Locks the requested resource so that the IInternetProtocolRoot::Terminate method can be called, and the remaining data can be read.
HRESULT retVal = object.LockRequest(dwOptions);
Reserved. Must be set to 0.
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
For asynchronous pluggable protocols that do not have to lock a request, the method should return S_OK.