Package io.netty.handler.codec.http

Class HttpServerUpgradeHandler

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.MessageToMessageDecoder<I>

io.netty.handler.codec.MessageAggregator<HttpObject,HttpMessage,HttpContent,FullHttpMessage>

io.netty.handler.codec.http.HttpObjectAggregator

io.netty.handler.codec.http.HttpServerUpgradeHandler

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelInboundHandler

public class HttpServerUpgradeHandler
extends HttpObjectAggregator

A server-side handler that receives HTTP requests and optionally performs a protocol switch if the requested protocol is supported. Once an upgrade is performed, this handler removes itself from the pipeline.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	HttpServerUpgradeHandler.SourceCodec	The source codec that is used in the pipeline initially.
static interface	HttpServerUpgradeHandler.UpgradeCodec	A codec that the source can be upgraded to.
static interface	HttpServerUpgradeHandler.UpgradeCodecFactory	Creates a new HttpServerUpgradeHandler.UpgradeCodec for the requested protocol name.
static final class	HttpServerUpgradeHandler.UpgradeEvent	User event that is fired to notify about the completion of an HTTP upgrade to another protocol.

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

io.netty.channel.ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor	Description
HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec, HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory)	Constructs the upgrader with the supported codecs.
HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec, HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory, int maxContentLength)	Constructs the upgrader with the supported codecs.
HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec, HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory, int maxContentLength, boolean validateHeaders)	Constructs the upgrader with the supported codecs.
HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec, HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory, int maxContentLength, HttpHeadersFactory headersFactory, HttpHeadersFactory trailersFactory)	Constructs the upgrader with the supported codecs.

Method Summary

Modifier and Type	Method	Description
protected void	decode(io.netty.channel.ChannelHandlerContext ctx, HttpObject msg, List<Object> out)
protected boolean	shouldHandleUpgradeRequest(HttpRequest req)	Determines whether the specified upgrade HttpRequest should be handled by this handler or not.

Methods inherited from class io.netty.handler.codec.http.HttpObjectAggregator

aggregate, beginAggregation, closeAfterContinueResponse, finishAggregation, handleOversizedMessage, ignoreContentAfterContinueResponse, isAggregated, isContentLengthInvalid, isContentMessage, isLastContentMessage, isStartMessage, newContinueResponse

Methods inherited from class io.netty.handler.codec.MessageAggregator

acceptInboundMessage, channelInactive, channelReadComplete, ctx, handlerAdded, handlerRemoved, isHandlingOversizedMessage, maxContentLength, maxCumulationBufferComponents, setMaxCumulationBufferComponents

Methods inherited from class io.netty.handler.codec.MessageToMessageDecoder

channelRead

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggered

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, isSharable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HttpServerUpgradeHandler

public HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec,
 HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory)

Constructs the upgrader with the supported codecs.

The handler instantiated by this constructor will reject an upgrade request with non-empty content. It should not be a concern because an upgrade request is most likely a GET request. If you have a client that sends a non-GET upgrade request, please consider using HttpServerUpgradeHandler(SourceCodec, UpgradeCodecFactory, int) to specify the maximum length of the content of an upgrade request.

Parameters:

sourceCodec - the codec that is being used initially

upgradeCodecFactory - the factory that creates a new upgrade codec for one of the requested upgrade protocols

HttpServerUpgradeHandler

public HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec,
 HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory,
 int maxContentLength)

Constructs the upgrader with the supported codecs.

Parameters:

sourceCodec - the codec that is being used initially

upgradeCodecFactory - the factory that creates a new upgrade codec for one of the requested upgrade protocols

maxContentLength - the maximum length of the content of an upgrade request

HttpServerUpgradeHandler

public HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec,
 HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory,
 int maxContentLength,
 boolean validateHeaders)

Constructs the upgrader with the supported codecs.

Parameters:

sourceCodec - the codec that is being used initially

upgradeCodecFactory - the factory that creates a new upgrade codec for one of the requested upgrade protocols

maxContentLength - the maximum length of the content of an upgrade request

validateHeaders - validate the header names and values of the upgrade response.

HttpServerUpgradeHandler

public HttpServerUpgradeHandler(HttpServerUpgradeHandler.SourceCodec sourceCodec,
 HttpServerUpgradeHandler.UpgradeCodecFactory upgradeCodecFactory,
 int maxContentLength,
 HttpHeadersFactory headersFactory,
 HttpHeadersFactory trailersFactory)

Constructs the upgrader with the supported codecs.

Parameters:

sourceCodec - the codec that is being used initially

upgradeCodecFactory - the factory that creates a new upgrade codec for one of the requested upgrade protocols

maxContentLength - the maximum length of the content of an upgrade request

headersFactory - The HttpHeadersFactory to use for headers. The recommended default factory is DefaultHttpHeadersFactory.headersFactory().

trailersFactory - The HttpHeadersFactory to use for trailers. The recommended default factory is DefaultHttpHeadersFactory.trailersFactory().

Method Details

decode

protected void decode(io.netty.channel.ChannelHandlerContext ctx,
 HttpObject msg,
 List<Object> out)
               throws Exception

Overrides:

decode in class io.netty.handler.codec.MessageAggregator<HttpObject,HttpMessage,HttpContent,FullHttpMessage>

Throws:

Exception

shouldHandleUpgradeRequest

protected boolean shouldHandleUpgradeRequest(HttpRequest req)

Determines whether the specified upgrade HttpRequest should be handled by this handler or not. This method will be invoked only when the request contains an Upgrade header. It always returns true by default, which means any request with an Upgrade header will be handled. You can override this method to ignore certain Upgrade headers, for example:

 @Override
 protected boolean isUpgradeRequest(HttpRequest req) {
   // Do not handle WebSocket upgrades.
   return !req.headers().contains(HttpHeaderNames.UPGRADE, "websocket", false);
 }