Get POST Data from TIdHTTPProxyServer

Question

I'm trying to get the post data from TIdHTTPProxyServer, using OnHTTPBeforeCommand or OnHTTPDocument events but all is useless. How can I do that?

BTW, I'm using Indy 10, but other solutions (with synapse, for example) will be cool.

Thanks in advance.

Answer 1

POST data is not available in the OnHTTPBeforeCommand event, as it has not been read from the socket yet. Only the HTTP headers are available in that event.

POST data is available in the OnHTTPDocument event, but only under the following conditions:

1. the POST request uses a non-zero Content-Length header (as TIdHTTPProxyServer does not yet support the Transfer-Encoding header to handle compressed/chunked HTTP messages).

2. the TIdHTTPProxyServerContext.TransferMode property is tmFullDocument when the OnHTTPBeforeCommand event exits. By default, the TransferMode is set to the same value as the TIdHTTPProxyServer.DefaultTransferMode property, which is tmFullDocument by default.

3. the client sends the POST request directly to TIdHTTPProxyServer, specifying a full URL as the target. If the client instead sends a CONNECT request directly to TIdHTTPProxyServer to establish a tunnel to the target server and then sends the POST request through the tunnel to the target server (for instance, when establishing SSL sessions for HTTPS requests), TIdHTTPProxyServer does not expose access to that data. It is a straight pass-through from one socket to another.