Terminating HTTP Request Processing
When serving HTTP requests, there may be scenarios where it becomes necessary to terminate the processing and send an error response. This can be achieved by returning from the ServeHTTP() method.
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { // Inspect incoming parameters if !IsValid(r.URL.Query()) { str := `{"Result":"","Error":"Invalid Parameters"}` fmt.Fprint(w, str) return } // Continue normal API processing })
Using HTTP Error Codes
For more sophisticated error handling, it's recommended to return an appropriate HTTP error code instead of the default 200 OK.
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { // Inspect incoming parameters if !IsValid(r.URL.Query()) { http.Error(w, "Invalid Parameters", http.StatusBadRequest) return } // Continue normal API processing })
JSON-Formatted Error Responses
To provide a more detailed error response in JSON format:
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { // Inspect incoming parameters if !IsValid(r.URL.Query()) { w.Header().Set("Content-Type", "application/json") w.WriteHeader(http.StatusBadRequest) str := `{"Result":"","Error":"Invalid Parameters"}` fmt.Fprint(w, str) return } // Continue normal API processing })
Propagating Errors from Nested Functions
If error handling is performed in a function called from ServeHTTP(), the error state must be returned to allow ServeHTTP() to terminate the request processing:
func decodeParams(r *http.Request) (*params, error) { p := new(params) // Decode parameters and check their validity if !ok { return nil, errors.New("Invalid Parameters") } return p, nil } func handleRequest(w http.ResponseWriter, r *http.Request) { p, err := decodeParams(r) if err != nil { http.Error(w, err.Error(), http.StatusBadRequest) return } // Continue normal API processing }
The above is the detailed content of How to Gracefully Handle and Terminate HTTP Request Processing in Go?. For more information, please follow other related articles on the PHP Chinese website!

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