- 1 year ago
WinHTTP stops downloading after 8 KiB
The behavior you described, where WinHTTP stops downloading after 8 KiB, could be caused by various factors. Here are a few possible reasons and potential solutions:
Buffer Size Limit: By default, WinHTTP uses a buffer size of 8 KiB for downloading. You can try increasing the buffer size to accommodate larger downloads. Use the
WinHttpSetOption
function with theWINHTTP_OPTION_RECEIVE_BUFFER_SIZE
option to set a larger buffer size. For example:c++DWORD bufferSize = 64 * 1024; // 64 KiB
WinHttpSetOption(hRequest, WINHTTP_OPTION_RECEIVE_BUFFER_SIZE, &bufferSize, sizeof(bufferSize));
Content-Length Header: If the server's response does not include a valid
Content-Length
header, WinHTTP may stop downloading after a certain amount of data. Make sure the server is providing the correctContent-Length
header for the file you are trying to download.Network Connectivity Issues: Check for any network connectivity issues that may interrupt the download. Make sure there are no firewalls, proxies, or other network devices interfering with the download process.
Server-Side Limitations: The server you are downloading from may have limitations or restrictions in place that limit the amount of data that can be downloaded in a single request. Check the server's documentation or contact the server administrator for more information.
User-Agent Header: Some servers may have restrictions based on the User-Agent header sent by the client. Try setting a User-Agent header that matches a commonly used browser to see if it makes a difference. Use the
WinHttpSetOption
function with theWINHTTP_OPTION_USER_AGENT
option to set the User-Agent header.
If none of the above solutions work, it may be helpful to provide more specific information about your code and the server you are downloading from so that further troubleshooting can be done.