Is there any way to access HTTP headers in ISAPI_Rewrite module? Didn't find anything about it. I know IIS URL Rewrite allows you to access headers as server variables - {HTTP_HEADER_NAME} - is there something similar here?
Uh, nevermind...
Missed a line in a documentation:
HTTP header value with the syntax %{HTTP:header}.
http://www.helicontech.com/isapi_rewrite/doc/RewriteCond.htm