相关疑难解决方法(0)

如何在Firefox扩展中更改HTTP响应正文？我已经使用下面的代码设置了一个http-on-examine-response观察者和一个nsIStreamListener对象.在我获取数据,解析并更改它之后,如何将更改的响应推送回firefox浏览器？例如,假设我在启用扩展程序的情况下访问Google.com,扩展程序应截取响应并将"google"的每次更改更改为"goggle".因此,当页面加载时,用户将在任何地方看到"goggle".

function TmSteroidsObserver()
{
  this.register();
}


TmSteroidsObserver.prototype = {
  observe: function(subject, topic, data) {

    if (topic == "http-on-examine-response") {

    }
    else if (topic == "http-on-modify-request") {
       var channel = subject.QueryInterface(Components.interfaces.nsIChannel);
       var listener = new StreamListener(channel);
    }

  },

  register: function() {
    var observerService = Components.classes["@mozilla.org/observer-service;1"]
                                .getService(Components.interfaces.nsIObserverService);
    observerService.addObserver(listener, "http-on-modify-request", false);
    observerService.addObserver(listener, "http-on-examine-response", false);
  },

  unregister: function() {
    var observerService = Components.classes["@mozilla.org/observer-service;1"]
                            .getService(Components.interfaces.nsIObserverService);
    observerService.removeObserver(this, "http-on-modify-request");
    observerService.removeObserver(this, "http-on-examine-response");
  },

  QueryInterface : function(aIID) {
    if (aIID.equals(Components.interfaces.nsISupports) ||
        aIID.equals(Components.interfaces.nsIObserver))
      return this;
    throw Components.results.NS_NOINTERFACE;
  }

}

function …