I wrote an HTTP server and a client.A client sends 100 requests in a sequentially order. When I run the HTTP server with one client it works ok. But, when I run the HTTP server with two clients (each sends requests to a different port) the server get all the requests (200 requests) but the body of some of the requests is empty. I run the 3 processes on the same computer with Windows XP. Does anyone know why the body is empty? Code: Client code is the following: int main (int argc, char *argv[]) { BOOL bResults = FALSE; HINTERNET hSession = NULL; HINTERNET hConnect = NULL; HINTERNET hRequest = NULL; DWORD dwSize = 0; DWORD dwDownloaded = 0; LPSTR pszOutBuffer; for (int i = 1; i<=100; i++) { hSession = NULL; hConnect = NULL; hRequest = NULL; // Use WinHttpOpen to obtain a session handle. hSession = WinHttpOpen( L"A WinHTTP Example Program/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0); // Specify an HTTP server. if (hSession) hConnect = WinHttpConnect( hSession, L"localhost", 80, 0); // Create an HTTP Request handle. if (hConnect) hRequest = WinHttpOpenRequest( hConnect, L"POST", L"/index.html", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, 0); // Send a Request. if (hRequest) bResults = WinHttpSendRequest( hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, "ABC", 4, 4, 0); // Place additional code here. // Report errors. if (!bResults) printf("Error %d has occurred.\n",GetLastError()); // End the request. if (bResults) bResults = WinHttpReceiveResponse( hRequest, NULL); // Keep checking for data until there is nothing left. if (bResults) do { // Check for available data. dwSize = 0; if (!WinHttpQueryDataAvailable( hRequest, &dwSize)) printf("Error %u in WinHttpQueryDataAvailable.\n",GetLastError()); // Allocate space for the buffer. pszOutBuffer = new char[dwSize+1]; if (!pszOutBuffer) { printf("Out of memory\n"); dwSize=0; } else { // Read the Data. ZeroMemory(pszOutBuffer, dwSize+1); if (!WinHttpReadData( hRequest, (LPVOID)pszOutBuffer, dwSize, &dwDownloaded)) printf("Error %u in WinHttpReadData.\n", GetLastError()); else printf("%s",pszOutBuffer); // Free the memory allocated to the buffer. delete [] pszOutBuffer; } } while (dwSize>0); // Close open handles. if (hRequest) WinHttpCloseHandle(hRequest); if (hConnect) WinHttpCloseHandle(hConnect); if (hSession) WinHttpCloseHandle(hSession); } return 0; }; Part of the server code (taken from msdn): I use the following function as a listner: Code: result = HttpReceiveHttpRequest( hReqQueue, requestId, HTTP_RECEIVE_REQUEST_FLAG_COPY_BODY, pRequest, RequestBufferLength, &bytesRead, NULL ); And for each request do Code: if(pRequest->Flags & HTTP_REQUEST_FLAG_MORE_ENTITY_BODY_EXISTS) { if(GetTempFileName(L".\",L"New",0, szTempName) == 0) { result = GetLastError(); wprintf(L"GetTempFileName failed with %lu \n", result); goto Done; } hTempFile = CreateFile(szTempName, GENERIC_READ | ENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if(hTempFile == INVALID_HANDLE_VALUE) { result = GetLastError(); wprintf(L"Could not create temporary file. Error %lu \n", result); goto Done; } do { // // Read the entity chunk from the request. // BytesRead = 0; result = HttpReceiveRequestEntityBody( hReqQueue, pRequest->RequestId, 0, pEntityBuffer, EntityBufferLength, &BytesRead, NULL ); switch(result) { case NO_ERROR: if(BytesRead != 0) { TotalBytesRead += BytesRead; WriteFile( hTempFile, pEntityBuffer, BytesRead, &TempFileBytesWritten, NULL ); } break; case ERROR_HANDLE_EOF: if(BytesRead != 0) { TotalBytesRead += BytesRead; WriteFile( hTempFile, pEntityBuffer, BytesRead, &TempFileBytesWritten, NULL ); } StringCchPrintfA( szContentLength, sizeof(szContentLength), "%lu", TotalBytesRead ); ADD_KNOWN_HEADER( response, HttpHeaderContentLength, szContentLength ); result = HttpSendHttpResponse( hReqQueue, // ReqQueueHandle pRequest->RequestId, // Request ID HTTP_SEND_RESPONSE_FLAG_MORE_DATA, &response, // HTTP response NULL, // pReserved1 &bytesSent, // bytes sent (optional) NULL, // pReserved2 0, // Reserved3 NULL, // LPOVERLAPPED NULL // pReserved4 ); if(result != NO_ERROR) { wprintf(L"HttpSendHttpResponse failed with %lu \n", result); goto Done; } // // Send entity body from a file handle. // dataChunk.DataChunkType = HttpDataChunkFromFileHandle; dataChunk.FromFileHandle. ByteRange.StartingOffset.QuadPart = 0; dataChunk.FromFileHandle. ByteRange.Length.QuadPart = HTTP_BYTE_RANGE_TO_EOF; dataChunk.FromFileHandle.FileHandle = hTempFile; result = HttpSendResponseEntityBody( hReqQueue, pRequest->RequestId, 0, // This is the last send. 1, // Entity Chunk Count. &dataChunk, NULL, NULL, 0, NULL, NULL ); if(result != NO_ERROR) { wprintf( L"HttpSendResponseEntityBody failed with %lu \n", result ); } goto Done; break; default: wprintf(L"HttpReceiveRequestEntityBody failed with %lu \n", result); goto Done; } } while(TRUE); } else { // This request does not have any entity body. // result = HttpSendHttpResponse( hReqQueue, // ReqQueueHandle pRequest->RequestId, // Request ID 0, &response, // HTTP response NULL, // pReserved1 &bytesSent, // bytes sent (optional) NULL, // pReserved2 0, // Reserved3 NULL, // LPOVERLAPPED NULL // pReserved4 ); if(result != NO_ERROR) { wprintf(L"HttpSendHttpResponse failed with %lu \n", result); } } Done: if(pEntityBuffer) { FREE_MEM(pEntityBuffer); } if(INVALID_HANDLE_VALUE != hTempFile) { CloseHandle(hTempFile); //DeleteFile(szTempName); } return result; }
