server: Parse port numbers from MCP server URLs in CORS proxy (#20208)

* Parse port numbers from MCP server URLs

* Pass scheme to http proxy for determining whether to use SSL

* Fix download on non-standard port and re-add port to logging

* add test

---------

Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/server/server-cors-proxy.h

@@ -30,12 +30,13 @@ static server_http_res_ptr proxy_request(const server_http_req & req, std::strin
         throw std::runtime_error("unsupported URL scheme in target URL: " + parsed_url.scheme);
     }
 
-    SRV_INF("proxying %s request to %s://%s%s\n", method.c_str(), parsed_url.scheme.c_str(), parsed_url.host.c_str(), parsed_url.path.c_str());
+    SRV_INF("proxying %s request to %s://%s:%i%s\n", method.c_str(), parsed_url.scheme.c_str(), parsed_url.host.c_str(), parsed_url.port, parsed_url.path.c_str());
 
     auto proxy = std::make_unique<server_http_proxy>(
             method,
+            parsed_url.scheme,
             parsed_url.host,
-            parsed_url.scheme == "http" ? 80 : 443,
+            parsed_url.port,
             parsed_url.path,
             req.headers,
             req.body,