模拟Http请求

使用Telnet模拟Http请求

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打开cmd运行框，输入Telnet www.baidu.com 80后按回车键。此时看到的界面是黑屏状态，标题栏显示 Telnet www.baidu.com
如果提示telnet不是内部或外部命令可以参考百度经验。利用快捷键打开“Ctrl+]”打开Telnet回显，按回车键后可以进入编辑状态。

回显模式：

Telnet回显

编辑模式：

Telnet编辑模式

接下来是考验手速的时候了，单身党一定完胜的游戏。输入GET /index.html HTTP/1.1按回车键，接着输入HOST:www.baidu.com,连续按两次回车键（两次回车代表提交请求）输入速度不够快的话，将会连接失败。可以将代码写入记事本，使用时直接复制就好了。

然后来看看服务器的返回数据：

Telnet服务器返回数据

PHP模拟HTTP请求

---

Http.class.php

<?php
    class HttpRequest
    {
        private $_host;                 //主机地址
        private $_port;                 //端口号
        private $_requestHead;          //请求头信息
        private $_requestMethod;        //请求方式
        private $_requestPath;          //请求路径
        private $_requestContent = '';          //请求正文
        const HTTP_VERSION = '1.1';     //协议版本

        /**
         * [__contruction 初始化成员属性]
         * @author:JieJie
         */
        public function __construct($host,$port,$method,$path) 
        {
            $this->_host = $host;
            $this->_port = $port;
            $this->_requestMethod = strtoupper($method);
            $this->_requestPath = $path;
        }

        /**
         * [setRequestHead 设置请求头信息]
         * @author:JieJie
         * @DateTime:2016-11-25T00:22:04+0800
         * @param      [array] $data [头信息数组]
         */
        public function setRequestHead($data) {
            foreach ($data as $key => $value) {
                $this->_requestHead .= $key.':'.$value."\r\n";
            }
            $this->_requestHead .= "\r\n";

            return $this;
        }

        /**
         * [setRequestContent 设置请求正文]
         * @author:JieJie
         * @DateTime:2016-11-25T00:37:53+0800
         * @param  [array] $data 
         */
        public function setRequestContent($data) {
            if($this->_requestMethod != 'POST')  
                return $this;

            foreach ($data as $key => $value) {
                $this->_requestContent .= "{$key}={$value}&";
            }
            $this->_requestContent = rtrim($this->_requestContent,'&')."\r\n";
            return $this;
        }

        /**
         * [sendRequest 发送HTTP请求并获取结果]
         * @author:JieJie
         * @DateTime:2016-11-25T00:51:53+0800
         */
        public function sendRequest() {
            //拼接请求行
            $http = "{$this->_requestMethod} {$this->_requestPath} HTTP/1.1\r\n";
            //拼接请求头
            $http .= $this->_requestHead;
            //拼接请求正文
            $http .= $this->_requestContent;
            //创建连接
            $fp = fsockopen($this->_host,$this->_port,$errno,$errstr);
            if(!$fp) 
                throw new Exception($errstr);

            //发送请求
            fwrite($fp, $http);
            //获得结果
            $result = '';
            while (!feof($fp)) 
                $result .= fgets($fp);

            return $result;
        }
    }
?>

client.php

<?php
    include './Http.class.php';

    $Http = new HttpRequest('www.jiejieyh.cn','80','POST','/login.php');
    $requestHead = [
        'Host'=>'www.jiejieyh.cn',
        'User-Agent'=>'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0',
        'Accept'=>'application/json, text/javascript, */*; q=0.01',
        'Accept-Language'=>'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
        'Accept-Encoding'=>'gzip, deflate',
        'Content-Type'=>'application/x-www-form-urlencoded;',
        'charset'=>'UTF-8',
        'X-Requested-With'=>'XMLHttpRequest',
        'Referer'=>'http://www.jiejieyh.cn',
        'Content-Length'=>47,
        'Connection'=>'keep-alive'
    ];
    $requestContent = [
        'password' => 'admin',
        'username' => '123456',
    ];
    $result = $Http->setRequestHead($requestHead)->setRequestContent($requestContent)->sendRequest();
    echo $result;
?>