keep-alive Connections with RewriteRule [P]

["Reif Peter" <peter.reif@xxxxxxxxxx>]

I habe a reverse proxy apache that connects to a backend apache server.
I want that the proxy uses keep alive connections to the backend server.
When I use ProxyPass, it works. When I use RewriteRule ... [P] the
reverse proxy makes a new connection for each request. I have a very
complex configuration, so I have to use RewriteRule. I tried to use

<Proxy http://my.backend/>
    ProxySet keepalive=On
</Proxy>

but then I get:

ProxySet can not find 'http://my.backend/' Worker.

Is there a solution?

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