Need help with Xmlrpc over https

Hello everybody, I need some help with Xmlrpc over https.

When I try to send a request to the server, I get this error

"Did not receive a '200 OK' response from remote server. (HTTP/1.1 302 Found)"


I think that this happens because of my htaccess, which is

RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://mydomain.com/$1 [R,L]

I use this htaccess configuration because I want to force every request over https instead of http. Can this be the root cause of my problem? There's a way to avoid https rewrite if the request is already sent over https?