When I use URLRead

Mathematica will popup a window like:

Actually I have given the parameters Password and Username in HTTPRequest, but they seem invalid. Any programmatic method to fill this form so it won't popup?


1 Answer 1


V11 update

For new functions it is enough to use documented Interactive option:

URLRead["https://httpbin.org/status/401", Interactive -> False]

Broken for URLDownload so here's a workaround:

Authentication dialog for URLDownload / URLSave

Pre V11 era, URLFetch and friends solutions

There is an undocumented option DisplayProxyDialog which prevents that:

  , "StatusCode"
  , "DisplayProxyDialog" -> False

As OP noticed it works for URLRead even though it does not appear in Options[URLRead] in contrary to Options[URLFetch].

When switched off you can handle 401 status code however you like, abort, prompt custom dialog etc.

I have not guessed it, WRI Support suggested it to my friend when he asked:

[...] Just informed by our development group that there is such an option (all-be-it undocumented):

"DisplayProxyDialog" -> False

to omit the authentication dialog. [...]

So I suppose this makes it safe to use.

  • $\begingroup$ Would you mind tell me how did you find it?And actually I prefer to fill out this form than forbid its present. $\endgroup$
    – yode
    Commented Oct 18, 2016 at 20:08
  • $\begingroup$ @yode source added. you can create a loop to ask a user to feed credentials to your dialog and redo the call, or something like that. $\endgroup$
    – Kuba
    Commented Oct 19, 2016 at 3:38
  • $\begingroup$ This method solve the problem eventually. $\endgroup$
    – yode
    Commented Oct 21, 2016 at 5:18

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