPENED
= 1;
const
unsigned
short
HEADERS_RECEIVED
= 2;
const
unsigned
short
LOADING
= 3;
const
unsigned
short
DONE
= 4;
readonly
attribute
unsigned
short
readyState
// request
undefined
open
ByteString
method
USVString
url
);
undefined
open
ByteString
method
USVString
url
boolean
async
optional
USVString
username
null
optional
USVString
password
null
);
undefined
setRequestHeader
ByteString
name
ByteString
value
);
attribute
unsigned
long
timeout
attribute
boolean
withCredentials
SameObject
readonly
attribute
XMLHttpRequestUpload
upload
undefined
send
optional
Document
or
XMLHttpRequestBodyInit
)?
body
null
);
undefined
abort
();
// response
readonly
attribute
USVString
responseURL
readonly
attribute
unsigned
short
status
readonly
attribute
ByteString
statusText
ByteString
getResponseHeader
ByteString
name
);
ByteString
getAllResponseHeaders
();
undefined
overrideMimeType
DOMString
mime
);
attribute
XMLHttpRequestResponseType
responseType
readonly
attribute
any
response
readonly
attribute
USVString
responseText
Exposed
Window
readonly
attribute
Document
responseXML
};
An
XMLHttpRequest
object has an associated:
upload object
An
XMLHttpRequestUpload
object.
state
One of
unsent
opened
headers received
loading
, and
done
initially
unsent
send()
flag
A flag, initially unset.
timeout
An unsigned integer, initially 0.
cross-origin credentials
A boolean, initially false.
request method
method
request URL
URL
author request headers
header list
, initially empty.
request body
Initially null.
synchronous flag
A flag, initially unset.
upload complete flag
A flag, initially unset.
upload listener flag
A flag, initially unset.
timed out flag
A flag, initially unset.
response
response
, initially a
network error
received bytes
byte sequence
, initially the empty byte sequence.
response type
One of the empty string, "
arraybuffer
", "
blob
",
document
", "
json
", and "
text
"; initially the empty string.
response object
An object, failure, or null, initially null.
fetch controller
fetch controller
, initially a new
fetch controller
The
send()
method sets it to a useful
fetch controller
, but for simplicity it always holds a
fetch controller
override MIME type
MIME type
or null, initially null.
Can get a value when
overrideMimeType()
is invoked.
3.1.
Constructors
client
= new
XMLHttpRequest()
Returns a new
XMLHttpRequest
object.
The
new XMLHttpRequest()
constructor steps are:
Set
this
’s
upload object
to a
new
XMLHttpRequestUpload
object.
3.2.
Garbage collection
An
XMLHttpRequest
object must not be garbage collected if its
state
is either
opened
with the
send()
flag
set,
headers received
, or
loading
, and it has one or more
event listeners
registered whose
type
is one of
readystatechange
progress
abort
error
load
timeout
, and
loadend
If an
XMLHttpRequest
object is garbage collected while its connection is still open, the user
agent must
terminate
the
XMLHttpRequest
object’s
fetch controller
3.3.
Event handlers
The following are the
event handlers
(and their corresponding
event handler event types
that must be supported on objects implementing an interface that inherits
from
XMLHttpRequestEventTarget
as attributes:
event handler
event handler event type
onloadstart
loadstart
onprogress
progress
onabort
abort
onerror
error
onload
load
ontimeout
timeout
onloadend
loadend
The following is the
event handler
(and its corresponding
event handler event type
) that must be
supported as attribute solely by the
XMLHttpRequest
object:
event handler
event handler event type
onreadystatechange
readystatechange
3.4.
States
client
readyState
Returns
client
’s
state
The
readyState
getter steps are to return
the value from the table below in the cell of the second column, from the row where the value in the
cell in the first column is
this
’s
state
unsent
UNSENT
(numeric value 0)
The object has been constructed.
opened
OPENED
(numeric value 1)
The
open()
method has
been successfully invoked. During this state request headers can be set using
setRequestHeader()
and the fetch can be initiated using the
send()
method.
headers received
HEADERS_RECEIVED
(numeric value 2)
All redirects (if any) have been followed and all headers of a response have been received.
loading
LOADING
(numeric value 3)
The response body is being received.
done
DONE
(numeric value 4)
The data transfer has been completed or something went wrong during the transfer (e.g.,
infinite redirects).
3.5.
Request
Registering one or more event listeners on an
XMLHttpRequestUpload
object will result in a
CORS-preflight request
. (That is because
registering an event listener causes the
upload listener flag
to be set, which in turn causes
the
use-CORS-preflight flag
to be set.)
3.5.1.
The
open()
method
client
open(
method
url
[,
async
= true [,
username
= null [,
password
= null]]])
Sets the
request method
request URL
, and
synchronous flag
Throws a "
SyntaxError
DOMException
if either
method
is not a
valid method or
url
cannot be parsed.
Throws a "
SecurityError
DOMException
if
method
is a
case-insensitive match for `
CONNECT
`, `
TRACE
`, or `
TRACK
`.
Throws an "
InvalidAccessError
DOMException
if
async
is false,
the
current global object
is a
Window
object, and the
timeout
attribute is not zero or the
responseType
attribute is not the empty string.
Synchronous
XMLHttpRequest
outside of workers is in the
process of being removed from the web platform as it has detrimental effects to the end user’s
experience. (This is a long process that takes many years.) Developers must not pass false for the
async
argument when the
current global object
is a
Window
object. User agents
are strongly encouraged to warn about such usage in developer tools and may experiment with
throwing
an "
InvalidAccessError
DOMException
when it occurs.
The
open(
method
url
and
open(
method
url
async
username
password
method steps are:
If
this
’s
relevant global object
is a
Window
object and its
associated
Document
is not
fully active
, then
throw
an
InvalidStateError
DOMException
If
method
is not a
method
, then
throw
SyntaxError
DOMException
If
method
is a
forbidden method
, then
throw
SecurityError
DOMException
Normalize
method
Let
parsedURL
be the result of
encoding-parsing a URL
url
, relative to
this
’s
relevant settings object
If
parsedURL
is failure, then
throw
a "
SyntaxError
DOMException
If the
async
argument is omitted, set
async
to true, and set
username
and
password
to null.
Unfortunately legacy content prevents treating the
async
argument being
undefined
identical from it being omitted.
If
parsedURL
’s
host
is non-null, then:
If the
username
argument is not null,
set the username
given
parsedURL
and
username
If the
password
argument is not null,
set the password
given
parsedURL
and
password
If
async
is false, the
current global object
is a
Window
object, and
either
this
’s
timeout
is not 0 or
this
’s
response type
is not
the empty string, then
throw
an "
InvalidAccessError
DOMException
Terminate
this
’s
fetch controller
fetch
can be ongoing at this point.
Set variables associated with the object as follows:
Unset
this
’s
send()
flag
Set
this
’s
request method
to
method
Set
this
’s
request URL
to
parsedURL
Empty
this
’s
author request headers
Set
this
’s
request body
to null.
Set
this
’s
synchronous flag
if
async
is false; otherwise unset
this
’s
synchronous flag
Unset
this
’s
upload listener flag
Set
this
’s
response
to a
network error
Set
this
’s
received bytes
to the empty byte sequence.
Set
this
’s
response object
to null.
Override MIME type
is not overridden here as the
overrideMimeType()
method can be invoked before the
open()
method.
If
this
’s
state
is not
opened
, then:
Set
this
’s
state
to
opened
Fire an event
named
readystatechange
at
this
The reason there are two
open()
methods defined is due to a limitation of
the editing software used to write the XMLHttpRequest Standard.
3.5.2.
The
setRequestHeader()
method
client
setRequestHeader(
name
value
Appends a value to an existing request header or adds a new request header.
Throws an "
InvalidStateError
DOMException
if either
state
is not
opened
or the
send()
flag
is set.
Throws a "
SyntaxError
DOMException
if
name
is not a header name
or if
value
is not a header value.
The
setRequestHeader(
name
value
method must run these steps:
If
this
’s
state
is not
opened
, then
throw
an
InvalidStateError
DOMException
If
this
’s
send()
flag
is set, then
throw
an
InvalidStateError
DOMException
Normalize
value
If
name
is not a
header name
or
value
is not a
header value
, then
throw
a "
SyntaxError
DOMException
An empty byte sequence represents an empty
header value
If (
name
value
) is a
forbidden request-header
, then return.
Combine
name
value
) in
this
’s
author request headers
Some simple code demonstrating what happens when setting the same
header twice:
// The following script:
var
client
new
XMLHttpRequest
();
client
open
'GET'
'demo.cgi'
);
client
setRequestHeader
'X-Test'
'one'
);
client
setRequestHeader
'X-Test'
'two'
);
client
send
();
// …results in the following header being sent:
// X-Test: one, two
3.5.3.
The
timeout
getter and setter
client
timeout
Can be set to a time in milliseconds. When set to a non-zero value will cause
fetching
to terminate after the given time has passed. When the time has passed, the
request has not yet completed, and
this
’s
synchronous flag
is unset, a
timeout
event will then be
dispatched
, or a
TimeoutError
DOMException
will be
thrown
otherwise (for the
send()
method).
When set: throws an "
InvalidAccessError
DOMException
if the
synchronous flag
is set and the
current global object
is a
Window
object.
The
timeout
getter steps are to return
this
’s
timeout
The
timeout
setter steps are:
If the
current global object
is a
Window
object and
this
’s
synchronous flag
is set, then
throw
an "
InvalidAccessError
DOMException
Set
this
’s
timeout
to the given value.
This implies that the
timeout
attribute can be
set while
fetching
is in
progress. If that occurs it will still be measured relative to the start
of
fetching
3.5.4.
The
withCredentials
getter and setter
client
withCredentials
True when
credentials
are to be included in a cross-origin request. False when they are
to be excluded in a cross-origin request and when cookies are to be ignored in its response.
Initially false.
When set: throws an "
InvalidStateError
DOMException
if
state
is not
unsent
or
opened
, or if the
send()
flag
is set.
The
withCredentials
getter steps are to
return
this
’s
cross-origin credentials
The
withCredentials
setter steps are:
If
this
’s
state
is not
unsent
or
opened
, then
throw
an
InvalidStateError
DOMException
If
this
’s
send()
flag
is set, then
throw
an
InvalidStateError
DOMException
Set
this
’s
cross-origin credentials
to the given value.
3.5.5.
The
upload
getter
client
upload
Returns the associated
XMLHttpRequestUpload
object. It can be used to gather transmission information when data is
transferred to a server.
The
upload
getter steps are to return
this
’s
upload object
3.5.6.
The
send()
method
client
send([
body
= null])
Initiates the request. The
body
argument provides the
request body
, if any,
and is ignored if the
request method
is
GET
or
HEAD
Throws an "
InvalidStateError
DOMException
if either
state
is not
opened
or the
send()
flag
is set.
The
send(
body
method steps are:
If
this
’s
state
is not
opened
, then
throw
an
InvalidStateError
DOMException
If
this
’s
send()
flag
is set, then
throw
an
InvalidStateError
DOMException
If
this
’s
request method
is `
GET
` or `
HEAD
`, then
set
body
to null.
If
body
is not null, then:
Let
extractedContentType
be null.
If
body
is a
Document
, then set
this
’s
request body
to
body
serialized
converted
, and
UTF-8 encoded
Otherwise:
Let
bodyWithType
be the result of
safely extracting
body
Set
this
’s
request body
to
bodyWithType
’s
body
Set
extractedContentType
to
bodyWithType
’s
type
Let
originalAuthorContentType
be the result of
getting
Content-Type
` from
this
’s
author request headers
If
originalAuthorContentType
is non-null, then:
If
body
is a
Document
or a
USVString
, then:
Let
contentTypeRecord
be the result of
parsing
originalAuthorContentType
If
contentTypeRecord
is not failure,
contentTypeRecord
’s
parameters
["
charset
"]
exists
, and
parameters
["
charset
"] is not an
ASCII case-insensitive
match for "
UTF-8
", then:
Set
contentTypeRecord
’s
parameters
["
charset
"] to "
UTF-8
".
Let
newContentTypeSerialized
be the result of
serializing
contentTypeRecord
Set
(`
Content-Type
`,
newContentTypeSerialized
) in
this
’s
author request headers
Otherwise:
If
body
is an
HTML document
, then
set
(`
Content-Type
`, `
text/html;charset=UTF-8
`) in
this
’s
author request headers
Otherwise, if
body
is an
XML document
set
(`
Content-Type
`, `
application/xml;charset=UTF-8
`) in
this
’s
author request headers
Otherwise, if
extractedContentType
is not null,
set
(`
Content-Type
`,
extractedContentType
) in
this
’s
author request headers
If one or more event listeners are registered on
this
’s
upload object
, then
set
this
’s
upload listener flag
Let
req
be a new
request
, initialized as
follows:
method
This
’s
request method
URL
This
’s
request URL
header list
This
’s
author request headers
unsafe-request flag
Set.
body
This
’s
request body
client
This
’s
relevant settings object
mode
cors
".
use-CORS-preflight flag
Set if
this
’s
upload listener flag
is set.
credentials mode
If
this
’s
cross-origin credentials
is true, then "
include
";
otherwise "
same-origin
".
use-URL-credentials flag
Set if
this
’s
request URL
includes credentials
initiator type
xmlhttprequest
".
Unset
this
’s
upload complete flag
Unset
this
’s
timed out flag
If
req
’s
body
is null, then set
this
’s
upload complete flag
Set
this
’s
send()
flag
If
this
’s
synchronous flag
is unset, then:
Fire a progress event
named
loadstart
at
this
with 0 and 0.
Let
requestBodyTransmitted
be 0.
Let
requestBodyLength
be
req
’s
body
’s
length
, if
req
’s
body
is non-null; otherwise 0.
Assert:
requestBodyLength
is an integer.
If
this
’s
upload complete flag
is unset and
this
’s
upload listener flag
is set, then
fire a progress event
named
loadstart
at
this
’s
upload object
with
requestBodyTransmitted
and
requestBodyLength
If
this
’s
state
is not
opened
or
this
’s
send()
flag
is unset, then return.
Let
processRequestBodyChunkLength
, given a
bytesLength
, be these steps:
Increase
requestBodyTransmitted
by
bytesLength
If not roughly 50ms have passed since these steps were last invoked, then return.
If
this
’s
upload listener flag
is set, then
fire a progress event
named
progress
at
this
’s
upload object
with
requestBodyTransmitted
and
requestBodyLength
These steps are only invoked when new bytes are transmitted.
Let
processRequestEndOfBody
be these steps:
Set
this
’s
upload complete flag
If
this
’s
upload listener flag
is unset, then return.
Fire a progress event
named
progress
at
this
’s
upload object
with
requestBodyTransmitted
and
requestBodyLength
Fire a progress event
named
load
at
this
’s
upload object
with
requestBodyTransmitted
and
requestBodyLength
Fire a progress event
named
loadend
at
this
’s
upload object
with
requestBodyTransmitted
and
requestBodyLength
Let
processResponse
, given a
response
, be these steps:
Set
this
’s
response
to
response
Handle errors
for
this
If
this
’s
response
is a
network error
, then
return.
Set
this
’s
state
to
headers received
Fire an event
named
readystatechange
at
this
If
this
’s
state
is not
headers received
, then return.
If
this
’s
response
’s
body
is null,
then run
handle response end-of-body
for
this
and return.
Let
length
be the result of
extracting a length
from
this
’s
response
’s
header list
If
length
is not an integer, then set it to 0.
Let
processBodyChunk
given
bytes
be these steps:
Append
bytes
to
this
’s
received bytes
If not roughly 50ms have passed since these steps were last invoked, then return.
If
this
’s
state
is
headers received
, then set
this
’s
state
to
loading
Fire an event
named
readystatechange
at
this
Web compatibility is the reason
readystatechange
fires more often than
this
’s
state
changes.
Fire a progress event
named
progress
at
this
with
this
’s
received bytes
’s
length
and
length
Let
processEndOfBody
be this step: run
handle response end-of-body
for
this
Let
processBodyError
be these steps:
Set
this
’s
response
to a
network error
Run
handle errors
for
this
Incrementally read
this
’s
response
’s
body
, given
processBodyChunk
processEndOfBody
processBodyError
, and
this
’s
relevant global object
Set
this
’s
fetch controller
to the result of
fetching
req
with
processRequestBodyChunkLength
set to
processRequestBodyChunkLength
processRequestEndOfBody
set to
processRequestEndOfBody
, and
processResponse
set to
processResponse
Let
now
be the present time.
Run these steps
in parallel
Wait until either
req
’s
done flag
is set or
this
’s
timeout
is not 0 and
this
’s
timeout
milliseconds have passed since
now
If
req
’s
done flag
is unset, then set
this
’s
timed out flag
and
terminate
this
’s
fetch controller
Otherwise, if
this
’s
synchronous flag
is set:
Let
processedResponse
be false.
Let
processResponseConsumeBody
, given a
response
and
nullOrFailureOrBytes
, be these steps:
If
nullOrFailureOrBytes
is not failure, then set
this
’s
response
to
response
If
nullOrFailureOrBytes
is a
byte sequence
, then append
nullOrFailureOrBytes
to
this
’s
received bytes
Set
processedResponse
to true.
Set
this
’s
fetch controller
to the result of
fetching
req
with
processResponseConsumeBody
set to
processResponseConsumeBody
and
useParallelQueue
set to true.
Let
now
be the present time.
Pause
until either
processedResponse
is true or
this
’s
timeout
is not 0 and
this
’s
timeout
milliseconds have passed since
now
If
processedResponse
is false, then set
this
’s
timed out flag
and
terminate
this
’s
fetch controller
Report timing
for
this
’s
fetch controller
given the
current global object
Run
handle response end-of-body
for
this
To
handle response end-of-body
for an
XMLHttpRequest
object
xhr
, run these steps:
Handle errors
for
xhr
If
xhr
’s
response
is a
network error
, then
return.
Let
transmitted
be
xhr
’s
received bytes
’s
length
Let
length
be the result of
extracting a length
from
this
’s
response
’s
header list
If
length
is not an integer, then set it to 0.
If
xhr
’s
synchronous flag
is unset, then
fire a progress event
named
progress
at
xhr
with
transmitted
and
length
Set
xhr
’s
state
to
done
Unset
xhr
’s
send()
flag
Fire an event
named
readystatechange
at
xhr
Fire a progress event
named
load
at
xhr
with
transmitted
and
length
Fire a progress event
named
loadend
at
xhr
with
transmitted
and
length
To
handle errors
for an
XMLHttpRequest
object
xhr
, run these steps:
If
xhr
’s
send()
flag
is unset, then return.
If
xhr
’s
timed out flag
is set, then run the
request error steps
for
xhr
timeout
, and "
TimeoutError
DOMException
Otherwise, if
xhr
’s
response
’s
aborted flag
is set, run the
request error steps
for
xhr
abort
, and "
AbortError
DOMException
Otherwise, if
xhr
’s
response
is a
network error
, then run the
request error steps
for
xhr
error
, and "
NetworkError
DOMException
The
request error steps
for an
XMLHttpRequest
object
xhr
event
, and optionally
exception
are:
Set
xhr
’s
state
to
done
Unset
xhr
’s
send()
flag
Set
xhr
’s
response
to a
network error
If
xhr
’s
synchronous flag
is set, then
throw
exception
Fire an event
named
readystatechange
at
xhr
At this point it is clear that
xhr
’s
synchronous flag
is unset.
If
xhr
’s
upload complete flag
is unset, then:
Set
xhr
’s
upload complete flag
If
xhr
’s
upload listener flag
is set, then:
Fire a progress event
named
event
at
xhr
’s
upload object
with 0 and 0.
Fire a progress event
named
loadend
at
xhr
’s
upload object
with 0 and 0.
Fire a progress event
named
event
at
xhr
with 0 and 0.
Fire a progress event
named
loadend
at
xhr
with 0 and 0.
3.5.7.
The
abort()
method
client
abort()
Cancels any network activity.
The
abort()
method steps are:
Abort
this
’s
fetch controller
If
this
’s
state
is
opened
with
this
’s
send()
flag
set,
headers received
, or
loading
, then run the
request error steps
for
this
and
abort
If
this
’s
state
is
done
, then set
this
’s
state
to
unsent
and
this
’s
response
to a
network error
No
readystatechange
event is dispatched.
3.6.
Response
3.6.1.
The
responseURL
getter
The
responseURL
getter steps are to return
the empty string if
this
’s
response
’s
URL
is
null; otherwise its
serialization
with the
exclude fragment flag
set.
3.6.2.
The
status
getter
The
status
getter steps are to return
this
’s
response
’s
status
3.6.3.
The
statusText
getter
The
statusText
getter steps are to return
this
’s
response
’s
status message
3.6.4.
The
getResponseHeader()
method
The
getResponseHeader(
name
method
steps are to return the result of
getting
name
from
this
’s
response
’s
header list
The Fetch Standard filters
this
’s
response
’s
header list
[FETCH]
For the following script:
var
client
new
XMLHttpRequest
();
client
open
"GET"
"unicorns-are-awesome.txt"
true
);
client
send
();
client
onreadystatechange
function
()
if
this
readyState
==
this
HEADERS_RECEIVED
client
getResponseHeader
"Content-Type"
));
The
print()
function will get to process something like:
text/plain; charset=UTF-8
3.6.5.
The
getAllResponseHeaders()
method
byte sequence
is
legacy-uppercased-byte less than
byte sequence
if the following steps return true:
Let
be
byte-uppercased
Let
be
byte-uppercased
Return
is
byte less than
The
getAllResponseHeaders()
method steps are:
Let
output
be an empty byte sequence.
Let
initialHeaders
be the result of running
sort and combine
with
this
’s
response
’s
header list
Let
headers
be the result of
sorting
initialHeaders
in
ascending order, with
being less than
if
’s
name
is
legacy-uppercased-byte less than
’s
name
Unfortunately, this is needed for compatibility with deployed content.
For each
header
in
headers
, append
header
’s
name
, followed by a 0x3A 0x20 byte pair, followed by
header
’s
value
, followed by a 0x0D 0x0A byte pair, to
output
Return
output
The Fetch Standard filters
this
’s
response
’s
header list
[FETCH]
For the following script:
var
client
new
XMLHttpRequest
();
client
open
"GET"
"narwhals-too.txt"
true
);
client
send
();
client
onreadystatechange
function
()
if
this
readyState
==
this
HEADERS_RECEIVED
this
getAllResponseHeaders
());
The
print()
function will get to process something
like:
connection: Keep-Alive
content-type: text/plain; charset=utf-8
date: Sun, 24 Oct 2004 04:58:38 GMT
keep-alive: timeout=15, max=99
server: Apache/1.3.31 (Unix)
transfer-encoding: chunked
3.6.6.
Response body
To
get a response MIME type
for an
XMLHttpRequest
object
xhr
, run these steps:
Let
mimeType
be the result of
extracting a MIME type
from
xhr
’s
response
’s
header list
If
mimeType
is failure, then set
mimeType
to
text/xml
Return
mimeType
To
get a final MIME type
for an
XMLHttpRequest
object
xhr
, run these steps:
If
xhr
’s
override MIME type
is null, return the result of
get a response MIME type
for
xhr
Return
xhr
’s
override MIME type
To
get a final encoding
for an
XMLHttpRequest
object
xhr
, run these steps:
Let
label
be null.
Let
responseMIME
be the result of
get a response MIME type
for
xhr
If
responseMIME
’s
parameters
["
charset
"]
exists
, then set
label
to it.
If
xhr
’s
override MIME type
’s
parameters
["
charset
"]
exists
, then set
label
to it.
If
label
is null, then return null.
Let
encoding
be the result of
getting an encoding
from
label
If
encoding
is failure, then return null.
Return
encoding
The above steps intentionally do not use the
get a final MIME type
as it would
not be web compatible.
To
set a document response
for an
XMLHttpRequest
object
xhr
, run these steps:
If
xhr
’s
response
’s
body
is null,
then return.
Let
finalMIME
be the result of
get a final MIME type
for
xhr
If
finalMIME
is not an
HTML MIME type
or an
XML MIME type
, then
return.
If
xhr
’s
response type
is the empty string and
finalMIME
is an
HTML MIME type
, then return.
This is restricted to
xhr
’s
response type
being
document
" in order to prevent breaking legacy content.
If
finalMIME
is an
HTML MIME type
, then:
Let
charset
be the result of
get a final encoding
for
xhr
If
charset
is null,
prescan
the first 1024 bytes of
xhr
’s
received bytes
and if
that does not terminate unsuccessfully then let
charset
be
the return value.
If
charset
is null, then set
charset
to
UTF-8
Let
document
be a
document
that
represents the result parsing
xhr
’s
received bytes
following the rules set
forth in the HTML Standard for an HTML parser with scripting disabled and
a known definite encoding
charset
[HTML]
Flag
document
as an
HTML document
Otherwise, let
document
be a
document
that represents the result of
running the
XML parser
with
XML scripting support disabled
on
xhr
’s
received bytes
. If that fails (unsupported character encoding,
namespace well-formedness error, etc.), then return null.
[HTML]
Resources referenced will not be loaded and no associated XSLT will be
applied.
If
charset
is null, then set
charset
to
UTF-8
Set
document
’s
encoding
to
charset
Set
document
’s
content type
to
finalMIME
Set
document
’s
URL
to
xhr
’s
response
’s
URL
Set
document
’s
origin
to
xhr
’s
relevant settings object
’s
origin
Set
xhr
’s
response object
to
document
To
get a text response
for an
XMLHttpRequest
object
xhr
, run these steps:
If
xhr
’s
response
’s
body
is null,
then return the empty string.
Let
charset
be the result of
get a final encoding
for
xhr
If
xhr
’s
response type
is the empty string,
charset
is null, and
the result of
get a final MIME type
for
xhr
is an
XML MIME type
, then use
the rules set forth in the XML specifications to determine the encoding. Let
charset
be
the determined encoding.
[XML]
[XML-NAMES]
This is restricted to
xhr
’s
response type
being the empty string
to keep the non-legacy
response type
value "
text
" simple.
If
charset
is null, then set
charset
to
UTF-8
Return the result of running
decode
on
xhr
’s
received bytes
using
fallback encoding
charset
Authors are strongly encouraged to always encode their resources using
UTF-8
3.6.7.
The
overrideMimeType()
method
client
overrideMimeType(
mime
Acts as if the `
Content-Type
` header value for a response is
mime
. (It
does not change the header.)
Throws an "
InvalidStateError
DOMException
if
state
is
loading
or
done
The
overrideMimeType(
mime
method
steps are:
If
this
’s
state
is
loading
or
done
, then
throw
an
InvalidStateError
DOMException
Set
this
’s
override MIME type
to the result of
parsing
mime
If
this
’s
override MIME type
is failure, then set
this
’s
override MIME type
to
application/octet-stream
3.6.8.
The
responseType
getter and setter
client
responseType
[ =
value
Returns the response type.
Can be set to change the response type. Values are:
the empty string (default),
arraybuffer
",
blob
",
document
",
json
", and
text
".
When set: setting to "
document
" is ignored if the
current global object
is
not a
Window
object.
When set: throws an "
InvalidStateError
DOMException
if
state
is
loading
or
done
When set: throws an "
InvalidAccessError
DOMException
if the
synchronous flag
is set and the
current global object
is a
Window
object.
The
responseType
getter steps are to return
this
’s
response type
The
responseType
setter steps are:
If the
current global object
is not a
Window
object and the given value is
document
", then return.
If
this
’s
state
is
loading
or
done
, then
throw
an
InvalidStateError
DOMException
If the
current global object
is a
Window
object and
this
’s
synchronous flag
is set, then
throw
an "
InvalidAccessError
DOMException
Set
this
’s
response type
to the given value.
3.6.9.
The
response
getter
client
response
Returns the response body.
The
response
getter steps are:
If
this
’s
response type
is the empty string or "
text
", then:
If
this
’s
state
is not
loading
or
done
, then return
the empty string.
Return the result of
getting a text response
for
this
If
this
’s
state
is not
done
, then return null.
If
this
’s
response object
is failure, then return null.
If
this
’s
response object
is non-null, then return it.
If
this
’s
response type
is "
arraybuffer
", then set
this
’s
response object
to a
new
ArrayBuffer
object representing
this
’s
received bytes
. If this throws an exception, then set
this
’s
response object
to failure and return null.
Allocating an
ArrayBuffer
object is not guaranteed to succeed.
[ECMASCRIPT]
Otherwise, if
this
’s
response type
is "
blob
",
set
this
’s
response object
to a
new
Blob
object representing
this
’s
received bytes
with
type
set to the result of
get a final MIME type
for
this
Otherwise, if
this
’s
response type
is "
document
",
set a document response
for
this
Otherwise:
Assert:
this
’s
response type
is "
json
".
If
this
’s
response
’s
body
is null,
then return null.
Let
jsonObject
be the result of running
parse JSON from bytes
on
this
’s
received bytes
. If that threw an exception, then return null.
Set
this
’s
response object
to
jsonObject
Return
this
’s
response object
3.6.10.
The
responseText
getter
client
responseText
Returns response as text.
Throws an "
InvalidStateError
DOMException
if
responseType
is not the empty string or "
text
".
The
responseText
getter steps are:
If
this
’s
response type
is not the empty string or "
text
", then
throw
an "
InvalidStateError
DOMException
If
this
’s
state
is not
loading
or
done
, then return
the empty string.
Return the result of
getting a text response
for
this
3.6.11.
The
responseXML
getter
client
responseXML
Returns the response as document.
Throws an "
InvalidStateError
DOMException
if
responseType
is not the empty string or "
document
".
The
responseXML
getter steps are:
If
this
’s
response type
is not the empty string or "
document
",
then
throw
an "
InvalidStateError
DOMException
If
this
’s
state
is not
done
, then return null.
Assert:
this
’s
response object
is not failure.
If
this
’s
response object
is non-null, then return it.
Set a document response
for
this
Return
this
’s
response object
3.7.
Events summary
This section is non-normative.
The following events are dispatched on
XMLHttpRequest
or
XMLHttpRequestUpload
objects:
Event name
Interface
Dispatched when…
readystatechange
Event
The
readyState
attribute changes
value, except when it changes to
UNSENT
loadstart
ProgressEvent
The fetch initiates.
progress
ProgressEvent
Transmitting data.
abort
ProgressEvent
When the fetch has been aborted. For instance, by invoking the
abort()
method.
error
ProgressEvent
The fetch failed.
load
ProgressEvent
The fetch succeeded.
timeout
ProgressEvent
The author specified timeout has passed before the fetch completed.
loadend
ProgressEvent
The fetch completed (success or failure).
4.
Interface
FormData
typedef
File
or
USVString
FormDataEntryValue
Exposed
=(
Window
Worker
)]
interface
FormData
constructor
optional
HTMLFormElement
form
optional
HTMLElement
submitter
null
);
undefined
append
USVString
name
USVString
value
);
undefined
append
USVString
name
Blob
blobValue
optional
USVString
filename
);
undefined
delete
USVString
name
);
FormDataEntryValue
get
USVString
name
);
sequence
FormDataEntryValue
getAll
USVString
name
);
boolean
has
USVString
name
);
undefined
set
USVString
name
USVString
value
);
undefined
set
USVString
name
Blob
blobValue
optional
USVString
filename
);
iterable
USVString
FormDataEntryValue
>;
};
Each
FormData
object has an associated
entry list
(an
entry list
). It is initially empty.
This section used to define
entry
, an entry’s
name
and
value
, and the
create an entry
algorithm. These definitions have been
moved to the HTML Standard.
[HTML]
The
new FormData(
form
submitter
constructor steps are:
If
form
is given, then:
If
submitter
is non-null, then:
If
submitter
is not a
submit button
, then
throw
TypeError
If
submitter
’s
form owner
is not
form
, then
throw
NotFoundError
DOMException
Let
list
be the result of
constructing the entry list
for
form
and
submitter
If
list
is null, then
throw
an "
InvalidStateError
DOMException
Set
this
’s
entry list
to
list
The
append(
name
value
and
append(
name
blobValue
filename
method steps are:
Let
value
be
value
if given; otherwise
blobValue
Let
entry
be the result of
creating an entry
with
name
value
, and
filename
if given.
Append
entry
to
this
’s
entry list
The reason there is an argument named
value
as well as
blobValue
is due to a limitation of the editing software used to write the XMLHttpRequest Standard.
The
delete(
name
method steps are to
remove
all
entries
whose
name
is
name
from
this
’s
entry list
The
get(
name
method
steps are:
If there is no
entry
whose
name
is
name
in
this
’s
entry list
, then return null.
Return the
value
of the first
entry
whose
name
is
name
from
this
’s
entry list
The
getAll(
name
method steps are:
If there is no
entry
whose
name
is
name
in
this
’s
entry list
, then return the empty list.
Return the
values
of all
entries
whose
name
is
name
, in order, from
this
’s
entry list
The
has(
name
method
steps are to return true if there is an
entry
whose
name
is
name
in
this
’s
entry list
; otherwise false.
The
set(
name
value
and
set(
name
blobValue
filename
method steps are:
Let
value
be
value
if given; otherwise
blobValue
Let
entry
be the result of
creating an entry
with
name
value
, and
filename
if given.
If there are
entries
in
this
’s
entry list
whose
name
is
name
, then
replace
the first
such
entry
with
entry
and
remove
the others.
Otherwise,
append
entry
to
this
’s
entry list
The reason there is an argument named
value
as well as
blobValue
is due to a limitation of the editing software used to write the XMLHttpRequest Standard.
The
value pairs to iterate over
are
this
’s
entry list
’s
entries
with the key being the
name
and the
value being the
value
5.
Interface
ProgressEvent
Exposed
=(
Window
Worker
)]
interface
ProgressEvent
Event
constructor
DOMString
type
optional
ProgressEventInit
eventInitDict
= {});
readonly
attribute
boolean
lengthComputable
readonly
attribute
double
loaded
readonly
attribute
double
total
};
dictionary
ProgressEventInit
EventInit
boolean
lengthComputable
false
double
loaded
= 0;
double
total
= 0;
};
Events
using the
ProgressEvent
interface indicate some kind of progression.
The
lengthComputable
loaded
, and
total
getter steps are to return the value they were initialized to.
5.1.
Firing events using the
ProgressEvent
interface
To
fire a progress event
named
at
target
, given
transmitted
and
length
, means to
fire an event
named
at
target
, using
ProgressEvent
, with the
loaded
attribute initialized to
transmitted
, and if
length
is not 0, with the
lengthComputable
attribute initialized to true and the
total
attribute initialized to
length
5.2.
Suggested names for events using the
ProgressEvent
interface
This section is non-normative.
The suggested
type
attribute values for use with
events
using the
ProgressEvent
interface are summarized in the table below.
Specification editors are free to tune the details to their specific
scenarios, though are strongly encouraged to discuss their usage with the
WHATWG community to ensure input from people familiar with the subject.
type
attribute value
Description
Times
When
loadstart
Progress has begun.
Once.
First.
progress
In progress.
Once or more.
After
loadstart
has been
dispatched
error
Progression failed.
Zero or once (mutually exclusive).
After the last
progress
has
been
dispatched
abort
Progression is terminated.
timeout
Progression is terminated due to preset time expiring.
load
Progression is successful.
loadend
Progress has stopped.
Once.
After one of
error
abort
timeout
or
load
has been
dispatched
The
error
abort
timeout
, and
load
event types are mutually exclusive.
Throughout the web platform the
error
abort
timeout
and
load
event types have
their
bubbles
and
cancelable
attributes initialized to false, so it is suggested that for consistency all
events
using the
ProgressEvent
interface do the same.
5.3.
Security considerations
For cross-origin requests some kind of opt-in, e.g., the
CORS protocol
defined in the Fetch Standard, has to be
used before
events
using the
ProgressEvent
interface are
dispatched
as information (e.g., size) would be revealed that cannot be obtained
otherwise.
[FETCH]
5.4.
Example
In this example
XMLHttpRequest
, combined with concepts
defined in the sections before, and the HTML
progress
element are used together to
display the process of
fetching
a resource.
title
Waiting for Magical Unicorns
title
progress
id
>progress
script
var
progressBar
document
getElementById
"p"
),
client
new
XMLHttpRequest
()
client
open
"GET"
"magical-unicorns"
client
onprogress
function
pe
if
pe
lengthComputable
progressBar
max
pe
total
progressBar
value
pe
loaded
client
onloadend
function
pe
progressBar
value
pe
loaded
client
send
()
script
Fully working code would of course be more elaborate and deal with more
scenarios, such as network errors or the end user terminating the request.
Acknowledgments
Thanks to
Addison Phillips,
Adrian Bateman,
Ahmed Kamel,
Alan Thomas,
Alex Hopmann,
Alex Vincent,
Alexey Proskuryakov,
Ali Alabbas,
Andrea Marchesini,
Asbjørn Ulsberg,
Bertrand Guay-Paquet,
Björn Höhrmann,
Boris Zbarsky,
Caitlin Potter,
Cameron McCormack,
白丞祐 (Cheng-You Bai),
Chris Marrin,
Christophe Jolif,
Charles McCathieNevile,
Chirag S Kumar,
Dan Winship,
David Andersson,
David Flanagan,
David Håsäther,
David Levin,
Dean Jackson,
Denis Sureau,
Domenic Denicola,
Dominik Röttsches,
Doug Schepers,
Douglas Livingstone,
Elliott Sprehn,
Elliotte Harold,
Eric Lawrence,
Eric Uhrhane,
Erik Arvidsson,
Erik Dahlström,
Feras Moussa,
Gideon Cohn,
Glenn Adams,
Gorm Haug Eriksen,
Gregory Terzian,
Håkon Wium Lie,
Hallvord R. M. Steen,
Henri Sivonen,
Hiroshige Hayashizaki,
Huub Schaeks,
Ian Clelland,
Ian Davis,
Ian Hickson,
Ivan Herman,
Jake Archibald,
Jared Jacobs,
Jarred Nicholls,
Jeff Walden,
Jens Lindström,
Jim Deegan,
Jim Ley,
Joe Farro,
Jonas Sicking,
Julian Reschke,
송정기 (Jungkee Song),
呂康豪 (Kang-Hao Lu),
Karl Dubost,
Keith Yeung,
田村健人 (Kent TAMURA),
Lachlan Hunt,
Maciej Stachowiak,
Magnus Kristiansen,
Manish Goregaokar,
Marc Hadley,
Marcos Caceres,
Mark Baker,
Mark Birbeck,
Mark Nottingham,
Mark S. Miller,
Martin Hassman,
Mike Pennisi,
Mohamed Zergaoui,
Ms2ger,
Noam Rosenthal,
Odin Hørthe Omdal,
Olli Pettay,
Pawel Glowacki,
Peter Michaux,
Philip Jägenstedt,
Philip Taylor,
Rashika Jaggi,
Robin Berjon,
Rune
F.
Halvorsen,
Ruud Steltenpool,
Ryo Onodera,
Sam Sneddon,
Sergiu Dumitriu,
Shivakumar Jagalur Matt,
Sigbjørn Finne,
Simon Pieters,
Stewart Brodie,
Sunava Dutta,
Takeshi Kurosawa,
Takeshi Yoshino,
Thomas Roessler,
Thomas Wisniewski,
Tom Magliery,
Travis Leithead,
triple-underscore,
Yaron Tausky,
Yehuda Katz,
Youenn Fablet, and
Zhenbin Xu
for their contributions to this standard.
Special thanks to the Microsoft employees who first implemented the
XMLHttpRequest
interface, which was first widely deployed by the
Windows Internet Explorer browser.
Special thanks to Ian Hickson for drafting an initial version of this specification in
the HTML Standard (then Web Applications 1.0).
[HTML]
Special thanks to the W3C SVG WG for drafting the original
ProgressEvent
class as part of the
SVG Micro DOM
This standard is written by
Anne van Kesteren
Apple
annevk@annevk.nl
).
Intellectual property rights
Copyright © WHATWG (Apple, Google, Mozilla, Microsoft). This work is licensed under a
Creative Commons Attribution 4.0
International License
. To the extent portions of it are incorporated into source code, such
portions in the source code are licensed under the
BSD 3-Clause License
instead.
This is the Living Standard. Those
interested in the patent-review version should view the
Living Standard Review Draft
Index
Terms defined by this specification
""
, in § 3
abort
, in § 3.7
abort()
, in § 3.5.7
append(name, blobValue)
, in § 4
append(name, blobValue, filename)
, in § 4
append(name, value)
, in § 4
"arraybuffer"
, in § 3
author request headers
, in § 3
"blob"
, in § 3
constructor()
constructor for FormData
, in § 4
constructor for XMLHttpRequest
, in § 3.1
constructor(form)
, in § 4
constructor(form, submitter)
, in § 4
constructor(type)
, in § 5
constructor(type, eventInitDict)
, in § 5
cross-origin credentials
, in § 3
delete(name)
, in § 4
"document"
, in § 3
DONE
, in § 3.4
entry list
, in § 4
error
, in § 3.7
fetch controller
, in § 3
fire a progress event
, in § 5.1
FormData
, in § 4
FormData()
, in § 4
FormDataEntryValue
, in § 4
FormData(form)
, in § 4
FormData(form, submitter)
, in § 4
get a final encoding
, in § 3.6.6
get a final MIME type
, in § 3.6.6
getAll(name)
, in § 4
getAllResponseHeaders()
, in § 3.6.5
get a response MIME type
, in § 3.6.6
get(name)
, in § 4
getResponseHeader(name)
, in § 3.6.4
getting a text response
, in § 3.6.6
handle errors
, in § 3.5.6
handle response end-of-body
, in § 3.5.6
has(name)
, in § 4
HEADERS_RECEIVED
, in § 3.4
"json"
, in § 3
legacy-uppercased-byte less than
, in § 3.6.5
lengthComputable
attribute for ProgressEvent
, in § 5
dict-member for ProgressEventInit
, in § 5
load
, in § 3.7
loaded
attribute for ProgressEvent
, in § 5
dict-member for ProgressEventInit
, in § 5
loadend
, in § 3.7
LOADING
, in § 3.4
loadstart
, in § 3.7
onabort
, in § 3.3
onerror
, in § 3.3
onload
, in § 3.3
onloadend
, in § 3.3
onloadstart
, in § 3.3
onprogress
, in § 3.3
onreadystatechange
, in § 3.3
ontimeout
, in § 3.3
OPENED
, in § 3.4
open(method, url)
, in § 3.5.1
open(method, url, async)
, in § 3.5.1
open(method, url, async, username)
, in § 3.5.1
open(method, url, async, username, password)
, in § 3.5.1
override MIME type
, in § 3
overrideMimeType(mime)
, in § 3.6.7
progress
, in § 3.7
ProgressEvent
, in § 5
ProgressEventInit
, in § 5
ProgressEvent(type)
, in § 5
ProgressEvent(type, eventInitDict)
, in § 5
readyState
, in § 3.4
readystatechange
, in § 3.7
received bytes
, in § 3
request body
, in § 3
request error steps
, in § 3.5.6
request method
, in § 3
request URL
, in § 3
response
attribute for XMLHttpRequest
, in § 3.6.9
dfn for XMLHttpRequest
, in § 3
response object
, in § 3
responseText
, in § 3.6.10
response type
, in § 3
responseType
, in § 3.6.8
responseURL
, in § 3.6.1
responseXML
, in § 3.6.11
send()
, in § 3.5.6
send(body)
, in § 3.5.6
send() flag
, in § 3
set a document response
, in § 3.6.6
set(name, blobValue)
, in § 4
set(name, blobValue, filename)
, in § 4
set(name, value)
, in § 4
setRequestHeader(name, value)
, in § 3.5.2
state
, in § 3
status
, in § 3.6.2
statusText
, in § 3.6.3
synchronous flag
, in § 3
"text"
, in § 3
timed out flag
, in § 3
timeout
attribute for XMLHttpRequest
, in § 3.5.3
definition of
, in § 3
event for XMLHttpRequestEventTarget
, in § 3.7
total
attribute for ProgressEvent
, in § 5
dict-member for ProgressEventInit
, in § 5
UNSENT
, in § 3.4
upload
, in § 3.5.5
upload complete flag
, in § 3
upload listener flag
, in § 3
upload object
, in § 3
withCredentials
, in § 3.5.4
XMLHttpRequest
, in § 3
XMLHttpRequest()
, in § 3.1
XMLHttpRequestEventTarget
, in § 3
XMLHttpRequestResponseType
, in § 3
XMLHttpRequestUpload
, in § 3
Terms defined by reference
[DOM]
defines the following terms:
Document
Event
EventInit
EventTarget
bubbles
cancelable
content type
dispatch
document
encoding
event listener
fire an event
HTML document
origin
type
URL
XML document
[ENCODING]
defines the following terms:
decode
getting an encoding
UTF-8
UTF-8 encode
[FETCH]
defines the following terms:
XMLHttpRequestBodyInit
abort
aborted flag
body
(for body with type)
body
(for request)
body
(for response)
client
combine
CORS protocol
CORS-preflight request
credentials
credentials mode
done flag
extracting a length
extracting a MIME type
fetch
fetch controller
forbidden method
forbidden request-header
get
header list
header list
(for request)
header list
(for response)
header name
header value
incrementally read
initiator type
length
method
method
(for request)
mode
name
network error
normalize
(for header value)
normalize
(for method)
processRequestBodyChunkLength
processRequestEndOfBody
processResponse
processResponseConsumeBody
report timing
request
response
safely extract
set
sort and combine
status
status message
terminate
type
unsafe-request flag
URL
(for request)
URL
(for response)
use-CORS-preflight flag
use-URL-credentials flag
useParallelQueue
value
[FILEAPI]
defines the following terms:
Blob
File
type
[HTML]
defines the following terms:
EventHandler
HTMLElement
HTMLFormElement
Window
a known definite encoding
associated Document
constructing the entry list
create an entry
current global object
encoding-parse a URL
entry
entry list
event handler
event handler event type
form owner
fragment serializing algorithm steps
fully active
in parallel
name
origin
pause
prescan a byte stream to determine its encoding
progress
relevant global object
relevant settings object
submit button
value
XML parser
XML scripting support disabled
[INFRA]
defines the following terms:
append
ASCII case-insensitive
byte less than
byte sequence
byte-uppercase
convert
empty
exist
for each
length
parse JSON from bytes
remove
replace
set
sorting
[MIMESNIFF]
defines the following terms:
HTML MIME type
MIME type
parameters
parse a MIME type
parse a MIME type from bytes
serialize a MIME type to bytes
XML MIME type
[URL]
defines the following terms:
host
includes credentials
set the password
set the username
URL
URL serializer
[WEBDRIVER-BIDI]
defines the following terms:
event
[WEBIDL]
defines the following terms:
AbortError
ArrayBuffer
ByteString
DOMException
DOMString
Exposed
InvalidAccessError
InvalidStateError
NetworkError
NotFoundError
SameObject
SecurityError
SyntaxError
TimeoutError
TypeError
USVString
any
boolean
double
new
sequence
this
throw
undefined
unsigned long
unsigned short
value pairs to iterate over
References
Normative References
[DOM]
Anne van Kesteren.
DOM Standard
. Living Standard. URL:
[DOM-PARSING]
Travis Leithead.
DOM Parsing and Serialization
. URL:
[ECMASCRIPT]
ECMAScript Language Specification
. URL:
[ENCODING]
Anne van Kesteren.
Encoding Standard
. Living Standard. URL:
[FETCH]
Anne van Kesteren.
Fetch Standard
. Living Standard. URL:
[FILEAPI]
Marijn Kruisselbrink.
File API
. URL:
[HTML]
Anne van Kesteren; et al.
HTML Standard
. Living Standard. URL:
[INFRA]
Anne van Kesteren; Domenic Denicola.
Infra Standard
. Living Standard. URL:
[MIMESNIFF]
Gordon P. Hemsley.
MIME Sniffing Standard
. Living Standard. URL:
[URL]
Anne van Kesteren.
URL Standard
. Living Standard. URL:
[WEBDRIVER-BIDI]
James Graham; Alex Rudenko; Maksim Sadym.
WebDriver BiDi
. URL:
[WEBIDL]
Edgar Chen; Timothy Gu.
Web IDL Standard
. Living Standard. URL:
[XML]
Tim Bray; et al.
Extensible Markup Language (XML) 1.0 (Fifth Edition)
. 26 November 2008. REC. URL:
[XML-NAMES]
Tim Bray; et al.
Namespaces in XML 1.0 (Third Edition)
. 8 December 2009. REC. URL:
IDL Index
Exposed
=(
Window
DedicatedWorker
SharedWorker
)]
interface
XMLHttpRequestEventTarget
EventTarget
// event handlers
attribute
EventHandler
onloadstart
attribute
EventHandler
onprogress
attribute
EventHandler
onabort
attribute
EventHandler
onerror
attribute
EventHandler
onload
attribute
EventHandler
ontimeout
attribute
EventHandler
onloadend
};
Exposed
=(
Window
DedicatedWorker
SharedWorker
)]
interface
XMLHttpRequestUpload
XMLHttpRequestEventTarget
};
enum
XMLHttpRequestResponseType
""
"arraybuffer"
"blob"
"document"
"json"
"text"
};
Exposed
=(
Window
DedicatedWorker
SharedWorker
)]
interface
XMLHttpRequest
XMLHttpRequestEventTarget
constructor
();
// event handler
attribute
EventHandler
onreadystatechange
// states
const
unsigned
short
UNSENT
= 0;
const
unsigned
short
OPENED
= 1;
const
unsigned
short
HEADERS_RECEIVED
= 2;
const
unsigned
short
LOADING
= 3;
const
unsigned
short
DONE
= 4;
readonly
attribute
unsigned
short
readyState
// request
undefined
open
ByteString
method
USVString
url
);
undefined
open
ByteString
method
USVString
url
boolean
async
optional
USVString
username
null
optional
USVString
password
null
);
undefined
setRequestHeader
ByteString
name
ByteString
value
);
attribute
unsigned
long
timeout
attribute
boolean
withCredentials
SameObject
readonly
attribute
XMLHttpRequestUpload
upload
undefined
send
optional
Document
or
XMLHttpRequestBodyInit
)?
body
null
);
undefined
abort
();
// response
readonly
attribute
USVString
responseURL
readonly
attribute
unsigned
short
status
readonly
attribute
ByteString
statusText
ByteString
getResponseHeader
ByteString
name
);
ByteString
getAllResponseHeaders
();
undefined
overrideMimeType
DOMString
mime
);
attribute
XMLHttpRequestResponseType
responseType
readonly
attribute
any
response
readonly
attribute
USVString
responseText
Exposed
Window
readonly
attribute
Document
responseXML
};
typedef
File
or
USVString
FormDataEntryValue
Exposed
=(
Window
Worker
)]
interface
FormData
constructor
optional
HTMLFormElement
form
optional
HTMLElement
submitter
null
);
undefined
append
USVString
name
USVString
value
);
undefined
append
USVString
name
Blob
blobValue
optional
USVString
filename
);
undefined
delete
USVString
name
);
FormDataEntryValue
get
USVString
name
);
sequence
FormDataEntryValue
getAll
USVString
name
);
boolean
has
USVString
name
);
undefined
set
USVString
name
USVString
value
);
undefined
set
USVString
name
Blob
blobValue
optional
USVString
filename
);
iterable
USVString
FormDataEntryValue
>;
};
Exposed
=(
Window
Worker
)]
interface
ProgressEvent
Event
constructor
DOMString
type
optional
ProgressEventInit
eventInitDict
= {});
readonly
attribute
boolean
lengthComputable
readonly
attribute
double
loaded
readonly
attribute
double
total
};
dictionary
ProgressEventInit
EventInit
boolean
lengthComputable
false
double
loaded
= 0;
double
total
= 0;
};
MDN
FormData/FormData
In all current engines.
Firefox
4+
Safari
5+
Chrome
5+
Opera
12+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
5+
Chrome for Android
Android WebView
3+
Samsung Internet
Opera Mobile
12+
MDN
FormData/append
In all current engines.
Firefox
4+
Safari
5+
Chrome
5+
Opera
12+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
5+
Chrome for Android
Android WebView
3+
Samsung Internet
Opera Mobile
12+
MDN
FormData/delete
In all current engines.
Firefox
39+
Safari
11.1+
Chrome
50+
Opera
Edge
79+
Edge (Legacy)
18
IE
None
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
MDN
FormData/get
In all current engines.
Firefox
39+
Safari
11.1+
Chrome
50+
Opera
Edge
79+
Edge (Legacy)
18
IE
None
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
MDN
FormData/getAll
In all current engines.
Firefox
39+
Safari
11.1+
Chrome
50+
Opera
Edge
79+
Edge (Legacy)
18
IE
None
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
MDN
FormData/has
In all current engines.
Firefox
39+
Safari
11.1+
Chrome
50+
Opera
Edge
79+
Edge (Legacy)
18
IE
None
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
MDN
FormData/set
In all current engines.
Firefox
39+
Safari
11.1+
Chrome
50+
Opera
Edge
79+
Edge (Legacy)
18
IE
None
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
MDN
FormData
In all current engines.
Firefox
4+
Safari
5+
Chrome
5+
Opera
12+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
5+
Chrome for Android
Android WebView
3+
Samsung Internet
Opera Mobile
12+
Node.js
18.0.0+
MDN
ProgressEvent/ProgressEvent
In all current engines.
Firefox
18+
Safari
6+
Chrome
16+
Opera
12.1+
Edge
79+
Edge (Legacy)
14+
IE
None
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
ProgressEvent/lengthComputable
In all current engines.
Firefox
3.5+
Safari
3.1+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
ProgressEvent/loaded
In all current engines.
Firefox
3.5+
Safari
3.1+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
ProgressEvent/total
In all current engines.
Firefox
3.5+
Safari
3.1+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
ProgressEvent
In all current engines.
Firefox
3.5+
Safari
3.1+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/XMLHttpRequest
In all current engines.
Firefox
1+
Safari
3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
7+
Firefox for Android
iOS Safari
1+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/abort
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/abort_event
In all current engines.
Firefox
3.5+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/abort_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/abort_event
In all current engines.
Firefox
3.5+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/abort_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/error_event
In all current engines.
Firefox
1+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/error_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/error_event
In all current engines.
Firefox
1+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/error_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/getAllResponseHeaders
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/getResponseHeader
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/load_event
In all current engines.
Firefox
1+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
9+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/load_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/load_event
In all current engines.
Firefox
1+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
9+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/load_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/loadend_event
In all current engines.
Firefox
5+
Safari
4+
Chrome
18+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/loadend_event
In all current engines.
Firefox
5+
Safari
4+
Chrome
18+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/loadend_event
In all current engines.
Firefox
5+
Safari
4+
Chrome
18+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/loadend_event
In all current engines.
Firefox
5+
Safari
4+
Chrome
18+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/loadstart_event
In all current engines.
Firefox
3.5+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/loadstart_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/loadstart_event
In all current engines.
Firefox
3.5+
Safari
1.3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/loadstart_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/open
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/overrideMimeType
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
11
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/progress_event
In all current engines.
Firefox
1+
Safari
3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
1+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/progress_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/progress_event
In all current engines.
Firefox
1+
Safari
3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
1+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
XMLHttpRequestUpload/progress_event
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/readyState
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
7+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/readystatechange_event
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
9+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/readystatechange_event
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
9+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/response
In all current engines.
Firefox
6+
Safari
5.1+
Chrome
9+
Opera
11.6+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
3+
Samsung Internet
Opera Mobile
12+
MDN
XMLHttpRequest/responseText
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/responseType
In all current engines.
Firefox
6+
Safari
5.1+
Chrome
31+
Opera
18+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
50+
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
18+
MDN
XMLHttpRequest/responseURL
In all current engines.
Firefox
32+
Safari
8+
Chrome
37+
Opera
Edge
79+
Edge (Legacy)
14+
IE
None
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
MDN
XMLHttpRequest/responseXML
In all current engines.
Firefox
1+
Safari
3+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
7+
Firefox for Android
iOS Safari
1+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/send
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/setRequestHeader
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
5+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/status
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
7+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequest/statusText
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
7+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/timeout
In all current engines.
Firefox
12+
Safari
7+
Chrome
29+
Opera
17+
Edge
79+
Edge (Legacy)
12+
IE
8+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
18+
MDN
XMLHttpRequest/timeout_event
In all current engines.
Firefox
12+
Safari
7+
Chrome
29+
Opera
Edge
79+
Edge (Legacy)
12+
IE
8+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
1.0+
Opera Mobile
XMLHttpRequestUpload/timeout_event
In all current engines.
Firefox
12+
Safari
7+
Chrome
29+
Opera
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
1.0+
Opera Mobile
MDN
XMLHttpRequest/timeout_event
In all current engines.
Firefox
12+
Safari
7+
Chrome
29+
Opera
Edge
79+
Edge (Legacy)
12+
IE
8+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
1.0+
Opera Mobile
XMLHttpRequestUpload/timeout_event
In all current engines.
Firefox
12+
Safari
7+
Chrome
29+
Opera
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
1.0+
Opera Mobile
MDN
XMLHttpRequest/upload
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequest/withCredentials
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
3+
Opera
12+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12+
MDN
XMLHttpRequest
In all current engines.
Firefox
1+
Safari
1.2+
Chrome
1+
Opera
8+
Edge
79+
Edge (Legacy)
12+
IE
7+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
10.1+
MDN
XMLHttpRequestEventTarget
In all current engines.
Firefox
1+
Safari
1+
Chrome
1+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
7+
Firefox for Android
iOS Safari
Chrome for Android
Android WebView
Samsung Internet
Opera Mobile
12.1+
MDN
XMLHttpRequestUpload
In all current engines.
Firefox
3.5+
Safari
4+
Chrome
2+
Opera
12.1+
Edge
79+
Edge (Legacy)
12+
IE
10+
Firefox for Android
iOS Safari
3+
Chrome for Android
Android WebView
37+
Samsung Internet
Opera Mobile
12.1+