Qt 5.11 | Qt WebEngine | C++ Classes | QWebEngineUrlRequestJob

Qt 5.11.3 Reference Documentation

# QWebEngineUrlRequestJob Class

The QWebEngineUrlRequestJob class represents a custom URL request. More...

Header: | #include <QWebEngineUrlRequestJob>
Since: | Qt 5.6

- List of all members, including inherited members

## Public Types

enum | Error { NoError, UrlNotFound, UrlInvalid, RequestAborted, RequestDenied, RequestFailed }

## Public Functions

void | fail(QWebEngineUrlRequestJob::Error r)
QUrl | initiator() const
void | redirect(const QUrl &url)
void | reply(const QByteArray &contentType, QIODevice *device)
QByteArray | requestMethod() const
QUrl | requestUrl() const

## Detailed Description

The QWebEngineUrlRequestJob class represents a custom URL request.

A QWebEngineUrlRequestJob is given to QWebEngineUrlSchemeHandler::requestStarted() and must be handled by the derived implementations of the class. The job can be handled by calling either reply(), redirect(), or fail().

The class is owned by the web engine and does not need to be deleted. However, the web engine may delete the job when it is no longer needed, and therefore the signal QObject::destroyed() must be monitored if a pointer to the object is stored.

## Member Type Documentation

### enum QWebEngineUrlRequestJob::Error

This enum type holds the type of the error that occurred:

Constant | Value | Description
--- | --- | ---
`QWebEngineUrlRequestJob::NoError` | `0` | The request was successful.
`QWebEngineUrlRequestJob::UrlNotFound` | `1` | The requested URL was not found.
`QWebEngineUrlRequestJob::UrlInvalid` | `2` | The requested URL is invalid.
`QWebEngineUrlRequestJob::RequestAborted` | `3` | The request was canceled.
`QWebEngineUrlRequestJob::RequestDenied` | `4` | The request was denied.
`QWebEngineUrlRequestJob::RequestFailed` | `5` | The request failed.

## Member Function Documentation

### void QWebEngineUrlRequestJob::fail(QWebEngineUrlRequestJob::Error r)

Fails the request with the error r.

See also Error.

### QUrl QWebEngineUrlRequestJob::initiator() const

Returns the serialized origin of the content that initiated the request.

Generally, the origin consists of a scheme, hostname, and port. For example, `"http://localhost:8080"` would be a valid origin. The port is omitted if it is the scheme's default port (80 for `http`, 443 for `https`). The hostname is omitted for non-network schemes such as `file` and `qrc`.

However, there is also the special value `"null"` representing a unique origin. It is, for example, the origin of a sandboxed iframe. The purpose of this special origin is to be always different from all other origins in the same-origin check. In other words, content with a unique origin should never have privileged access to any other content.

Finally, if the request was not initiated by web content, the function will return an empty QUrl. This happens, for example, when you call QWebEnginePage::setUrl().

This value can be used for implementing secure cross-origin checks.

This function was introduced in Qt 5.11.

### void QWebEngineUrlRequestJob::redirect(const QUrl &url)

Redirects the request to url.

### void QWebEngineUrlRequestJob::reply(const QByteArray &contentType, QIODevice *device)

Replies to the request with device and the MIME type contentType.

The user has to be aware that device will be used on another thread until the job is deleted. In case simultaneous access from the main thread is desired, the user is reponsible for making access to device thread-safe for example by using QMutex. Note that the device object is not owned by the web engine. Therefore, the signal QObject::destroyed() of QWebEngineUrlRequestJob must be monitored.

The device should remain available at least as long as the job exists. When calling this method with a newly constructed device, one solution is to make the device as a child of the job or delete itself when job is deleted, like this:

      connect(job, &QObject::destroyed, device, &QObject::deleteLater);

### QByteArray QWebEngineUrlRequestJob::requestMethod() const

Returns the HTTP method of the request (for example, GET or POST).

### QUrl QWebEngineUrlRequestJob::requestUrl() const

Returns the requested URL.