Set Apache headers conditionally

Question

I'm working with an apache server, and I'd like to add headers conditionally.

If the URI matches a certain regex, I'd like to add the header Access-Control-Allow-Origin: *. What is a good way to do this?

What I've tried so far:

1. I added code called by the request handler, using apr_table_add(rq->headers_out, "Access-Control-Allow-Origin", "*"). But it seems like Apache strips the header before sending the response whenever the header Content-Type: application/x-javascript is also set. Is this the wrong way to do it? Why would Apache strip the header?

2. I've heard mod_headers suggested. Does mod_headers have the capability to place headers based on regex matching with the request URI?

Answer 1

SetEnvIf Request_URI somepartofurl SIGN
Header always add "Access-Control-Allow-Origin" "*" env=SIGN

but this works only if located in the configuration. Placing it into .htaccess won't help.

Answer 2

This should also work (mod_rewrite is required):

RewriteRule ^/en/foo.*$ - [ENV=SET_ACAO:true]
Header set "Access-Control-Allow-Origin" "*" env=SET_ACAO

where ^/en/foo.*$ a regex which is matched against request URL