feat: add HTTP_STATUS_CLOSE to support (#816)

[ithewei]

No description provided.

[Copilot]

Pull request overview

Adds a new handler return code to allow HTTP handlers to immediately close the client connection without sending any HTTP response, and wires that behavior into the server-side request handling flow.

Changes:

• Introduce HTTP_STATUS_CLOSE (=-100) as a new handler return value alongside HTTP_STATUS_NEXT.
• Update HttpHandler to transition to WANT_CLOSE when HTTP_STATUS_CLOSE is returned (header handler and request handling path).
• Add an example route (/close) demonstrating connection-close-without-response behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
http/server/HttpService.h	Documents and defines the new HTTP_STATUS_CLOSE handler return code.
http/server/HttpHandler.cpp	Implements runtime handling of HTTP_STATUS_CLOSE by switching handler state to WANT_CLOSE.
examples/http_server_test.cpp	Adds a /close endpoint demonstrating the new behavior.

Comments suppressed due to low confidence (1)

http/server/HttpHandler.cpp:493

• status_code is overwritten with the return value from errorHandler. This is a behavioral change from the previous implementation (which ignored the return value) and can break error handling if a custom errorHandler returns HTTP_STATUS_NEXT/0 (or any non-HTTP status) after populating resp—the server will treat it as “continue” and skip sending the error response. Consider preserving the original HTTP status unless the handler explicitly returns a valid HTTP status (100–599) or HTTP_STATUS_CLOSE (and never allowing HTTP_STATUS_CLOSE to be overridden).

        if (pResp->status_code >= 400 && pResp->body.size() == 0 && pReq->method != HTTP_HEAD) {
            if (service->errorHandler) {
                status_code = customHttpHandler(service->errorHandler);
            } else {
                defaultErrorHandler();
            }
        }

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