RewriteCond comparing two variables in Apache htaccess

Question

I would like to have a rewritecond that gets true if two variables HTTP_ORIGIN and HTTP_HOST are equals. I tried

Answer 1

In RewriteCond you cannot use a variable on right hand side.

You have to use it like this:

RewriteCond %{HTTP_HOST}##%{HTTP:Origin} ^(.+)##http://\1(/|$)

Here are are joining 2 variables using a delimiter ## (it can be anything). Then on RHS we match and capture value before ## that represents HTTP_HOST. After ## using a back-reference \1 we do our matching.