Difference between AUTH_USER and REMOTE_USER cgi variables


Difference between AUTH_USER and REMOTE_USER cgi variables



The docs aren't entirely clear on this - is there a difference between these variables? On IIS at least they appear to be identical, but I don't want to rely on that if it might be different under other servers.




IIS 6 compression configuration as told by Jeff

1:



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According to the Adobe ColdFusion documentation they are the same.


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.
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http://livedocs.adobe.com/coldfusion/8/htmldocs/help.html?content=Expressions_8.html.
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Looking at the openbd source code, the remote_user and the auth_user are mapped to the same key, so it returns the same value..
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Looking at the railo source code, I'm not quite understanding what is going on, but it appears to be setting remote_user, and I'm not sure if auth_user is being set anywhere..
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If you are designing an app that is compatible with coldfusion, railo, and openbd, it appears safer to use remote_user.


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Maybe someone else can comment because I don't fully understand the code without taking the time to investigate deeply..


2:


REMOTE_USER and AUTH_USER will be the same in AdobeCF/IIS, but not on AdobeCF/Apache.

AUTH_USER will be blank when using AdobeCF/Apache.

. So it is best to code using the REMOTE_USER variable.

If you find yourself working on code that references AUTH_USER in Apache, there is a way to make Apache populate that variable using mod_rewrite.

This will cause Apache to copy REMOTE_USER into AUTH_USER:. RewriteEngine on RewriteCond %{REMOTE_USER} (.) RewriteRule . - [E=AUTH_USER:%1]. There is more info here: http://www.stillnetstudios.com/copying-env-variables-in-apache/.


3:


I'm fairly sure REMOTE_USER is the standard CGI variable.. According to this page, they are the same: http://livedocs.adobe.com/coldfusion/6/CFML_Reference/Expressions5.htm.


4:


to be on the safe side stick to REMOTE_USER as it is the one defined in the CGI/1.0 spec (Found here http://www.ietf.org/rfc/rfc3875). AUTH_USER seems to have snuck in over time.


5:


In my experience, CGI variables tend to differ between Web Servers (Apache, IIS, JRun, etc), and even between their versions.

The only safe bet, when basing something on a CGI variable, is to check what values show up on your dev, stage, production (etc) servers..



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