https://netty.io/4.1/api/io/netty/handler/codec/http/HttpClientUpgradeHandler.SourceCodec.html
HttpClientUpgradeHandler.SourceCodec (Netty API Reference (4.1.133.Final))
declaration: package: io.netty.handler.codec.http, class: HttpClientUpgradeHandler, interface: SourceCodec
api referencenettyfinal