Add REQUEST_TIMEOUT handler error type

Author: bergundy

nexus/api.go

@@ -180,6 +180,10 @@ const (
 	// The requested resource could not be found but may be available in the future. Clients should not retry
 	// this request unless advised otherwise.
 	HandlerErrorTypeNotFound HandlerErrorType = "NOT_FOUND"
+	// Returned by the server to when it has given up handling a request. The may occur by enforcing a client
+	// provided `Request-Timeout` or for any arbitrary reason such as enforcing some configurable limit. Subsequent
+	// requests by the client are permissible.
+	HandlerErrorTypeRequestTimeout HandlerErrorType = "REQUEST_TIMEOUT"
 	// The request could not be made due to a conflict. The may happen when trying to create an operation that
 	// has already been started. Clients should not retry this request unless advised otherwise.
 	HandlerErrorTypeConflict HandlerErrorType = "CONFLICT"

nexus/client.go

@@ -460,6 +460,8 @@ func httpStatusCodeToHandlerErrorType(response *http.Response) (HandlerErrorType
 	switch response.StatusCode {
 	case http.StatusBadRequest:
 		return HandlerErrorTypeBadRequest, nil
+	case http.StatusRequestTimeout:
+		return HandlerErrorTypeRequestTimeout, nil
 	case http.StatusConflict:
 		return HandlerErrorTypeConflict, nil
 	case http.StatusUnauthorized:

nexus/server.go

@@ -308,6 +308,8 @@ func (h *baseHTTPHandler) writeFailure(writer http.ResponseWriter, err error) {
 		switch handlerError.Type {
 		case HandlerErrorTypeBadRequest:
 			statusCode = http.StatusBadRequest
+		case HandlerErrorTypeRequestTimeout:
+			statusCode = http.StatusRequestTimeout
 		case HandlerErrorTypeConflict:
 			statusCode = http.StatusConflict
 		case HandlerErrorTypeUnauthenticated: