Qt 6 是努力使框架更高效，且更易於使用的結果。
為兼容每個發行的所有公共 API，我們試著維護二進製和源代碼。但是，為使 Qt 成為更優框架，一些改變是不可避免的。
本主題匯總瞭 Qt Network 的這些變化，並提供處理它們的指導。
移除瞭幾個有歧義的重載函數。以 errorOccurred() 替換 error() 信號在 QAbstractSocket 及其繼承者 ( QTcpSocket , QUdpSocket , QLocalSocket ，和 QSslSocket )，和在 QNetworkReply 。代碼譬如：
connect(socket, qOverload<QAbstractSocket::SocketError>(&QAbstractSocket::error), this, &SomeClass::errorSlot);
因此必須改為：
connect(socket, &QAbstractSocket::errorOccurred, this, &SomeClass::errorSlot);
在 QSslSocket , the function that returns a list of errors encountered during the TLS handshake:
QList<QSslError> sslErrors() const;
被重命名為 sslHandshakeErrors()：
const auto tlsErrors = socket.sslHandshakeErrors();
類 QNetworkConfiguration 和 QNetworkConfigurationManager 在 Qt 6 被移除。因此，下列成員函數對於 QNetworkAccessManager 也被移除：
void setConfiguration(const QNetworkConfiguration &config); QNetworkConfiguration configuration() const; QNetworkConfiguration activeConfiguration() const; void setNetworkAccessible(NetworkAccessibility accessible); NetworkAccessibility networkAccessible() const; void networkSessionConnected();
QNetworkInformation , initially introduced in Qt 6.1, aims to replace some aspects of the bearer management API. It works by providing a unified API which subscribes to changes to the network as notified by the operating system.
QNetworkInformation::reachability (), introduced in Qt 6.1, replaces the QNetworkAccessManager::networkAccessible() function, while adding more detailed information about the reachability of the network. See its documentation for more details.
在 Qt 6.2 QNetworkInformation 獲得檢測俘虜傳送門的能力。
在 Qt 6.3 QNetworkInformation 獲得 QNetworkInformation::transportMedium () 和 QNetworkInformation::isMetered ().
幾個枚舉器被移除在 QtNetwork . This includes constants for no longer supported protocols and functionality:
and enumerators whose names did not follow proper naming conventions:
QNetworkRequest::FollowRedirectsAttribute 在 Qt 6 被移除，見 處理重定嚮的有關章節 下文。
以下棄用功能在 Qt 6 中被移除：
QList<QSslCipher> ciphers() const; void setCiphers(const QList<QSslCipher> &ciphers); void setCiphers(const QString &ciphers); static void setDefaultCiphers(const QList<QSslCipher> &ciphers); static QList<QSslCipher> defaultCiphers(); static QList<QSslCipher> supportedCiphers(); QList<QSslCipher> ciphers() const; void setCiphers(const QList<QSslCipher> &ciphers); void setCiphers(const QString &ciphers); static void setDefaultCiphers(const QList<QSslCipher> &ciphers); static QList<QSslCipher> defaultCiphers(); static QList<QSslCipher> supportedCiphers(); bool addCaCertificates(const QString &path, QSsl::EncodingFormat format = QSsl::Pem, QRegExp::PatternSyntax syntax = QRegExp::FixedString); void addCaCertificate(const QSslCertificate &certificate); void addCaCertificates(const QList<QSslCertificate> &certificates); void setCaCertificates(const QList<QSslCertificate> &certificates); QList<QSslCertificate> caCertificates() const; static bool addDefaultCaCertificates(const QString &path, QSsl::EncodingFormat format = QSsl::Pem, QRegExp::PatternSyntax syntax = QRegExp::FixedString); static void addDefaultCaCertificate(const QSslCertificate &certificate); static void addDefaultCaCertificates(const QList<QSslCertificate> &certificates); static void setDefaultCaCertificates(const QList<QSslCertificate> &certificates); static QList<QSslCertificate> defaultCaCertificates(); static QList<QSslCertificate> systemCaCertificates();
使用 QSslConfiguration and its member functions to set these parameters, e.g.:
auto sslConfiguration = QSslConfiguration::defaultConfiguration(); sslConfiguration.setCiphers("ECDHE-ECDSA-AES256-SHA384"); // Set other parameters here ... socket.setSslConfiguration(sslConfiguration);
在 Qt 6，默認重定嚮策略已從手動改為 QNetworkRequest::NoLessSafeRedirectPolicy . If your application relies on manual redirect handling (it connects its slot to the QNetworkReply::redirected signal), you have to explicitly set this policy when creating a request:
request.setAttribute(QNetworkRequest::RedirectPolicyAttribute, QNetworkRequest::ManualRedirectPolicy);
在 Qt 6 中 QNetworkAccessManager 默認啓用 HTTP/2 協議。從屬方案 (https 或 http)， QNetworkAccessManager will use the Application Layer Protocol Negotiation TLS extension or "protocol upgrade" HTTP header to negotiate HTTP/2. If HTTP/2 cannot be negotiated, the access manager will fall back to using HTTP/1.1. If your application can only use HTTP/1.1, you have to disable HTTP/2 manually on a new request:
request.setAttribute(QNetworkRequest::Http2AllowedAttribute, false);
從 Qt 6.2 開始 QNetworkAccessManager will guard against compressed files that decompress to files which are much larger than their compressed form by erroring out the reply if the decompression ratio exceeds a certain threshold. This check is only applied to files larger than a certain size, which can be customized (or disabled by passing -1) by calling QNetworkRequest::setDecompressedSafetyCheckThreshold ().
