PHP之Http请求

Http:超文本传输协议（英文：HyperText Transfer
Protocol，缩写：HTTP）是互联网上应用最为广泛的一种网络协议。

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http请求协议

• 请求行

Request URL:http://www.hotel.wsq.com/Request Method:GETStatus Code:200 OKRemote Address:127.0.0.1:80

• 请求头

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8       #可接受的内容类型Accept-Encoding:gzip, deflate, sdch #可接受的数据编码类型（压缩编码）Accept-Language:zh-CN,zh;q=0.8  #浏览器可接受语言Cache-Control:max-age=0 #缓存控制选项Connection:keep-alive   #tcp连接类型Host:www.hotel.wsq.com      #标识一台web服务器上的一个虚拟主机Upgrade-Insecure-Requests:1User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36#空行表示头部分结束

• 请求内容

username:[e-mail]:123

模拟请求

连接目标服务器，发送符合请求协议格式的数据
服务器将其视为请求发出响应

连接：fsockopen()
处理请求数据：请求头
发送请求：fwrite()
处理响应：fgets()
断开连接：fclose()

//GET<?php$host = 'www.hotel.wsq.com';$port = '80';$link = fsockopen($host,$port);//var_dump($link);define('CRLF',"\r\n");//请求行$req = 'GET /index.php HTTP/1.1'.CRLF;//请求头$req.='HOST:www.hotel.wsq.com'.CRLF;$req.='User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36'.CRLF;$req.='Connection:keep-alive'.CRLF;//空行表结束$req.=CRLF;//请求主体//GET没有主体//发送请求fwrite($link,$req);//处理响应数据while(!feof($link)){    echo fgets($link,1024);}//断开连接fclose($link);

//POST<?php$host = 'www.hotel.wsq.com';$port = '80';$link = fsockopen($host,$port);//var_dump($link);define('CRLF',"\r\n");//请求行$req = 'POST /index.php HTTP/1.1'.CRLF;//请求头$req.='HOST:www.hotel.wsq.com'.CRLF;$req.='User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36'.CRLF;$req.='Connection:keep-alive'.CRLF;//post特殊请求头$arr = array('username'=>"root",'password'=>'root');$len = http_build_query($arr);$req.='Content-Length:'.strlen($len).CRLF;//echo $len.strlen($len) ;die;$req.='Content-Type:application/x-www-form-urlencoded'.CRLF;//空行表结束$req.=CRLF;//请求主体$req.=$len;//发送请求fwrite($link,$req);//处理响应数据while(!feof($link)){    echo fgets($link,1024);}//断开连接fclose($link);

curl模拟请求

client url

php扩展，可以用来模拟url客户端（浏览器，请求代理）的工具扩展
；extension=php_curl.dll

• 依赖类库：
  libeay32.dll
  ssleay32.dll

//GET<?php$curl = curl_init();$url = 'www.hotel.wsq.com';curl_setopt($curl,CURLOPT_URL,$url);curl_exec($curl);curl_close($curl);

//POST<?php$curl = curl_init();$url = 'www.hotel.wsq.com';$data = array('username'=>'[e-mail]','password'=>'manager');curl_setopt($curl,CURLOPT_URL,$url);curl_setopt($curl,CURLOPT_POST,true);curl_setopt($curl,CURLOPT_POSTFIELDS,$data);//curl_setopt($curl,CURLOPT_HEADER,true);curl_exec($curl);curl_close($curl);

//Upload<?php$curl = curl_init();$url = 'www.wsq.com/app/http/curl/upload.php';$data = array('logo'=>'@D:\phpStudy\WWW\app\http\curl\2015-10-21_150123.png');curl_setopt($curl,CURLOPT_URL,$url);curl_setopt($curl,CURLOPT_POST,true);curl_setopt($curl,CURLOPT_POSTFIELDS,$data);curl_exec($curl);curl_close($curl);

//Cookie<?php$curl = curl_init();$url = 'www.hotel.wsq.com';$data = array('username'=>'[e-mail]','password'=>'manager');curl_setopt($curl,CURLOPT_URL,$url);curl_setopt($curl,CURLOPT_POST,true);curl_setopt($curl,CURLOPT_POSTFIELDS,$data);curl_setopt($curl,CURLOPT_COOKIEJAR,'D:\phpStudy\WWW\app\http\curl\cookie.txt');//curl_setopt($curl,CURLOPT_HEADER,true);curl_exec($curl);curl_close($curl);$curl = curl_init();$url = 'www.hotel.wsq.com/index.php?p=admin&c=index&a=index&l=1';curl_setopt($curl,CURLOPT_URL,$url);curl_setopt($curl,CURLOPT_COOKIEFILE,'D:\phpStudy\WWW\app\http\curl\cookie.txt');curl_exec($curl);curl_close($curl);

响应协议

• 响应行

Request URL:http://www.hotel.wsq.com/Request Method:POST//重定向Status Code:302 FoundRemote Address:127.0.0.1:80

响应状态码与响应消息一一对应
404 Not Found
403 Forbidden
200 OK
500 ServerInternalError

• 响应头
  服务器告知浏览器属性信息

Cache-Control:no-store, no-cache, must-revalidate, post-check=0, pre-check=0Connection:Keep-AliveContent-Length:383Content-Type:text/htmlDate:Wed, 06 Apr 2016 02:53:54 GMT//设置缓存Expires:Thu, 19 Nov 1981 08:52:00 GMTKeep-Alive:timeout=5, max=100Location:index.php?p=admin&c=index&a=index&l=1Pragma:no-cacheServer:Apache/2.4.10 (Win32) OpenSSL/0.9.8zb PHP/5.3.29X-Powered-By:PHP/5.3.29

• 响应主体
  通过浏览器查看源代码看到的信息

操作响应

• 操作响应头：header()

//操作缓存时间<?phpheader('Expires:'.gmdate('D, d M Y H:i:s',time()+5).' GMT');echo date('s');?><hr><a href='re_header.php'>self</a>

• 操作响应主体：任何输出

//文件下载<?php$file = './2015-10-21_150123.png';header('Content-Disposition:Attachment;filename='.basename($file));$finfo = new Finfo(FILEINFO_MIME_TYPE);$mime = $finfo->file($file);//echo $mime;header('Content-Type: '.$mime);header('Content-Length: '.filesize($file));$mo = 'rb';$link = fopen($file,$mo);while(!feof($link)){    echo fgets($link,1024);}fclose($link);