[Question] Shall we follow the behavior of the document of http.ResponseWriter?

[kvii]

I think it's necessary to follow the behavior of the document of http.ResponseWriter. It's hard to explain "why". But you can see this repo.

[dosubot]

🤖

Hey @kvii! Great to see you diving into the depths again. 🐙

Based on the context provided, it seems that the Kratos codebase does indeed follow the behavior of the http.ResponseWriter as documented in the Go standard library. This is evident in several places in the codebase, such as the h function, the handleFuncWrapper struct, and the BenchmarkServer function, where http.ResponseWriter is used to encode the response into JSON format, serve HTTP, and write the HTTP status code, respectively.

Here are the relevant code snippets:

var h = func(w http.ResponseWriter, r *http.Request) {
	_ = json.NewEncoder(w).Encode(testData{Path: r.RequestURI})
}

type handleFuncWrapper struct {
	fn http.HandlerFunc
}

func (x *handleFuncWrapper) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
	x.fn.ServeHTTP(writer, request)
}

fn := func(w http.ResponseWriter, r *http.Request) {
	data := &testData{Path: r.RequestURI}
	_ = json.NewEncoder(w).Encode(data)
	if r.Context().Value(testKey{}) != "test" {
		w.WriteHeader(500)
	}
}

These examples show that the Kratos codebase uses the http.ResponseWriter to write the HTTP response, which is consistent with the behavior of the http.ResponseWriter as documented in the Go standard library.

As for the specific behavior of http.ResponseWriter as documented in the Go standard library, it is an interface that has methods for responding to an HTTP request. It is used to send data in response to an HTTP request. The specific behavior of http.ResponseWriter in the provided context is used in the ServeHTTP method of the Server struct.

// ServeHTTP should write reply headers and data to the ResponseWriter and then return.
func (s *Server) ServeHTTP(res http.ResponseWriter, req *http.Request) {
	s.Handler.ServeHTTP(res, req)
}

In this method, the http.ResponseWriter (res) is passed along with the http.Request (req) to the Handler's ServeHTTP method. This means that the response to the HTTP request will be written by the Handler's ServeHTTP method.

However, the specific behavior of http.ResponseWriter is not detailed in the provided context. For a complete understanding of its behavior, you would need to refer to the Go standard library documentation. According to the Go standard library, http.ResponseWriter has the following methods:

• Header() Header: This returns the header map that will be sent by WriteHeader.
• Write([]byte) (int, error): This writes the data to the connection as part of an HTTP reply.
• WriteHeader(statusCode int): This sends an HTTP response header with the provided status code.

Reference: Go standard library documentation

I hope this answers your question. If you need further clarification, please let me know.

Sources

• transport/http/server_test.go
• transport/http/server.go

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