Chunked transfer encoding

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hi i develop a Http server,
my Summary of response code is this:

PHTTP_DATA_CHUND p = new HTTP_DATA_CHUND[count];
for (int i = 0; i<count; i++)
{
  p[i].DataChunkType = HttpDataChunkFromMemory;
  p[i].FromMemory.pBuffer = "dfdff"; 
  p[i].FromMemory.BufferLength = 5;
}

HTTP_RESPONSE response;  
ZeroMemory(&response,sizeof(HTTP_RESPONSE));  
PCSTR Reason="OK";  
response.StatusCode=200;  
response.pReason=Reason;  
response.ReasonLength=strlen(Reason);  
ADD_KNOWN_HEADER(response, HttpHeaderContentType, "text/html");
ADD_KNOWN_HEADER(response, HttpHeaderConnection, "keep-alive");
ADD_KNOWN_HEADER(response, HttpHeaderTransferEncoding, "chunked");
ADD_KNOWN_HEADER(response, HttpHeaderContentLength, chLen);

response.EntityChunkCoun = count;
response.pEntityChunks=p;
ULONG BytesSent;
ULONG result = HttpSendHttpResponse(ReqQueueHandle, HttpRequest->RequestId, 
                                            0, &response, NULL,&BytesSent, NULL, 
                                            0,NULL,NULL, NULL);

but the result is 87 !!!
now if i remove this line of code:

ADD_KNOWN_HEADER(response, HttpHeaderTransferEncoding, "chunked");

the result is 0 and my response is sent to client.
How i to make Chunked transfer encoding?

Posted 14-Dec-13 19:23pm

Zon-cpp

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Jochen Arndt 16-Dec-13 3:46am

When using chunked transfers, the Content-Length header is not used. Have you tried sending the response without adding the Content-Length header?

What is the value of your count variable? It must be <= 100.

Zon-cpp 16-Dec-13 4:48am

thank you

Jochen Arndt 17-Dec-13 3:23am

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Jochen Arndt · Accepted Answer · 2013-12-15T23:53:00

My suggestion to remove the Content-Length header seems to solve the problem (see my above comment).

With chunked transfers, the Content-Length header is not used. It seems that the HttpSendHttpResponse function checks the headers and returns with an invalid parameter error when the transfer encoding is chunked and the content length is also present.

This behaviour complies with RFC 2616[^], section 4.4:

Quote:
If a Content-Length header field (section 14.13) is present, its decimal value in OCTETs represents both the entity-length and the transfer-length. The Content-Length header field MUST NOT be sent if these two lengths are different (i.e., if a Transfer-Encoding header field is present).

[UPDATE to answer the question why the client gets normal text rather the chunked data]:

Chunked is a transfer method. The additional information is used only for transferring data and does not belong to the original data. When a client calls some API function to get received HTTP data, this API function will decode chunked data, add a Content-Length header with the size of the decoded data and provides the decoded original data.

Zon-cpp · Accepted Answer · 2013-12-20T20:12:00

i changed my code : this is ok to send response

response.EntityChunkCount = 0;
response.pEntityChunks=0;
ULONG BytesSent;
ULONG result = HttpSendHttpResponse(ReqQueueHandle, HttpRequest->RequestId,
                                            0, &response, NULL,&BytesSent, NULL,
                                            0,NULL,NULL, NULL);
for (/*buffers */)
{
PHTTP_DATA_CHUND chunk;
chunk.DataChunkType = HttpDataChunkFromMemory;
chunk.FromMemory.pBuffer = buffer[i]; //--- "bufferLen\r\n .... \r\n"
chunk.FromMemory.BufferLength = len[i];
HttpSendResponseEntityBody(ReqQueueHandle, HttpRequest->requestId, 
                                 HTT_SEND_RESPONSE_FLAG_MORE_DATA, 1, &chunk, 0
                                 NULL, 0, NULL, NULL);
}

PHTTP_DATA_CHUND chunkEnd;
chunkEnd.DataChunkType = HttpDataChunkFromMemory;
chunkEnd.FromMemory.pBuffer = "\r\n0\r\n";
chunkEnd.FromMemory.BufferLength = 5;
HttpSendResponseEntityBody(ReqQueueHandle, HttpRequest->requestId,
                                 HTT_SEND_RESPONSE_FLAG_DISCONNECT, 1, &chunkEnd, 0
                                 NULL, 0, NULL, NULL);

Chunked transfer encoding

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