Steam as OpenID stopped working when I changed server - php

Question

I did a website which uses Steam as OpenID provider. I firstly hosted it on a shared hosting.
But the traffic grew from 50 users in a day to 1000 in a day. I wasn't expecting that and had to change my host. I took another shared hosting with better performance, etc. to see how it is going to grow. But there's now a problem.
My OpenID login with Steam which worked perfectly on the last host doesn't work anymore. I tried with Google, and it worked. So I don't think my script uses a functionality that isn't enabled on my new host.
So when I put Steam identity, it loads during about 30 seconds and then Chrome returns me an error, ERR_EMPTY_RESPONSE. I tried to activate error_reporting E_ALL, but it does the same.
I am using LightOpenID, and here is the portion of the code incriminated:
$openid->identity = 'http://steamcommunity.com/openid';
header('Location: ' . $openid->authUrl());
Actually, it doesn't work whenever I call $openid->authUrl(). Here is the complete code: http://pastebin.com/rChDzECq
How can I resolve this? Thank you in advance.

Answer 1

I also had problems fighting the LightOpenID code in the last couple of hours. I finally made it work and here is what I learned in the process.
Absolutely no HTML output before the header() command. Even the tiniest space prevented the command from redirecting anything.
My server wouldn't allow the use of file_get_contents() and just returned a 404 error from the URL passed to it. You can solve this problem with a custom file_get_contents_curl() command. Here's the one I used myself:
function file_get_contents_curl($url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 15);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
I know this is a late answer but I hope it will help someone.