java.lang.Object
- io.netty.channel.ChannelHandlerAdapter
- - io.netty.channel.ChannelInboundHandlerAdapter
  - - io.netty.channel.ChannelDuplexHandler
    - - io.netty.channel.CombinedChannelDuplexHandler<HttpResponseDecoder,HttpRequestEncoder>
      - io.netty.handler.codec.http.HttpClientCodec

All Implemented Interfaces:

ChannelHandler, ChannelInboundHandler, ChannelOutboundHandler, HttpClientUpgradeHandler.SourceCodec
```
public final class HttpClientCodec
extends CombinedChannelDuplexHandler<HttpResponseDecoder,HttpRequestEncoder>
implements HttpClientUpgradeHandler.SourceCodec
```
A combination of HttpRequestEncoder and HttpResponseDecoder which enables easier client side HTTP implementation. HttpClientCodec provides additional state management for HEAD and CONNECT requests, which HttpResponseDecoder lacks. Please refer to HttpResponseDecoder to learn what additional state management needs to be done for HEAD and CONNECT and why HttpResponseDecoder can not handle it by itself.
If the Channel is closed and there are missing responses, a PrematureChannelClosureException is thrown.
Header Validation
It is recommended to always enable header validation.
Without header validation, your system can become vulnerable to CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') .
This recommendation stands even when both peers in the HTTP exchange are trusted, as it helps with defence-in-depth.

See Also:

HttpServerCodec

Nested Class Summary
- Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler
  ChannelHandler.Sharable

Field Summary

Fields
Modifier and Type Field Description

static boolean DEFAULT_FAIL_ON_MISSING_RESPONSE

static boolean DEFAULT_PARSE_HTTP_AFTER_CONNECT_REQUEST

Constructor Summary

Constructors
Constructor	Description
`HttpClientCodec()`	Creates a new instance with the default decoder options (`maxInitialLineLength (4096)`, `maxHeaderSize (8192)`, and `maxChunkSize (8192)`).
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize)`	Creates a new instance with the specified decoder options.
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse)`	Creates a new instance with the specified decoder options.
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse, boolean validateHeaders)`	Deprecated. Prefer the `HttpClientCodec(int, int, int, boolean)` constructor, to always enable header validation.
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse, boolean validateHeaders, boolean parseHttpAfterConnectRequest)`	Deprecated. Prefer the `HttpClientCodec(HttpDecoderConfig, boolean, boolean)` constructor, to always enable header validation.
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse, boolean validateHeaders, int initialBufferSize)`	Deprecated. Prefer the `HttpClientCodec(HttpDecoderConfig, boolean, boolean)` constructor, to always enable header validation.
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse, boolean validateHeaders, int initialBufferSize, boolean parseHttpAfterConnectRequest)`	Deprecated. Prefer the `HttpClientCodec(HttpDecoderConfig, boolean, boolean)` constructor, to always enable header validation.
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse, boolean validateHeaders, int initialBufferSize, boolean parseHttpAfterConnectRequest, boolean allowDuplicateContentLengths)`	Deprecated. Prefer the `HttpClientCodec(HttpDecoderConfig, boolean, boolean)` constructor, to always enable header validation.
`HttpClientCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse, boolean validateHeaders, int initialBufferSize, boolean parseHttpAfterConnectRequest, boolean allowDuplicateContentLengths, boolean allowPartialChunks)`	Deprecated. Prefer the `HttpClientCodec(HttpDecoderConfig, boolean, boolean)` constructor, to always enable header validation.
`HttpClientCodec(HttpDecoderConfig config, boolean parseHttpAfterConnectRequest, boolean failOnMissingResponse)`	Creates a new instance with the specified decoder options.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`isSingleDecode()`
`void`	`prepareUpgradeFrom(ChannelHandlerContext ctx)`	Prepares to upgrade to another protocol from HTTP.
`void`	`setSingleDecode(boolean singleDecode)`
`void`	`upgradeFrom(ChannelHandlerContext ctx)`	Upgrades to another protocol from HTTP.

Methods inherited from class io.netty.channel.CombinedChannelDuplexHandler
bind, channelActive, channelInactive, channelRead, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, close, connect, deregister, disconnect, exceptionCaught, flush, handlerAdded, handlerRemoved, inboundHandler, init, outboundHandler, read, removeInboundHandler, removeOutboundHandler, userEventTriggered, write

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

Field Detail
- DEFAULT_FAIL_ON_MISSING_RESPONSE
```
public static final boolean DEFAULT_FAIL_ON_MISSING_RESPONSE
```
  See Also:
  
  Constant Field Values
- DEFAULT_PARSE_HTTP_AFTER_CONNECT_REQUEST
```
public static final boolean DEFAULT_PARSE_HTTP_AFTER_CONNECT_REQUEST
```
  See Also:
  
  Constant Field Values