Function Errorf

lib/httpserver/httpserver.go:654–679

Errorf writes formatted error message to w and to logger.

(w http.ResponseWriter, r *http.Request, format string, args ...any)

// Errorf writes formatted error message to w and to logger.
func Errorf(w http.ResponseWriter, r *http.Request, format string, args ...any) {
	errStr := fmt.Sprintf(format, args...)
	remoteAddr := GetQuotedRemoteAddr(r)
	requestURI := GetRequestURI(r)
	errStr = fmt.Sprintf("remoteAddr: %s; requestURI: %s; %s", remoteAddr, requestURI, errStr)
	logger.WarnfSkipframes(1, "%s", errStr)

	// Extract statusCode from args
	statusCode := http.StatusBadRequest
	var esc *ErrorWithStatusCode
	for _, arg := range args {
		if err, ok := arg.(error); ok && errors.As(err, &esc) {
			statusCode = esc.StatusCode
			break
		}
	}

	if rwa, ok := w.(*responseWriterWithAbort); ok && rwa.sentHeaders {
		// HTTP status code has been already sent to client, so it cannot be sent again.
		// Just write errStr to the response and abort the client connection, so the client could notice the error.
		fmt.Fprintf(w, "\n%s\n", errStr)
		rwa.abort()
		return
	}
	http.Error(w, errStr, statusCode)
}

// ErrorWithStatusCode is error with HTTP status code.
//