Sends the specified request to the HTTP server, allowing callers to send extra data beyond what is normally passed to HttpSendRequestEx.

extern public static bool HttpSendRequest(

static extern bool WinHttpSendRequest(

Declare Function WinHttpSendRequest Lib "winhttp.dll" (ByVal hRequest As IntPtr, ByVal pwszHeaders As String, ByVal dwHeadersLength As Integer, ByVal lpOptional As Byte(), ByVal dwOptionalLength As Integer, ByVal dwTotalLength As Integer, ByVal dwContext As IntPtr) As Boolean