rewrite with post method

I wrote a Web Server and I use Apache WebServer too.
I want to redirect all http requests from my Apache WebServer to te second Server.

In httpd.conf I wrote:
<VirtualHost myserver:80>
ServerName myservername
RewriteEngine on
RewriteRule ^(.*) URL$1 [R,L]
</VirtualHost>

And it works :-)
When I send for example GET /param1=value1&param2=value2 http/1.1 to apache, my web server receive GET /param1=value1&param2=value2

But the problem is with post request
when I send a form
POST / http/1.1
.....
param1=value1
param2=value2

Apache receive the correct request but my server web receive
GET / http/1.1 and it's all !!
I need the parameters param1 et param2
how can I do that ?
Thanks.

>> But the problem is with post request

Because RewriteRule ^(.*) http://IpServer:8080$1 [R,L] uses GET method at all time.

If IpServer is on the same server as myserver, use internal redirect. However, your RewriteRule ^(.*) tells me you are doing this for entire mydomain site, so you can also use proxy in mod_rewrite.

Do a search in this forum as this has been discussed several times. Try keywords like: internal redirect, proxy or etc. under my username.

I searched et found severals threads about my problem but I don't quite understand.
Can you give me the correct code to include in httpd.conf file so that my WebServer could receive datas from post methods
thanks.