accumulate the total bytes received from client requests using r->request_length #1998
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The $request_length variable records only the size of the request line and headers during the CONNECT method in this module, and does not include the TLS handshake or request body bytes transmitted after the tunnel is established.
In the code, the subsequent bytes read from the client are added to r->request_length, allowing observation of the total packet size sent by clients in forward proxy requests via the $request_length field in logs.