After the test " if empty response or bad response, return original ip ", you have to add a test to verify that the last character of the response is a 0 :

// Verify the last character of response is 0
$responseLength = hexdec(bin2hex(substr( $response, $requestsize + 11, 1 )));
if ( bin2hex(substr( $response, $requestsize + $responseLength + 11, 1 )) != '00' ) {
return $ip;
}

if ( empty( $response ) || bin2hex( substr( $response, $requestsize + 2, 2 ) ) != '000c' || bin2hex( substr( $response, $requestsize + 12, 1 ) ) != '02' ) {

return $ip;

}

It will always be interesting to read through content from other authors and practice
a little something from other websites.

Does SPF helped you to avoid Spam folder when sending messages?

Thanks.

Example:

Client—————————–ReverseProxy—————————-Internal
 
—https://ReverseProxy/foo—>
—http://Internal/foo—>
<—303: "http://internal/bar"—
<—http://ReverseProxy/bar—

Note that to the client, the connection method has changed from https to http. It seems that apache's ProxyPassReverse directive does not understand that the connection method needs to remain https (despite living inside of a virtualhost on port 443 with SSLEngine On).

Do you have any ideas how to force ProxyPassReverse to always return https to the client?