http基础和php里file_get_contents,fsockopen,fopen发送post

报文:用于http协议交互的信息

请求行:包括请求的方法,url和http协议版本

状态行:包括响应结果的状态码,状态描述和http版本

首部字段:包括请求和响应的各种条件和属性值(键值对)

telnet模拟http请求

1. cmd下->telnet 主机地址 80，回车
2. 按下快捷键:Ctrl+] ,再按下回车,打开回显功能
3. 发送请求报文

模拟get

telnet 127.0.0.1 80 回车

ctrl+]再回车

get /web/t.php?a=1&b=2&c=3 http/1.1    //---->请求行

host:localhost //请求首部

(空行)

 

响应内容

HTTP/1.1 200 OK

Date: Wed, 21 Mar 2018 14:22:38 GMT

Server: Apache/2.4.23 (Win64) PHP/5.6.25

X-Powered-By: PHP/5.6.25

Content-Length: 29

Content-Type: text/html; charset=UTF-8

 

2018-03-21 22:22:46

1,2,3end

 

模拟post

post /web/t.php http/1.1

host:localhost

Content-type:application/x-www-form-urlencoded

content-length:20

(空行)

a=1&b=2&c=3   (报文主体,到长度后直接返回结果)

 

Php获取

print_r(file_get_contents("php://input"));

$_POST获取不到数据(menthod小写导致)

 

根据RFC2616，HTTP Method是区分大小写的，而Header是不区分的。
所以 GET/POST/PUT等需要大写，而content-encoding/user-agent则不用

 

 file_get_contents和fopen模拟post请求

rev.php(接受请求的)

<?php
echo "<pre>";
print_r($_POST);
print_r($_SERVER['HTTP_TEST']);

send.php (发送)

<?php
$rev='http://localhost/web/http/rev.php';
$data=['a'=>'ajax','b'=>22];
$post_data=http_build_query($data);

$opt=[
    'http'=>[
        'method'=>'POST',
        'header'=>
            "host:localhost\r\n".
            "Content-type:application/x-www-form-urlencoded\r\n".
            'Content-length:'.strlen($post_data)."\r\n".
            "test:tt\r\n",
        'content'=>$post_data
    ]
];
$context=stream_context_create($opt);

$file_get=false;
if($file_get){
    $r=file_get_contents($rev,false,$context);
    echo $r;
}else{
    $r=fopen($rev,'r',false,$context);
    while(!feof($r)){
        echo fread($r,1024);
    }
    fclose($r);
}

结果

 

Array
(
    [a] => ajax
    [b] => 22
)
tt

要特别注意\r\n必须用双引号

 fsockopen模拟

<?php
$rev='http://localhost/web/http/rev.php';
$data=['a'=>'ajax','b'=>22];
$post_data=http_build_query($data);



$fp=fsockopen("localhost",80,$errno,$errStr,5);
if($errno){
    echo $errStr;
}else{
    $request="POST {$rev} HTTP/1.1\r\n";
    $request.="host:localhost\r\n";
    $request.="test:tt\r\n";
    $request.="content-type:application/x-www-form-urlencoded\r\n";
    $request.="content-length:".strlen($post_data)."\r\n\r\n";
    $request.=$post_data;
    if(false!==fwrite($fp,$request)){
        while(!feof($fp)){
            echo fgets($fp,1024);
        }
        fclose($fp);
    }else{
        echo 'fwrite error';
    }
}

结果

HTTP/1.1 200 OK Date: Thu, 22 Mar 2018 14:44:17 GMT Server: Apache/2.4.23 (Win64) PHP/5.6.25 X-Powered-By: PHP/5.6.25 Content-Length: 47 Content-Type: text/html; charset=UTF-8
Array
(
    [a] => ajax
    [b] => 22
)
tt