protected override void Decode(IChannelHandlerContext context, IHttpObject message, List <object> output)
{
try
{
if (message is IHttpResponse response && response.Status.Code == StatusCodes.Status100Continue)
{
if (!(response is ILastHttpContent))
{
_continueResponse = true;
}
// 100-continue response must be passed through.
output.Add(ReferenceCountUtil.Retain(message));
return;
}
if (_continueResponse)
{
if (message is ILastHttpContent)
{
_continueResponse = false;
}
// 100-continue response must be passed through.
output.Add(ReferenceCountUtil.Retain(message));
return;
}
var httpContent = message as IHttpContent;
if (message is IHttpMessage httpMessage)
{
Cleanup();
HttpHeaders headers = httpMessage.Headers;
// Determine the content encoding.
if (headers.TryGet(HttpHeaderNames.ContentEncoding, out ICharSequence contentEncoding))
{
contentEncoding = AsciiString.Trim(contentEncoding);
}
else
{
if (headers.TryGet(HttpHeaderNames.TransferEncoding, out var transferEncoding))
{
int idx = transferEncoding.IndexOf(HttpConstants.CommaChar);
if (SharedConstants.TooBigOrNegative >= (uint)idx) // != -1
{
contentEncoding = AsciiString.Trim(transferEncoding.SubSequence(0, idx));
}
else
{
contentEncoding = AsciiString.Trim(transferEncoding);
}
}
else
{
contentEncoding = Identity;
}
//contentEncoding = Identity;
}
_decoder = NewContentDecoder(contentEncoding);
if (_decoder is null)
{
if (httpContent is object)
{
_ = httpContent.Retain();
}
output.Add(httpMessage);
return;
}
// Remove content-length header:
// the correct value can be set only after all chunks are processed/decoded.
// If buffering is not an issue, add HttpObjectAggregator down the chain, it will set the header.
// Otherwise, rely on LastHttpContent message.
if (headers.Contains(HttpHeaderNames.ContentLength))
{
_ = headers.Remove(HttpHeaderNames.ContentLength);
_ = headers.Set(HttpHeaderNames.TransferEncoding, HttpHeaderValues.Chunked);
}
// Either it is already chunked or EOF terminated.
// See https://github.com/netty/netty/issues/5892
// set new content encoding,
ICharSequence targetContentEncoding = GetTargetContentEncoding(contentEncoding);
if (HttpHeaderValues.Identity.ContentEquals(targetContentEncoding))
{
// Do NOT set the 'Content-Encoding' header if the target encoding is 'identity'
// as per: http://tools.ietf.org/html/rfc2616#section-14.11
_ = headers.Remove(HttpHeaderNames.ContentEncoding);
}
else
{
_ = headers.Set(HttpHeaderNames.ContentEncoding, targetContentEncoding);
}
if (httpContent is object)
{
// If message is a full request or response object (headers + data), don't copy data part into out.
// Output headers only; data part will be decoded below.
// Note: "copy" object must not be an instance of LastHttpContent class,
// as this would (erroneously) indicate the end of the HttpMessage to other handlers.
IHttpMessage copy = null;
switch (httpMessage)
{
case IHttpRequest req:
// HttpRequest or FullHttpRequest
copy = new DefaultHttpRequest(req.ProtocolVersion, req.Method, req.Uri);
break;
case IHttpResponse res:
// HttpResponse or FullHttpResponse
copy = new DefaultHttpResponse(res.ProtocolVersion, res.Status);
break;
default:
ThrowHelper.ThrowCodecException_InvalidHttpMsg(httpMessage);
break;
}
_ = copy.Headers.Set(httpMessage.Headers);
copy.Result = httpMessage.Result;
output.Add(copy);
}
else
{
output.Add(httpMessage);
}
}
if (httpContent is object)
{
if (_decoder is null)
{
output.Add(httpContent.Retain());
}
else
{
DecodeContent(httpContent, output);
}
}
}
finally
{
_needRead = 0u >= (uint)output.Count;
}
}