title: NTLM authentication in flutter web. options?
body: <p>I have successfully used <a href="https://github.com/mrbbot/ntlm" rel="nofollow noreferrer">https://github.com/mrbbot/ntlm</a> for authentication is iOS... but, after working through some CORS issues, I realize that it doesn't work for flutter web.  I created an issue just in case, but I thought there might be some other ways to approach this. Are there any other options?</p>
  
  <p>This is the error the I got when running ntlm_client.get("url"):</p>
  
  <pre><code>TypeError: Cannot read property 'Symbol(dartx.contains)' of null
      at http.NTLMClient.new._ntlm (http://localhost:50126/packages/ntlm/src/http.dart.lib.js:84:80)
      at _ntlm.next (&lt;anonymous&gt;)
      at http://localhost:50126/dart_sdk.js:37175:33
      at _RootZone.runUnary (http://localhost:50126/dart_sdk.js:37029:58)
      at _FutureListener.thenAwait.handleValue (http://localhost:50126/dart_sdk.js:32116:29)
      at handleValueCallback (http://localhost:50126/dart_sdk.js:32663:49)
      at Function._propagateToListeners (http://localhost:50126/dart_sdk.js:32701:17)
      at _Future.new.[_completeWithValue] (http://localhost:50126/dart_sdk.js:32544:23)
      at async._AsyncCallbackEntry.new.callback (http://localhost:50126/dart_sdk.js:32566:35)
      at Object._microtaskLoop (http://localhost:50126/dart_sdk.js:37290:13)
      at _startMicrotaskLoop (http://localhost:50126/dart_sdk.js:37296:13)
      at http://localhost:50126/dart_sdk.js:32918:9
  </code></pre>