.htaccess redirect to external URL while hiding redirect [duplicate]

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.htaccess redirect to external URL while hiding redirect

Is there a way to rewrite to an external site while hiding the new address?

RewriteRule (.*) http://www.second-website.com/index.php\?string=$1 [NC,L]

The rule works perfectly for a page on the same server, but on a different server it changes the address as if I had used [L,R=301].

EDIT: I am using a reverse proxy, but getting a 500 error.

ProxyRequests Off

<Proxy *>
Order deny,allow
Allow from all
</Proxy>

ProxyPass /foo http://www.second-website.com/foo
ProxyPassReverse /foo http://www.second-website.com/foo

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Looks like you need a reverse proxy. It can be implemented in Apache using mod_proxy. You can use the P flag if you already have a RewriteRule.