LoadModule headers_module modules/mod_headers.so

But what I *really* wanted was a way to print out the variables while accessing my problematic reference. That is, this prints out the variables using a specific URL request. Namely, test/index.php … or whatever the name given to it was. But I want to see what’s going on for the specific URL I am trying to debug. Is there a way from within the .htaccess file ALONE that I can print out the various variables?

Actually HTTP_ACCEPT_LANGUAGE, HTTP_ACCEPT, HTTP_HOST, HTTP_COOKIE, and a couple more variables are created by apache just for later referencer. In fact, HTTP_ACCEPT_LANGUAGE is an alias of %{HTTP:Accept-Language}, but note that the %HTTP array holds the actual header strings, and some processing is done on it to create the HTTP_ variables. you can actualy access ANY header with the %HTTP variable, which is very neat because you can use that and the RequestHeader directive as a data-channel/proxy… its crazy!

RewriteRule .* - [E=INFO_UNIQUE_ID:%{UNIQUE_ID},NE]
RequestHeader set INFO_API_VERSION "%{INFO_API_VERSION}e"

I didn’t explain in my post but basically this lets you examine the incoming request headers from the user (like Accept-Language) and then MODIFY their request headers before apache sees it. So if I were you I would perform regex on their incoming accept-language header, then modify their actual request to the real asset.

I also found that %{HTTP_ACCEPT_LANGUAGE} in .htaccess files for making multilingual websites doesn’t work. However there is other way to read browser setting of prefferred language in order to make a localization of the site using Apache mod rewrite.

Fortunately we can access every header sent by the browser using %{HTTP:header}, so the solution is not %{HTTP_ACCEPT_LANGUAGE} but: %{HTTP:Accept-Language}. I write more about this on my blog post: mod rewrite and HTTP_ACCEPT_LANGUAGE

Is there some configuration in my config file I need to do to allow RequestHeader code in .htaccess?

$r)
{
  if(substr($v,0,9)=='HTTP_INFO')
  {
    if(!empty($r))$INFO[substr($v,10)]=$r;
    else $MISS[substr($v,10)]=$r;
  }
}
 
/* thanks Mike! */
ksort($INFO);
ksort($MISS);
ksort($_SERVER);
 
echo "Received These Variables:\n";
print_r($INFO);
 
echo "Missed These Variables:\n";
print_r($MISS);
 
echo "ALL Variables:\n";
print_r($_SERVER);

However, the <?php is still being interpreted. The web page only lists from $r) onward. Maybe it’s my firefox browser?