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openRequest()has already been called) is the equivalent of calling
void open( DOMString method, DOMString url, optional boolean async, optional DOMString user, optional DOMString password );
- The HTTP method to use, such as "GET", "POST", "PUT", "DELETE", etc. Ignored for non-HTTP(S) URLs.
- The URL to send the request to.
- An optional boolean parameter, defaulting to
true, indicating whether or not to perform the operation asynchronously. If this value is
send()method does not return until the response is received. If
true, notification of a completed transaction is provided using event listeners. This must be true if the
true, or an exception will be thrown.Note: Starting with Gecko 30.0 (Firefox 30.0 / Thunderbird 30.0 / SeaMonkey 2.27), synchronous requests on the main thread have been deprecated due to the negative effects to the user experience.
- The optional user name to use for authentication purposes; by default, this is an empty string.
- The optional password to use for authentication purposes; by default, this is an empty string.
Specification Status Comment XMLHttpRequest
The definition of 'open()' in that specification.
Living Standard WHATWG living standard
Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit) Basic support 1 (Yes) 5
(Yes) 1.2 Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Basic support (Yes) 1.0 (Yes) (Yes) (Yes) (Yes)
 This feature was implemented via ActiveXObject(). Internet Explorer implements the standard XMLHttpRequest since version 7.
See alsoUsing XMLHttpRequest