Three ways to forge the URL source of the HTTP_REFERER page in php

php gets the URL address of the previous page of the current page, that is, which page the current page is linked from. You can use $_SERVER['HTTP_REFERER'], but the URL address of this source page can be forged and spoofed. This article introduces three methods of forging HTTP_REFERER page URLs. Friends in need can refer to them.

$_SERVER['HTTP_REFERER'] is a super variable used by PHP to determine the parent source page of the page. We can use $_SERVER['HTTP_REFERER'] to determine which page we entered from. This page has been added so we can track it better.

But $_SERVER['HTTP_REFERER'] can also be forged and deceived. There are three ways to forge and deceive $_SERVER['HTTP_REFERER']

The first method: file_get_contents

$opt=array('http'=>array('header'=>"Referer: $refer")); 
$context=stream_context_create($opt); 
$file_contents = file_get_contents($url,false, $context);

stream_context_create in file_get_contents forges important parameters of the source.

Second method: CURL

$ch = curl_init(); 
curl_setopt ($ch, CURLOPT_URL, "http://www.manongjc.com"); 
curl_setopt ($ch, CURLOPT_REFERER, "http://www.manongjc.com"); 
curl_exec ($ch); 
curl_close ($ch);

The parameter http://www.manongjc.com is the forged URL address.

The third method: fsockopen

$server = 'www.manongjc.com'; 
$host = 'www.manongjc.com'; 
$target = 'index.php'; 
$referer = 'http://www.manongjc.com/'; // Referer 
$port = 80; 
$fp = fsockopen($server, $port, $errno, $errstr, 30); 
if (!$fp){ 
 echo "$errstr ($errno)＼n"; 
}else{ 
$out = "GET $target HTTP/1.1＼r＼n"; 
$out .= "Host: $host＼r＼n"; 
$out .= "Referer: $referer＼r＼n"; 
$out .= "Connection: Close＼r＼n＼r＼n"; 
fwrite($fp, $out); 
while (!feof($fp)){ 
echo fgets($fp, 128); 
} 
fclose($fp); 
}

Among the above three methods, the third method fsockopen has the best performance and effect, so it is recommended that you use the third method.

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