protected override Result BeginEncode(IHttpResponse httpResponse, ICharSequence acceptEncoding)
{
if (this.contentSizeThreshold > 0)
{
if (httpResponse is IHttpContent httpContent &&
httpContent.Content.ReadableBytes < this.contentSizeThreshold)
{
return(null);
}
}
if (httpResponse.Headers.Contains(HttpHeaderNames.ContentEncoding))
{
// Content-Encoding was set, either as something specific or as the IDENTITY encoding
// Therefore, we should NOT encode here
return(null);
}
ZlibWrapper?wrapper = this.DetermineWrapper(acceptEncoding);
if (wrapper is null)
{
return(null);
}
ICharSequence targetContentEncoding = null;
switch (wrapper.Value)
{
case ZlibWrapper.Gzip:
targetContentEncoding = GZipString;
break;
case ZlibWrapper.Zlib:
targetContentEncoding = DeflateString;
break;
default:
ThrowHelper.ThrowCodecException_InvalidCompression(wrapper.Value); break;
}
return(new Result(targetContentEncoding,
new EmbeddedChannel(
this.handlerContext.Channel.Id,
this.handlerContext.Channel.Metadata.HasDisconnect,
this.handlerContext.Channel.Configuration,
ZlibCodecFactory.NewZlibEncoder(
wrapper.Value, this.compressionLevel, this.windowBits, this.memLevel))));
}