25.326. XMLHttpRequest.send( ): send an HTTP request25.326.1. Synopsisvoid send(Object body) 25.326.1.1. Arguments
25.326.2. DescriptionThis method causes an HTTP request to be issued. If there has been no previous call to open( ), or, more generally, if readyState is not 1, send( ) tHRows an exception. Otherwise, it issues an HTTP request that consists of:
Once the request has been issued, send( ) sets readyState to 2 and triggers the onreadystatechange event handler. If the async argument to the previous call to open( ) was false, this method blocks and does not return until readyState is 4 and the server's response has been fully received. Otherwise, if the async argument is true or if that argument is omitted, send( ) returns immediately, and the server's response is processed, as described next, on a background thread. If the server responds with an HTTP redirect, the send( ) method or the background thread follow the redirect automatically. When all HTTP response headers have been received, send( ) or the background thread sets readyState to 3 and triggers the onreadystatechange event handler. If the response is long, send( ) or the background thread may trigger the onreadystatechange more than once while in state 3: this can serve as a download progress indicator. Finally, when the response is complete, send( ) or the background thread sets readyState to 4 and triggers the event handler one last time. 25.326.3. See AlsoXMLHttpRequest.open( ); Chapter 20 |