Access-Control-Allow-Methods: OPTIONS & CORS
Access-Control-Allow-Methods: OPTIONS
CORS
https://stackoverflow.com/questions/20478312/default-value-for-access-control-allow-methods
https://www.html5rocks.com/en/tutorials/cors/
https://www.w3.org/TR/cors/#preflight-request
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Methods
Comma-delimited list of the allowed HTTP request methods.
Access-Control-Allow-Methods: POST, GET, OPTIONS
https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods
https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS
https://fetch.spec.whatwg.org/#http-access-control-allow-methods
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Preflighted_requests
demo
var invocation = new XMLHttpRequest();
var url = 'http://bar.other/resources/post-here/';
var body = '<?xml version="1.0"?><person><name>Arun</name></person>';
function callOtherDomain(){
if(invocation)
{
invocation.open('POST', url, true);
invocation.setRequestHeader('X-PINGOTHER', 'pingpong');
invocation.setRequestHeader('Content-Type', 'application/xml');
invocation.onreadystatechange = handler;
invocation.send(body);
}
}
// ......
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