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bugs - Authentication dialog for URLDownload / URLSave


Bug introduced in 11.0 and persists through 11.3


The original problem is was fixed in V11.2 but since then it returns File[path/to/file/that/does/not/exits] instead of 401 Failure/HTTPResponse like URLRead does.




CASE:3877019 - confirmed




The second one prompts the dialog:


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

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

but both should return 401 HTTPResponse since




ref/URLDownload:


URLDownload takes the options as URLRead.


ref/URLRead


Interactive - True - whether to allow interactive authentication dialogs



Have I missed something? Is there a workaround?


It probably can be narrowed to URLSave broken for "DisplayProxyDialog" -> False, but this is undocumented so I can't complain.



related:


How to omit the authentification dialog during URLRead?



Inconsistent Authorization Dialog (401) handling



Answer



Before it is fixed one can use this quick workaround based on How to get StatusCode without fetching Body/Content in the background:


DialoglessURLDownload =  URLFetch[
    #, "StatusCode", Method -> "HEAD", "DisplayProxyDialog" -> False
] /. (200 :> URLDownload[##]) &

I've decided I will return the status code for any case that isn't 200, that is arguable but URLDownload itself gives non existing File[...] when it fails so I will not try to mimic wrong behavior. This at least gives you a possibility to react appropriately.


DialoglessURLDownload @ "https://httpbin.org/status/401"



401



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