- Qt 5.15
- Qt WebEngine
- C++ Classes
- QWebEngineUrlSchemeHandler
- Qt 5.15.19 Reference Documentation

# QWebEngineUrlSchemeHandler Class

The QWebEngineUrlSchemeHandler class is a base class for handling custom URL schemes. More...

Header: | #include <QWebEngineUrlSchemeHandler>
Since: | Qt 5.6
Inherits: | QObject

This class was introduced in Qt 5.6.

- List of all members, including inherited members

## Public Functions

| QWebEngineUrlSchemeHandler(QObject *parent = Q_NULLPTR)
virtual | ~QWebEngineUrlSchemeHandler()
virtual void | requestStarted(QWebEngineUrlRequestJob *request) = 0

## Detailed Description

To implement a custom URL scheme for QtWebEngine, you first have to create an instance of QWebEngineUrlScheme and register it using QWebEngineUrlScheme::registerScheme().

Note: Make sure that you create and register the scheme object before the QGuiApplication or QApplication object is instantiated.

Then you must create a class derived from QWebEngineUrlSchemeHandler, and reimplement the requestStarted() method.

Finally, install the scheme handler object via QWebEngineProfile::installUrlSchemeHandler() or QQuickWebEngineProfile::installUrlSchemeHandler().

     class MySchemeHandler : public QWebEngineUrlSchemeHandler
     {
     public:
         MySchemeHandler(QObject *parent = nullptr);
         void requestStarted(QWebEngineUrlRequestJob *request)
         {
             // ....
         }
     };

     int main(int argc, char **argv)
     {
         QWebEngineUrlScheme scheme("myscheme");
         scheme.setSyntax(QWebEngineUrlScheme::Syntax::HostAndPort);
         scheme.setDefaultPort(2345);
         scheme.setFlags(QWebEngineUrlScheme::SecureScheme);
         QWebEngineUrlScheme::registerScheme(scheme);

         // ...
         QApplication app(argc, argv);
         // ...

         // installUrlSchemeHandler does not take ownership of the handler.
         MySchemeHandler *handler = new MySchemeHandler(parent);
         QWebEngineProfile::defaultProfile()->installUrlSchemeHandler("myscheme", handler);
     }

See also QWebEngineUrlScheme and WebEngine Widgets WebUI Example.

## Member Function Documentation

### QWebEngineUrlSchemeHandler::QWebEngineUrlSchemeHandler(QObject *parent = Q_NULLPTR)

Constructs a new URL scheme handler.

The handler is created with the parent parent.

### `[virtual]` QWebEngineUrlSchemeHandler::~QWebEngineUrlSchemeHandler()

Deletes a custom URL scheme handler.

### `[pure virtual]` void QWebEngineUrlSchemeHandler::requestStarted(QWebEngineUrlRequestJob *request)

This method is called whenever a request request for the registered scheme is started.

This method must be reimplemented by all custom URL scheme handlers. The request is asynchronous and does not need to be handled right away.

See also QWebEngineUrlRequestJob.