asp.net mvc - AJAX POST does not return a file download -

i have post ajax request in asp.net mvc application, works this:

$.ajax({     type: "post",     url: 'https://localhost:44300/api/values',     data: ruledata,     contenttype: "application/json; charset=utf-8" }); 

in case, ruledata encompasses json blob:

var ruledata = json.stringify({     'targetproduct': "someproduct",     'content': editor.getvalue(),     'targetproductversion' : "1.0" }); 

the request backed post handled in web api application, returns pushstreamcontent appropriate headers.

return new httpresponsemessage(httpstatuscode.ok) { content = pushstreamcontent}; 

in fiddler, see response web api coming application/octet-stream, in right size expecting (it generates zip file in backend), there never dialog shown allow user download file.

what missing?

solved xhr

var xhr = new xmlhttprequest();                 xhr.responsetype = "blob";                 xhr.onreadystatechange = function(){                     if (this.readystate == 4) {                         if (this.status == 200)                             {                             download(xhr.response, "bundle.zip", "application/zip");                         }                         else if (this.status == 400) {                             var reader = new filereader();                             reader.onload = function(e) {                                 var text = reader.result;                                 alert(text);                             }                             reader.readastext(xhr.response);                         }                     }                 }                 xhr.open('post', 'https://localhost:44300/api/values');                 xhr.setrequestheader('content-type', 'application/json; charset=utf-8');                 xhr.responsetype = 'blob'; // response blob , not text                 xhr.send(ruledata);