XMLHttpRequest.send()

The XMLHttpRequest method send() sends the request to the server.

If the request is asynchronous (which is the default), this method returns as soon as the request is sent and the result is delivered using events. If the request is synchronous, this method doesn't return until the response has arrived.

send() accepts an optional parameter which lets you specify the request's body; this is primarily used for requests such as PUT. If the request method is GET or HEAD, the body parameter is ignored and the request body is set to null.

If no Accept header has been set using the setRequestHeader(), an Accept header with the type "*/*" (any type) is sent.

Syntax

XMLHttpRequest.send(body)

Parameters

body Optional

A body of data to be sent in the XHR request. This can be:

If no value is specified for the body, a default value of null is used.

The best way to send binary content (e.g. in file uploads) is by using an ArrayBufferView or Blob in conjunction with the send() method.

Return value

undefined.

Exceptions

Exception Description
InvalidStateError send() has already been invoked for the request, and/or the request is complete.
NetworkError The resource type to be fetched is a Blob, and the method is not GET.

Example: GET

var xhr = new XMLHttpRequest();
xhr.open('GET', '/server', true);

xhr.onload = function () {
  // Request finished. Do processing here.
};

xhr.send(null);
// xhr.send('string');
// xhr.send(new Blob());
// xhr.send(new Int8Array());
// xhr.send(document);

Example: POST

var xhr = new XMLHttpRequest();
xhr.open("POST", '/server', true);

//Send the proper header information along with the request
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

xhr.onreadystatechange = function() { // Call a function when the state changes.
    if (this.readyState === XMLHttpRequest.DONE && this.status === 200) {
        // Request finished. Do processing here.
    }
}
xhr.send("foo=bar&lorem=ipsum");
// xhr.send(new Int8Array());
// xhr.send(document);

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
send
1
12
1
5
8
1.2
1
18
4
10.1
1
1.0
ArrayBuffer
9
12
9
10
11.6
7
≤37
Yes
9
Yes
7
Yes
ArrayBufferView
22
≤79
20
?
Yes
7
≤37
Yes
20
Yes
7
Yes
Blob
22
12
2
10
12
6
≤37
Yes
4
Yes
6
Yes
FormData
6
12
2
10
12
6
≤37
Yes
4
Yes
6
Yes
URLSearchParams
59
≤79
44
?
12
No
59
59
44
Yes
No
7.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/send