PHP retrieves remote files

PHP retrieves remote files if (! (Inclucontentsfile_get_contents(finance.yahoo.comdquotes.csv? SAMZN&e.csv & amp; fslldltlclohgv) {die (failtoopenyahoo) ;}; echo $ contents; why do I need to refresh 3-4 on average to obtain remote files in PHP?
If (! ($ Contents = file_get_contents ('http: // finance.yahoo.com/d/quotes.csv? S=amzn&e;.csv & f = slldltlclohgv '))){
Die ('fail to open yahoo ');
};
Echo $ contents;


Why is it possible to refresh on average 3-4 times before it succeeds? a warning will appear for others, prompting HTTP request failed!


------ Solution --------------------

C/C ++ code

Bart Friederichs 16-Apr-2012 12:17file_get_contents can do a POST, create a context for that first:$opts = array('http' =>  array(    'method'  => 'POST',    'header'  => "Content-Type: text/xml\r\n".      "Authorization: Basic ".base64_encode("$https_user:$https_password")."\r\n",    'content' => $body,    'timeout' => 60  ));                        $context  = stream_context_create($opts);$url = 'https://'.$https_server;$result = file_get_contents($url, false, $context, -1, 40000);pperegrina 21-Dec-2011 11:30For those having this problem when trying to get_file_contents(url):Warning: file_get_contents(url): failed to open stream: HTTP request failed!  in xx on line yyIf you are behind a SonicWall firewall, read this:https://bugs.php.net/bug.php?id=40197(this little line: uncheck a box in the internal settings of the firewall labled "Enforce Host Tag Search with for CFS")Apparently by default SonicWall blocks any HTTP request without a "Host:" header, which is the case in the PHP get_file_contents(url) implementation.This is why, if you try to get the same URL from the same machine with cURL our wget, it works.I hope this will be useful to someone, it took me hours to find out :)godwraith01 at yahoo dot com 11-Oct-2011 04:16I experienced a problem in using hostnames instead straight IP with some server destinations.If i use file_get_contents("www.jbossServer.example/app1",...)i will get an 'Invalid hostname' from the server i'm calling.This is because file_get_contents probably will rewrite your request after getting the IP, obtaining the same thing as :file_get_contents("xxx.yyy.www.zzz/app1",...)And you know that many servers will deny you access if you go through IP addressing in the request.With cURL this problem doesn't exists. It resolves the hostname leaving the request as you set it, so the server is not rude in response.