Question

我试图通过读取响应头来获取HTTP响应。但我无法找回任何东西。我到底错过了什么？这是我在 index.js

中的代码

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 is the nsIURI of the response you're looking at 
         // and spec gives you the full URL string
         var url = oHttp.URI.spec;
       }
       catch(err)
       {
         console.log(err);
       }
   }
};

httpRequestObserver.init();

我从这个stackoverflow和几个在线博客中得到了参考:- Firefox add-on SDK: Get http response headers

被修改

我在控制台中检查了值。

主题即将（）
数据显示为空

Answer 1

执行：

 oHttp = oHttp.QueryInterface(Ci.nsIHttpChannel);

onExaminResponse中的

然后getRepsonseHeader应该起作用

编辑：

这对我有用：

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 is the nsIURI of the response you're looking at 
         // and spec gives you the 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 does not have header X-Firefox-Spdy')
         } else {
          console.error(err);
         }
       }
   }
};

httpRequestObserver.init();

在Firefox Addon中获取HTTP响应标头

1 个答案: