WinHttpSendRequest failed with error code 87

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The error code 87 (ERROR_INVALID_PARAMETER) typically indicates that one or more parameters passed to the WinHttpSendRequest function are invalid. This error can occur due to various reasons. Here are a few possible solutions to address this issue:

  1. Check your function call: Review the parameters passed to the WinHttpSendRequest function and ensure that they are correct. Pay attention to the order and types of the parameters, ensuring they match the function's signature.

  2. Validate the request handle: Make sure that the request handle (hRequest) used in the WinHttpSendRequest function is a valid handle. It should be obtained from a previous call to WinHttpOpenRequest or WinHttpOpen.

  3. Verify the URL: Double-check the URL you are using for the request. Ensure that it is a valid and properly formatted URL. Be mindful of any special characters or incorrect URL encoding that might cause issues.

  4. Check proxy configuration: If you are using a proxy server, verify that the proxy settings are correctly configured. Ensure that the proxy server address, port, and other related settings are accurate.

  5. Validate request headers and options: If you are setting custom request headers or request options using functions like WinHttpSetOption or WinHttpAddRequestHeaders, make sure they are properly formatted and comply with the HTTP protocol standards.

  6. Check for security software or firewall interference: Some security software or firewall settings can interfere with network communication. Temporarily disabling such software or adjusting the firewall settings might help identify if they are causing the issue.

  7. Ensure proper error handling: Implement proper error handling in your code to capture and display any additional error information that may be available. Use GetLastError or GetLastErrorString functions to retrieve more specific error details.

By following these steps, you should be able to troubleshoot and resolve the WinHttpSendRequest failed with error code 87 issue.