Question

在Google Chrome中，有一个名为“远程地址”的标题。我正在为Firefox写一个附加组件，我需要根据远程主机决定一些内容，但看起来Firefox中没有这样的标题。如果您知道如何从观察者对象访问远程主机，请告诉我。

observe : function(aSubject, aTopic, aData) {
    //I need remote host here
}

她是Google Chrome中标题的屏幕截图 enter image description here

Answer 1

如果标题不存在，则抛出异常NS_ERROR_NOT_AVAILABLE

var {classes: Cc, interfaces: Ci, utils: Cu} = Components;
Cu.import('resource://gre/modules/Services.jsm');

var httpRequestObserver =
{
    observe: function(subject, topic, data)
    {
        var httpChannel, requestURL;
        httpChannel = subject.QueryInterface(Ci.nsIHttpChannel);
        requestURL = httpChannel.URI.spec;

        if (topic == "http-on-modify-request") {

            //if (requestURL.indexOf('google.com') > -1) {
                //httpChannel.setRequestHeader('MyCustomRequestHeader', 'hiiii', false);
                try {
                   var Host = httpChannel.getRequestHeader('Host');
                } catch (ex) {
                    var Host = 'NULL';
                }
                console.log('REQUEST Header "Host" = ' + Host);
            //}
        } else if (topic == "http-on-examine-response") {
            try {
               var Host = httpChannel.getResponseHeader('Host');
            } catch (ex) {
                var Host = 'NULL';
            }
            console.log('RESPONSE Header "Host" = ' + Host);
        }
    }
};

Services.obs.addObserver(httpRequestObserver, "http-on-modify-request", false);
Services.obs.addObserver(httpRequestObserver, "http-on-examine-response", false);
//Services.obs.removeObserver(httpRequestObserver, "http-on-modify-request", false); //run this on shudown of your addon otherwise the observer stags registerd
//Services.obs.removeObserver(httpRequestObserver, "http-on-examine-response", false); //run this on shudown of your addon otherwise the observer stags registerd

用于制作此代码段的实用文章：

什么是＆＃34;远程地址＆＃34;的替代方案。 FireFox中的标题？

1 个答案: