Firefox 附加 SDK:获取 http 响应标头 [英] Firefox add-on SDK: Get http response headers

问题描述

我是插件开发的新手，我已经为这个问题苦苦挣扎了一段时间.这里有一些问题在某种程度上是相关的，但它们还没有帮助我找到解决方案.

I'm new to add-on development and I've been struggling with this issue for a while now. There are some questions here that are somehow related but they haven't helped me to find a solution yet.

所以，我正在开发一个 Firefox 插件，当任何网页加载到浏览器的任何选项卡中时，它都会读取一个特定的标题.

So, I'm developing a Firefox add-on that reads one particular header when any web page that is loaded in any tab in the browser.

我能够观察标签加载，但我认为没有办法在以下(简单)代码中读取 http 标头，只有 url.如果我错了，请纠正我.

I'm able to observer tab loads but I don't think there is a way to read http headers inside the following (simple) code, only url. Please correct me if I'm wrong.

var tabs = require("sdk/tabs");
tabs.on('open', function(tab){
  tab.on('ready', function(tab){
    console.log(tab.url);
  });
});
});

我还可以通过观察这样的 http 事件来读取响应标头:

I'm also able to read response headers by observing http events like this:

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)
  {  
        try
       {
         var header_value = oHttp.getResponseHeader("<the_header_that_i_need>"); // Works fine
         console.log(header_value);        
       }
       catch(err)
       {
         console.log(err);
       }
   }
};

问题(也是个人困惑的主要来源)是，当我阅读响应标头时，我不知道响应是针对哪个请求的.我想以某种方式映射请求(尤其是请求 url)和响应标头(the_header_that_i_need").

The problem (and a major source of personal confusion) is that when I'm reading the response headers I don't know to which request the response is for. I want to somehow map the request (request url especially) and the response header ("the_header_that_i_need").

推荐答案

你已经差不多了，看看 此处的示例代码了解更多您可以做的事情.

You're pretty much there, take a look at the sample code here for more things you can do.

  onExamineResponse: function (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);
       }
   }

人们还经常需要找到相关的标签，这回答了 查找触发 http-on-examine-response 事件的选项卡

Also people often need to find the tab related, which this answers Finding the tab that fired an http-on-examine-response event

这篇关于Firefox 附加 SDK:获取 http 响应标头的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！