java.lang.Object
- io.netty5.channel.ChannelHandlerAdapter
- - io.netty5.handler.codec.ByteToMessageDecoder
  - - io.netty5.handler.codec.http2.CleartextHttp2ServerUpgradeHandler

All Implemented Interfaces:

ChannelHandler
```
@UnstableApi
public final class CleartextHttp2ServerUpgradeHandler
extends ByteToMessageDecoder
```
Performing clear-text upgrade, by h2c HTTP upgrade or Prior Knowledge. This handler config pipeline for h2c upgrade when handler added. And will update pipeline once it detects the connection is starting HTTP/2 by prior knowledge or not.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`CleartextHttp2ServerUpgradeHandler.PriorKnowledgeUpgradeEvent`	User event that is fired to notify about HTTP/2 protocol is started.

Nested classes/interfaces inherited from class io.netty5.handler.codec.ByteToMessageDecoder
ByteToMessageDecoder.Cumulator

Field Summary
- Fields inherited from class io.netty5.handler.codec.ByteToMessageDecoder
  COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors
Constructor	Description
`CleartextHttp2ServerUpgradeHandler(HttpServerCodec httpServerCodec, HttpServerUpgradeHandler<?> httpServerUpgradeHandler, ChannelHandler http2ServerHandler)`	Creates the channel handler provide cleartext HTTP/2 upgrade from HTTP upgrade or prior knowledge

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`decode(ChannelHandlerContext ctx, Buffer in)`	Peek inbound message to determine current connection wants to start HTTP/2 by HTTP upgrade or prior knowledge
`void`	`handlerAdded0(ChannelHandlerContext ctx)`

Methods inherited from class io.netty5.handler.codec.ByteToMessageDecoder
actualReadableBytes, channelInactive, channelRead, channelReadComplete, channelShutdown, decodeLast, discardSomeReadBytes, handlerAdded, handlerRemoved, handlerRemoved0, internalBuffer, isSharable, isSingleDecode, setSingleDecode

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty5.channel.ChannelHandler
bind, channelActive, channelExceptionCaught, channelInboundEvent, channelRegistered, channelUnregistered, channelWritabilityChanged, close, connect, deregister, disconnect, flush, pendingOutboundBytes, read, register, sendOutboundEvent, shutdown, write

- Constructor Detail
  - CleartextHttp2ServerUpgradeHandler
```
public CleartextHttp2ServerUpgradeHandler(HttpServerCodec httpServerCodec,
                                          HttpServerUpgradeHandler<?> httpServerUpgradeHandler,
                                          ChannelHandler http2ServerHandler)
```
    Creates the channel handler provide cleartext HTTP/2 upgrade from HTTP upgrade or prior knowledge
    
    Parameters:
    
    httpServerCodec - the http server codec
    
    httpServerUpgradeHandler - the http server upgrade handler for HTTP/2
    
    http2ServerHandler - the http2 server handler, will be added into pipeline when starting HTTP/2 by prior knowledge
- Method Detail
  - handlerAdded0
```
public void handlerAdded0(ChannelHandlerContext ctx)
                   throws Exception
```
    Overrides:
    
    handlerAdded0 in class ByteToMessageDecoder
    
    Throws:
    
    Exception
  - decode
```
protected void decode(ChannelHandlerContext ctx,
                      Buffer in)
               throws Exception
```
    Peek inbound message to determine current connection wants to start HTTP/2 by HTTP upgrade or prior knowledge
    
    Specified by:
    
    decode in class ByteToMessageDecoder
    
    Parameters:
    
    ctx - the ChannelHandlerContext which this ByteToMessageDecoder belongs to
    
    in - the Buffer from which to read data
    
    Throws:
    
    Exception - is thrown if an error occurs

Class CleartextHttp2ServerUpgradeHandler

Nested Class Summary

Nested classes/interfaces inherited from class io.netty5.handler.codec.ByteToMessageDecoder

Field Summary

Fields inherited from class io.netty5.handler.codec.ByteToMessageDecoder

Constructor Summary

Method Summary

Methods inherited from class io.netty5.handler.codec.ByteToMessageDecoder

Methods inherited from class java.lang.Object

Methods inherited from interface io.netty5.channel.ChannelHandler

Constructor Detail

CleartextHttp2ServerUpgradeHandler

Method Detail

handlerAdded0

decode