javascript - Getting HTTP Response Header in Firefox Addon -


i trying http response reading response header. not able retrieve anything. missing exactly? here code in index.js

var {cc, ci} = require("chrome"); var httprequestobserver = {    init: function() {       var observerservice = cc["@mozilla.org/observer-service;1"].getservice(ci.nsiobserverservice);       observerservice.addobserver(this, "http-on-examine-response", false);    },    observe: function(subject, topic, data)    {     if (topic == "http-on-examine-response") {          subject.queryinterface(ci.nsihttpchannel);             this.onexamineresponse(subject);     }   }, onexamineresponse: function (ohttp)   {           console.log("header :"+json.stringify(ohttp));         try        {          var header_value = ohttp.getresponseheader("<the_header_that_i_need>");           // uri nsiuri of response you're looking @           // , spec gives full url string          var url = ohttp.uri.spec;        }        catch(err)        {          console.log(err);        }    } };  httprequestobserver.init();

i reference stackoverflow , several online blogs.:- firefox add-on sdk: http response headers

edited

i checked values in console.

  • subject coming ()
  • data coming null

do:

 ohttp = ohttp.queryinterface(ci.nsihttpchannel);

in onexaminresponse after getrepsonseheader should work

edit:

this works me:

services.obs.removeobserver(httprequestobserver, "http-on-examine-response", false); var httprequestobserver = {    init: function() {       services.obs.addobserver(this, "http-on-examine-response", false);    },    observe: function(subject, topic, data)    {          subject = subject.queryinterface(ci.nsihttpchannel);             this.onexamineresponse(subject);   }, onexamineresponse: function (ohttp)   {           //console.log("header :"+json.stringify(ohttp));          var url = ohttp.uri.spec;          console.log('url:', url);          try        {          // uri nsiuri of response you're looking @           // , spec gives full url string          var header_value = ohttp.getresponseheader("x-firefox-spdy");           console.log('header_value:', header_value);        }        catch(err)        {          if (err.name == 'ns_error_not_available') {            console.log('this http request not have header x-firefox-spdy')          } else {           console.error(err);          }        }    } };  httprequestobserver.init();

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