[REF] Check the pseudo-code before impl. the chunked

[LeaYeh]

4.1.3. Decoding Chunked

   length := 0
   read chunk-size, chunk-ext (if any), and CRLF
   while (chunk-size > 0) {
      read chunk-data and CRLF
      append chunk-data to decoded-body
      length := length + chunk-size
      read chunk-size, chunk-ext (if any), and CRLF
   }
   read trailer field
   while (trailer field is not empty) {
      if (trailer field is allowed to be sent in a trailer) {
          append trailer field to existing header fields
      }
      read trailer-field
   }
   Content-Length := length
   Remove "chunked" from Transfer-Encoding
   Remove Trailer from existing header fields