redirectmatch changes post to get

Question

I have two separated vhost. On the www. one, I have instaled this only line on .htaccess

redirectMatch 301 ^(.*)$ http://d_blur_blur_s.com$1

All works as expected except that in the case where the POST is converted to GET.
Please notice that the post has parametres as a get (i didn't do it, and I won't change it) i am just trying to avoid duplicated content. I am showing firebug trace.

I expect to have the POST redirected on the main domain with redirectmatch or other trick.

Update
I have half of the internal links on the site written with www and the other half without it. So I need to keep both public but not duplicated. I need the GETs forwarded as GETs and the POSTs frowarded as POSTs. the problem is big, I have 12000 pages indexed, and lot of forms. So I am first searching for a generic solution without changing code. I full control de server.

Thanks a lot

Answer 1

A redirect response from your server for whatever request you made, regardless of it being POST or GET request, always results in your client making a GET request (unless you somehow enable it to NOT automatically follow redirects--sometimes I do this with curl, but I don't know any widely used browsers with this functionality available easily to the user). The client browser takes the URL provided by the redirect and treats it as a URL to perform a GET request. No way around it, the POST data is discarded by the server since it was intended for the server resource at the original URL.

If you redirect outside of .htaccess, say in a PHP file to construct redirect response, your only option is to convert the POST parameters into a string of GET parameters and add it to the end of the URL you send back to the client with your redirect response.

I'm fairly confident there is not a way to do automatic POST parameter appending to redirect in the .htaccess file or in the httpd.conf files whether you use the redirect directive or the rewrite directive via the mod_rewrite module.

Answer 2

The only way to do a redirect and preserve POST data (that I am aware of) is to use mod_rewrite with mod_proxy and then use P flag in RewriteRule.

On your www host enable mod_rewrite, mod_rewrite and .htaccess through httpd.conf and then put this code in your .htaccess under DOCUMENT_ROOT directory:

Options +FollowSymLinks -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /

RewriteRule ^ http://d_blur_blur_s.com%{REQUEST_URI} [P]

Answer 3

You redirect using 307 instead of 301 to keep the post data, but some browsers show a dialog to the user if he is sure he want to sent the post data, so not real pretty.

But I'd rather go and fix the problem at the root. The only way you would get a post to the wrong domain is if the html-form refers to the wrong domain (e.g. <form action="www.d_blur_blur_s/public/main/loginGenerator.php" ...). Just fix the html.

Don't worry about duplicated content as search engines never send post-requests, only get. You current solution should do the trick to prevent duplicated content.