Geek asks and answers

Implement encoding with .NET encoding (or at least pseudo code)

I wrote a raw TCP client for HTTP / HTTPS requests, however I am having problems with alternate coding responses. HTTP / 1.1 is a requirement, so I have to support it.

Raw TCP is a business requirement that I need to save, so I cannot switch to .NET HTTPWebRequest / HTTPWebResponse. However, if there is a way to convert the RAW HTTP request / response to HTTPWebRequest / HTTPWebResponse that will work.

+3
source share
2 answers

The best place to start is the http 1.1 specification , which describes how chunking works. In particular, section 3.6.1.

3.6.1

, , ,
. , , , .

   Chunked-Body   = *chunk
                    last-chunk
                    trailer
                    CRLF

   chunk          = chunk-size [ chunk-extension ] CRLF
                    chunk-data CRLF
   chunk-size     = 1*HEX
   last-chunk     = 1*("0") [ chunk-extension ] CRLF

   chunk-extension= *( ";" chunk-ext-name [ "=" chunk-ext-val ] )
   chunk-ext-name = token
   chunk-ext-val  = token | quoted-string
   chunk-data     = chunk-size(OCTET)
   trailer        = *(entity-header CRLF)

- , . , - , , .

HTTP-
. , (. 14,40).

, , - :

done = false;
uint8 bytes[];
while (!done)
{
  chunksizeString = readuntilCRLF(); // read in the chunksize as a string
  chunksizeString.strip(); // strip off the CRLF
  chunksize = chunksizeString.convertHexString2Int(); // convert the hex string to an integer.
  bytes.append(readXBytes(chunksize)); // read in the x bytes and append them to your buffer.
  readCRLF(); // read the trailing CRLF and throw it away.
  if (chunksize == 0)
     done = true; //

}
// now read the trailer if any
// trailer is optional, so it may be just the empty string
trailer = readuntilCRLF()
trailer = trailer.strip()
if (trailer != "")
   readCRLF(); // read out the last CRLF and we are done.

, ";" . , . , chunksize "0x".

+5

:

 length := 0
   read chunk-size, chunk-extension (if any) and CRLF
   while (chunk-size > 0) {
      read chunk-data and CRLF
      append chunk-data to entity-body
      length := length + chunk-size
      read chunk-size and CRLF
   }
   read entity-header
   while (entity-header not empty) {
      append entity-header to existing header fields
      read entity-header
   }
   Content-Length := length
   Remove "chunked" from Transfer-Encoding
+1

More articles:


All Articles