javascript - Prevent preflight OPTIONS when using sub domains -

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given 2 sub domains:

web.mysite.com , api.mysite.com

currently making request web. api. results in preflight options request being made. wouldn't of issue if didn't add 600ms requests in china.

i told setting document.domain = 'mysite.com'; in js resolve issue hasn't helped @ all.

is possible / how can disable options request when sending different sub domain.

solved using iframe technique seems facebook / twitter do.

steps below:

1) set document.domain root domain. given url http://site.mysite.com/ set domain in javascript document.domain = 'mysite.com';

2) setup iframe pulls html file api domain.

<iframe id="receiver" src="http://api.mysite.com/receiver" style="position:absolute;left:-9999px"></iframe>

this set positioned can't seen.

3) set html of receiver page set domain:

<!doctype html><body><script>document.domain='mysite.net'</script></body></html>

4) added onload event iframe capture window once loaded.

onload="window.tempiframecallback()"

5) assign child window variable.

window.tempiframecallback = function() {   window.childwindow = window.receiver.contentwindow; }

6) make xmlhttprequest() childwindow instead of main window. 

var xhr = new window.childwindow.xmlhttprequest();

now requests sent without preflight options request.

7) when using jquery, can set source of xhr in settings:

$.ajax({   ...   xhr: function() {     return new window.childwindow.xmlhttprequest();   } });

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