Expected behaviour

A request to a insecure (HTTP) web server returns a response when the connection is proxied.

Actual behaviour

A request to a insecure (HTTP) web server returns an empty response when the connection is proxied.

< HTTP/1.1 200 Connection established < * Proxy replied 200 to CONNECT request * CONNECT phase completed! > POST /api/hello HTTP/1.1 Host: localhost User-Agent: restclient-cpp/0.5.2 Accept: */* Content-Type: application/json Content-Length: 172 * Empty reply from server * Closing connection 0 

The proxy server is not configured to accept HTTP CONNECT requests on port 80 (AFAICT). I will need to confirm, but either the option to disable the tunnel (CURLOPT_HTTPPROXYTUNNEL) or detect a secure (HTTPS) connection and enabled it when necessary will resolve this issue.