I'm trying to use Basic HTTP Authentication and followed the example on the PHP manual page. But it doesn't work for me. The variable $_SERVER['PHP_AUTH_USER'] doesn't seem to be set. When a user t...

What does the utmscr and/or utmcct values mean in reference to the Http cookie Server variable? Are they acronyms or short for something? We are getting Elmah errors with the title "System.Web.Htt...

What is the difference between $_SERVER['HTTP_HOST'] and $_SERVER['SERVER_NAME'] in PHP? When would you consider using one over the other and why?

I tried to implement a small authentication via http and copied this bit of code from the net to check whether this will work properly: <?php if(!isset($_SERVER['PHP_AUTH_USER'])) { header('W...

What is the difference between these two variables? REMOTE_HOST and REMOTE_ADDR.

In exisiting .Net Web Site, Server Variables is accessed using HttpContext.Current.Request.ServerVariables["HTTP_ACCEPT_LANGUAGE"] How to access the ServerVariables in AspnetCore 1.0 Web Applic...

In my local environment (PHP 5.4.24 on Apache 2.2.26) $_SERVER["SCRIPT_URL"] is present, but I read around that this variable is not always present, even though I couldn't find exactly when it is a...

If there is not any difference, why having two server parameters to achieve one behavior?