get $REMOTE_USER .htaccess

if im running a cgi, i can get a var-env $REMOTE_USER and know the user login name... but how the experts-exchange's site put(get) my login name in their page??? how does it get my name using HTML??

   cox [edit], etc, etc
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coxAsked:
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yorenConnect With a Mentor Commented:
Cox,

The cool thing about CGI is that anything you print out gets sent back to the browser. So, just include the variable in your CGI as part of the HTML you return. Here's an example CGI in Perl:

print "Content-type: text/html\n\n";
print <<ENDOFTEXT;

<HTML>
<HEAD><TITLE>Ekspert Ekschange</TITLE></HEAD>
<BODY><H1>
ENDOFTEXT

# Did we get a REMOTE_USER environment variable?
if ($ENV{'REMOTE_USER'}) { #yes
  print "Logged in as $ENV{'REMOTE_USER'}";
}
else { #no
  print "Not logged in.";
}

print "\n</H1></BODY></HTML>\n";


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PBallCommented:
how the experts-exchange's site put my login name in your site using HTML format???

huh?

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coxAuthor Commented:
Edited text of question
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coxAuthor Commented:
Edited text of question
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coxAuthor Commented:
i want know if this site uses only cgis in their pages... because im reading the file htttp://www.experts-exchange.com/topic/index.htm for example, and the variable is showed....
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martinagCommented:
Check out Q.10109635.

Martin
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yorenCommented:
My guess is that the entire Expert's Exchange web site is run by CGI's (or other similar technology, like NSAPI, etc.). You can bet that even though you're specifying index.htm, you're not reading a plain HTML file. Something gave you a dynamic page. A CGI program can do this by reading the PATH_INFO environment variable, which would contain "/topic/index.html". The CGI would then parse this and understand that this path means it should display the main topic page.

There are several other technologies that can do this instead of CGI, but they all are similar in concept. A program gets the equivalent of CGI's REMOTE_USER value and returns a dynamic page.

If you want to avoid the overhead of CGI (which runs a new process for every hit), you can look into Microsoft's ISAPI, Netscape's NSAPI, or Sun's Servlet API. These all load your CGI-like program into memory and then just spawn a thread for each hit. Much more efficient.

Yuval
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