QHttpServerResponder Class

API for sending replies from an HTTP server. More...

Header: #include <QHttpServerResponder>
CMake: find_package(Qt6 REQUIRED COMPONENTS HttpServer)
target_link_libraries(mytarget PRIVATE Qt6::HttpServer)
qmake: QT += httpserver
Since: Qt 6.4
Status: Technical Preview

Public Types

enum class StatusCode { Continue, SwitchingProtocols, Processing, Ok, Created, …, NetworkConnectTimeoutError }

Public Functions

QHttpServerResponder(QHttpServerResponder &&other)
~QHttpServerResponder()
(since 6.5) void sendResponse(const QHttpServerResponse &response)
void write(QHttpServerResponder::StatusCode status = StatusCode::Ok)
void write(const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)
void write(const QJsonDocument &document, QHttpServerResponder::StatusCode status = StatusCode::Ok)
void write(QIODevice *data, const QByteArray &mimeType, QHttpServerResponder::StatusCode status = StatusCode::Ok)
void write(QIODevice *data, const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)
void write(const QByteArray &data, const QByteArray &mimeType, QHttpServerResponder::StatusCode status = StatusCode::Ok)
void write(const QByteArray &data, const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)
void write(const QJsonDocument &document, const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)
(since 6.8) void writeBeginChunked(const QByteArray &mimeType, QHttpServerResponder::StatusCode status = StatusCode::Ok)
(since 6.8) void writeBeginChunked(const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)
(since 6.8) void writeBeginChunked(const QHttpHeaders &headers, QList<QHttpHeaders::WellKnownHeader> trailers, QHttpServerResponder::StatusCode status = StatusCode::Ok)
(since 6.8) void writeChunk(const QByteArray &data)
(since 6.8) void writeEndChunked(const QByteArray &data)
(since 6.8) void writeEndChunked(const QByteArray &data, const QHttpHeaders &trailers)

Detailed Description

Provides functions for writing back to an HTTP client with overloads for serializing JSON objects. It also has support for writing HTTP headers and status code.

Member Type Documentation

enum class QHttpServerResponder::StatusCode

HTTP status codes

ConstantValue
QHttpServerResponder::StatusCode::Continue100
QHttpServerResponder::StatusCode::SwitchingProtocols101
QHttpServerResponder::StatusCode::Processing102
QHttpServerResponder::StatusCode::Ok200
QHttpServerResponder::StatusCode::Created201
QHttpServerResponder::StatusCode::Accepted202
QHttpServerResponder::StatusCode::NonAuthoritativeInformation203
QHttpServerResponder::StatusCode::NoContent204
QHttpServerResponder::StatusCode::ResetContent205
QHttpServerResponder::StatusCode::PartialContent206
QHttpServerResponder::StatusCode::MultiStatus207
QHttpServerResponder::StatusCode::AlreadyReported208
QHttpServerResponder::StatusCode::IMUsed226
QHttpServerResponder::StatusCode::MultipleChoices300
QHttpServerResponder::StatusCode::MovedPermanently301
QHttpServerResponder::StatusCode::Found302
QHttpServerResponder::StatusCode::SeeOther303
QHttpServerResponder::StatusCode::NotModified304
QHttpServerResponder::StatusCode::UseProxy305
QHttpServerResponder::StatusCode::TemporaryRedirect307
QHttpServerResponder::StatusCode::PermanentRedirect308
QHttpServerResponder::StatusCode::BadRequest400
QHttpServerResponder::StatusCode::Unauthorized401
QHttpServerResponder::StatusCode::PaymentRequired402
QHttpServerResponder::StatusCode::Forbidden403
QHttpServerResponder::StatusCode::NotFound404
QHttpServerResponder::StatusCode::MethodNotAllowed405
QHttpServerResponder::StatusCode::NotAcceptable406
QHttpServerResponder::StatusCode::ProxyAuthenticationRequired407
QHttpServerResponder::StatusCode::RequestTimeout408
QHttpServerResponder::StatusCode::Conflict409
QHttpServerResponder::StatusCode::Gone410
QHttpServerResponder::StatusCode::LengthRequired411
QHttpServerResponder::StatusCode::PreconditionFailed412
QHttpServerResponder::StatusCode::PayloadTooLarge413
QHttpServerResponder::StatusCode::UriTooLong414
QHttpServerResponder::StatusCode::UnsupportedMediaType415
QHttpServerResponder::StatusCode::RequestRangeNotSatisfiable416
QHttpServerResponder::StatusCode::ExpectationFailed417
QHttpServerResponder::StatusCode::ImATeapot418
QHttpServerResponder::StatusCode::MisdirectedRequest421
QHttpServerResponder::StatusCode::UnprocessableEntity422
QHttpServerResponder::StatusCode::Locked423
QHttpServerResponder::StatusCode::FailedDependency424
QHttpServerResponder::StatusCode::UpgradeRequired426
QHttpServerResponder::StatusCode::PreconditionRequired428
QHttpServerResponder::StatusCode::TooManyRequests429
QHttpServerResponder::StatusCode::RequestHeaderFieldsTooLarge431
QHttpServerResponder::StatusCode::UnavailableForLegalReasons451
QHttpServerResponder::StatusCode::InternalServerError500
QHttpServerResponder::StatusCode::NotImplemented501
QHttpServerResponder::StatusCode::BadGateway502
QHttpServerResponder::StatusCode::ServiceUnavailable503
QHttpServerResponder::StatusCode::GatewayTimeout504
QHttpServerResponder::StatusCode::HttpVersionNotSupported505
QHttpServerResponder::StatusCode::VariantAlsoNegotiates506
QHttpServerResponder::StatusCode::InsufficientStorage507
QHttpServerResponder::StatusCode::LoopDetected508
QHttpServerResponder::StatusCode::NotExtended510
QHttpServerResponder::StatusCode::NetworkAuthenticationRequired511
QHttpServerResponder::StatusCode::NetworkConnectTimeoutError599

Member Function Documentation

QHttpServerResponder::QHttpServerResponder(QHttpServerResponder &&other)

Move-constructs a QHttpServerResponder instance, making it point at the same object that other was pointing to.

[noexcept] QHttpServerResponder::~QHttpServerResponder()

Destroys a QHttpServerResponder.

[since 6.5] void QHttpServerResponder::sendResponse(const QHttpServerResponse &response)

Sends a HTTP response to the client.

This function was introduced in Qt 6.5.

void QHttpServerResponder::write(QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status.

Note: This function sets HTTP Content-Type header as "application/x-empty".

void QHttpServerResponder::write(const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status and HTTP Headers headers.

void QHttpServerResponder::write(const QJsonDocument &document, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status, and JSON document document.

Note: This function sets HTTP Content-Type header as "application/json".

void QHttpServerResponder::write(QIODevice *data, const QByteArray &mimeType, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status and a MIME type mimeType. The I/O device data provides the body of the response. If data is sequential, the body of the message is sent in chunks: otherwise, the function assumes all the content is available and sends it all at once but the read is done in chunks.

Note: This function takes the ownership of data.

void QHttpServerResponder::write(QIODevice *data, const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status and HTTP headers headers. The I/O device data provides the body of the response. If data is sequential, the body of the message is sent in chunks: otherwise, the function assumes all the content is available and sends it all at once but the read is done in chunks.

Note: This function takes the ownership of data.

void QHttpServerResponder::write(const QByteArray &data, const QByteArray &mimeType, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status, a MIME type mimeType and a body data.

void QHttpServerResponder::write(const QByteArray &data, const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status, HTTP Headers headers and a body data.

Note: This function sets HTTP Content-Length header.

void QHttpServerResponder::write(const QJsonDocument &document, const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Answers a request with an HTTP status code status, JSON document document and HTTP headers headers.

Note: This function sets HTTP Content-Type header as "application/json".

[since 6.8] void QHttpServerResponder::writeBeginChunked(const QByteArray &mimeType, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Start sending chunks of data with the mime type mimeType and and the given status code status. This call must be followed up with an arbitrary number of repeated writeChunk calls and and a single call to writeEndChunked.

This function was introduced in Qt 6.8.

See also writeChunk and writeEndChunked.

[since 6.8] void QHttpServerResponder::writeBeginChunked(const QHttpHeaders &headers, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Start sending chunks of data with headers and and the status code status. This call must be followed up with an arbitrary number of repeated writeChunk calls and and a single call to writeEndChunked.

This function was introduced in Qt 6.8.

See also writeChunk and writeEndChunked.

[since 6.8] void QHttpServerResponder::writeBeginChunked(const QHttpHeaders &headers, QList<QHttpHeaders::WellKnownHeader> trailers, QHttpServerResponder::StatusCode status = StatusCode::Ok)

Start sending chunks of data with headers and and the given status code status. This call must be followed up with an arbitrary number of repeated writeChunk calls and and a single call to writeEndChunked with the same trailers given in trailers.

This function was introduced in Qt 6.8.

See also writeChunk and writeEndChunked.

[since 6.8] void QHttpServerResponder::writeChunk(const QByteArray &data)

Write data back to the client. To be called when data is available to write. This can be called multiple times, but before calling this writeBeginChunked must called, and afterwards writeEndChunked must be called.

This function was introduced in Qt 6.8.

See also writeBeginChunked and writeEndChunked.

[since 6.8] void QHttpServerResponder::writeEndChunked(const QByteArray &data)

Write data back to the client. Must be preceded by a call to writeBeginChunked.

This function was introduced in Qt 6.8.

See also writeBeginChunked and writeChunk.

[since 6.8] void QHttpServerResponder::writeEndChunked(const QByteArray &data, const QHttpHeaders &trailers)

Write data back to the client with the trailers announced in writeBeginChunked.

This function was introduced in Qt 6.8.

See also writeBeginChunked and writeChunk.

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