netty-example | Netty web project | Websocket library

I am implementing netty proxy server as follows: A http request comes in,

• if local cache has data, write to channel and flush
• if not, fetch the data from remote server, add it to cache and flush

I am having difficulty extracting the byteBuf from response in samehandler as where I write to client.

In the example below, if you see channelRead method of HexDumpProxyFrontendHandler, you will see how I fetch from cache and write. I have added comments in that method below where I am facing difficulty

This code works end to end. so it can be copied and tested locally.

I can see FullHttpResponse object in HexDumpProxyBackendhandler#channelRead. but inside this method, I have no reference to cache nor the id I want to add inside cache.

There are two ways I think this can be solved, I am not clear on how this can be done though.

1) either get cache reference and id in HexdumpProxyBackendHandler, then it becomes easy. but hexDumpBackendhander is instantiated in channelActive of HexDumpFrontendHandler at which point I have not parsed my incoming request

2) get the response bytebuf extracted in HexdumpFrontendHandler#dchannelRead, in which case it is just cache insertion.

HexDumpProxy.java