问题
Recently, I found that IdHTTPProxyServer automatically changes all HTTP/1.1 requests to HTTP/1.0 requests. It is a little bit weird for me as I think a proxy server should not change the HTTP version. Is there any way I can force the proxy server to not change HTTP version?
回答1:
TIdHTTPProxyServer does not support HTTP 1.1 at this time. The behavior that changes the HTTP version is hard-coded, as TIdHTTPProxyServer is not actually passing through the client's request as-is, but is sending its own HTTP 1.0 request that contains the client's requested data in it. The only way you can change that is to edit IdHTTPProxyServer.pas and then recompile Indy.
来源：https://stackoverflow.com/questions/11612459/why-does-idhttpproxyserver-change-the-http-version-of-requests