I am trying to proxy a subdirectory to another server. My httpd.conf:

    RewriteEngine On
    ProxyPreserveHost On
    RewriteRule .*subdir/ https://anotherserver/subdir/ [P]

The problem is that Apache is always logging this:

    AH01144: No protocol handler was valid for the URL /subdir/. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule., referer: http://localhost/

So after searching the internet, I have activated these modules:

    LoadModule headers_module modules/mod_headers.so
    LoadModule proxy_module modules/mod_proxy.so
    LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
    LoadModule proxy_connect_module modules/mod_proxy_connect.so
    LoadModule proxy_express_module modules/mod_proxy_express.so
    LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so
    LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
    LoadModule proxy_html_module modules/mod_proxy_html.so
    LoadModule proxy_http_module modules/mod_proxy_http.so
    LoadModule proxy_scgi_module modules/mod_proxy_scgi.so
    LoadModule proxy_wstunnel_module modules/mod_proxy_wstunnel.so
    LoadModule rewrite_module modules/mod_rewrite.so

(I know that I don&#39;t need all of them but I just activated them to be sure I am not missing one)

But this error still appears and clients get a HTTP 500.

How can I fix this?

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Apache Proxy: No protocol handler was valid