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POWinInet - can't remove Content-Length from headers to manually chunk an upload
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  1. POWinInet - can't remove Content-Length from headers to manually chunk an upload
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    copied!<p>MSDN <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/hh227298%28v=vs.85%29.aspx" rel="nofollow">states</a> that WinInet does not support chunked upload ("Client code must perform the chunking."). To me that meant I could manually chunk the transfer. My intention was to add "Transfer-Encoding: chunked" via <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa384227%28v=vs.85%29.aspx" rel="nofollow">HttpAddRequestHeaders</a>, remove Content-Length via HttpAddRequestHeaders HTTP_ADDREQ_FLAG_REPLACE and then In my InternetWriteFile loop, write the data in chunked encoded blocks. The problem is, I cannot seem to convince WinInet to not send the Content-Length. Even after removal, it ends up sending "Content-Length: 0" to the server (in addition to "Transfer-Encoding: chunked") which is confusing the server.</p> <p>I have also tried setting the HSR_CHUNKED flag in <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa384318%28v=vs.85%29.aspx" rel="nofollow">HttpSendRequestEx</a>.</p> <p>Does anyone have an example of getting WinInet to skip sending the Content-Length?</p> <p>I know WinHTTP claims to support chunked upload, but we have other dependencies on WinInet which is why I am looking to solve the problem there if possible.</p> <p>Here is a code sample of what I have tried:</p> <pre><code>#include &lt;windows.h&gt; #include &lt;wininet.h&gt; #include &lt;tchar.h&gt; #include &lt;stdio.h&gt; bool http_putfile(HINTERNET hConnection, TCHAR* resource); #define HOST _T("www.website.com") #define RESOURCE _T("/path/for/resource") int _tmain(int argc, TCHAR* argv[]) { LPCTSTR lpszHostName = HOST; INTERNET_PORT nServerPort = INTERNET_DEFAULT_HTTP_PORT; DWORD dwService = INTERNET_SERVICE_HTTP; DWORD dwFlags = NULL; DWORD dwContext = 0; HINTERNET hSession = InternetOpen( argv[0], INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, NULL); if(hSession != NULL) { HINTERNET hConnection = InternetConnect( hSession, lpszHostName, nServerPort, NULL, NULL, dwService, dwFlags, dwContext); if(hConnection != NULL) { http_putfile(hConnection, RESOURCE); InternetCloseHandle(hConnection); } else { printf("InternetConnect failed: %d\n", GetLastError()); } InternetCloseHandle(hSession); } else { printf("InternetOpen failed: %d\n", GetLastError()); } return 0; } bool http_putfile(HINTERNET hConnection, TCHAR* resource) { bool result = false; HINTERNET hRequest = HttpOpenRequest( hConnection, _T("PUT"), resource, NULL, NULL, NULL, INTERNET_FLAG_RELOAD | INTERNET_FLAG_EXISTING_CONNECT | INTERNET_FLAG_NO_CACHE_WRITE, 0); if(hRequest != NULL) { HttpAddRequestHeaders( hRequest, _T("Transfer-Encoding: chunked\r\n"), -1L, HTTP_ADDREQ_FLAG_ADD | HTTP_ADDREQ_FLAG_REPLACE); // have tried: // Content-Length // Content-Length: // Content-Length\r\n // Content-Length:\r\n // all with/without HTTP_ADDREQ_FLAG_ADD. Have even tried adding in a Content-Length // and then removing it. All results show "Content-Length: 0" in the header on the wire. if(HttpAddRequestHeaders( hRequest, _T("Content-Length"), -1L, HTTP_ADDREQ_FLAG_ADD | HTTP_ADDREQ_FLAG_REPLACE) == FALSE) { DWORD err = GetLastError(); } // have tried both 0 here for flags as documented on msdn // http://msdn.microsoft.com/en-us/library/windows/desktop/aa384318%28v=vs.85%29.aspx // as well as other combinations of INITIATE/CHUNKED if(HttpSendRequestEx(hRequest, NULL, NULL, HSR_INITIATE | HSR_CHUNKED /* 0 */, NULL)) { DWORD wrote = 0; char* chunks = "5\r\nCHUNK0\r\n"; if(InternetWriteFile( hRequest, chunks, strlen(chunks), &amp;wrote) == FALSE) { printf("InternetWriteFile failed: %d\n", GetLastError()); } HttpEndRequest(hRequest, NULL, 0, NULL); } else { printf("HttpSendRequestEx failed: %d\n", GetLastError); } InternetCloseHandle(hRequest); } else { printf("HttpOpenRequest failed: %d\n", GetLastError()); } return result; } </code></pre>
 

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