javascript - XMLHttpRequest.getResponseHeader() returns null -

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i've created custom mime type called application/x-mytype extension .mytype following this link. then, created file in server named test.mytype , i'm trying it's content-type via xmlhttprequest looks browser cannot detect it.

var xmlhttp; if (window.xmlhttprequest) {// code ie7+, firefox, chrome, opera, safari     xmlhttp = new xmlhttprequest(); } else {     xmlhttp = new activexobject("microsoft.xmlhttp"); }  xmlhttp.open("get", "https://{myserver}/test.mytype", true); xmlhttp.send(null);  xmlhttp.onreadystatechange = function (oevent) {     if(xmlhttp.readystate==4) {         var contenttype = xmlhttp.getresponseheader('content-type');         console.log(contenttype); // prints null          if(contenttype === 'application/x-mytype') {             // never arrives here         }      }  };

if @ "file type" via windows explorer, can see custom type, looking @ windows registries. have set else or browsers aren't supposed identify custom mime type?


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