System.Net.AuthenticationState.AttemptAuthenticate C# (CSharp) Method

        internal bool AttemptAuthenticate(HttpWebRequest httpWebRequest, ICredentials authInfo) {
            //
            // Check for previous authentication attempts or the presence of credentials
            //
            GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() httpWebRequest#" + ValidationHelper.HashString(httpWebRequest) + " AuthorizationHeader:" + AuthorizationHeader.ToString());

            if (Authorization!=null && Authorization.Complete) {
                GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() Authorization!=null Authorization.Complete:" + Authorization.Complete.ToString());
                if (IsProxyAuth) {
                    GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() ProxyAuth cleaning up auth status");
                    ClearAuthReq(httpWebRequest);
                }
                return false;
            }

            if (authInfo==null) {
                GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() authInfo==null Authorization#" + ValidationHelper.HashString(Authorization));
                return false;
            }

            string challenge = httpWebRequest.AuthHeader(AuthenticateHeader);

            if (challenge==null) {
                //
                // the server sent no challenge, but this might be the case
                // in which we're succeeding an authorization handshake to
                // a proxy while a handshake with the server is still in progress.
                // if the handshake with the proxy is complete and we actually have
                // a handshake with the server in progress we can send the authorization header for the server as well.
                //
                if (!IsProxyAuth && Authorization!=null && httpWebRequest.ProxyAuthenticationState.Authorization!=null) {
                    httpWebRequest.Headers.Set(AuthorizationHeader, Authorization.Message);
                }
                GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() challenge==null Authorization#" + ValidationHelper.HashString(Authorization));
                return false;
            }

            //
            // if the AuthenticationManager throws on Authenticate,
            // bubble up that Exception to the user
            //
            GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() challenge:" + challenge);

            PrepareState(httpWebRequest);
            try {
                Authorization = AuthenticationManager.Authenticate(challenge, httpWebRequest, authInfo);
            }
            catch (Exception exception) {
                Authorization = null;
                GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() PreAuthenticate() returned exception:" + exception.Message);
                ClearSession(httpWebRequest);
                throw;
            }
            catch {
                Authorization = null;
                GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() PreAuthenticate() returned exception: Non-CLS Compliant Exception");
                ClearSession(httpWebRequest);
                throw;
            }


            if (Authorization==null) {
                GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() Authorization==null");
                return false;
            }
            if (Authorization.Message==null) {
                GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() Authorization.Message==null");
                Authorization = null;
                return false;
            }

            UniqueGroupId = Authorization.ConnectionGroupId;
            GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() AuthorizationHeader:" + AuthorizationHeader + " blob: " + Authorization.Message.Length + "bytes Complete:" + Authorization.Complete.ToString());

            try {
                //
                // a "bad" module could try sending bad characters in the HTTP headers.
                // catch the exception from WebHeaderCollection.CheckBadChars()
                // fail the auth process
                // and return the exception to the user as InnerException
                //
                httpWebRequest.Headers.Set(AuthorizationHeader, Authorization.Message);
            }
            catch {
                Authorization = null;
                ClearSession(httpWebRequest);
                throw;
            }

            return true;
        }