Merge remote-tracking branch 'origin' into 7.0.x

samples/server/petstore/go-api-server/api/openapi.yaml

@@ -47,6 +47,9 @@ paths:
       - pet
     put:
       description: ""
+      externalDocs:
+        description: API documentation for the updatePet operation
+        url: http://petstore.swagger.io/v2/doc/updatePet
       operationId: updatePet
       requestBody:
         $ref: '#/components/requestBodies/Pet'
@@ -348,7 +351,7 @@ paths:
       - store
     get:
       description: For valid response try integer IDs with value <= 5 or > 10. Other
-        values will generated exceptions
+        values will generate exceptions
       operationId: getOrderById
       parameters:
       - description: ID of pet that needs to be fetched

samples/server/petstore/go-api-server/go/routers.go

@@ -76,7 +76,11 @@ func EncodeJSONResponse(i interface{}, status *int, headers map[string][]string,
 		w.WriteHeader(http.StatusOK)
 	}
 
-	return json.NewEncoder(w).Encode(i)
+	if i != nil {
+		return json.NewEncoder(w).Encode(i)
+	}
+
+	return nil
 }
 
 // ReadFormFileToTempFile reads file data from a request form and writes it to a temporary file
@@ -167,7 +171,15 @@ func parseInt32Parameter(param string, required bool) (int32, error) {
 }
 
 // parseBoolParameter parses a string parameter to a bool
-func parseBoolParameter(param string) (bool, error) {
+func parseBoolParameter(param string, required bool) (bool, error) {
+	if param == "" {
+		if required {
+			return false, errors.New(errMsgRequiredMissing)
+		}
+
+		return false, nil
+	}
+
 	val, err := strconv.ParseBool(param)
 	if err != nil {
 		return false, err
@@ -222,4 +234,4 @@ func parseInt32ArrayParameter(param, delim string, required bool) ([]int32, erro
 	}
 
 	return ints, nil
-}
+}