Bug introduced in V11 and fixed in 11.3

[CASE:3855554] was created

[...] It does appear that the URLRead is not behaving correctly. I have forwarded an incident report to our developers with the information you provided. [...]

This issue is similar to one from a recent report:

Inconsistent HTTPResponse handling

but I decided to post a separate question because I have a fix for this one and not for the linked one.

  • So, let's call where we should not:

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

    enter image description here

    The Interactive -> False option prevents a native authentication dialog from poping up. More in: How to omit the authentification dialog during URLRead?

  • now please Quit[]

  • run the code from above again

    The dialog pops up anyway.

    enter image description here

Have I missed something? Is this a bug?

  • $\begingroup$ It's get more serious in version 11.1.The windows will pup up numerous times.And the option of Interactive or "DisplayProxyDialog" don't take even little effect anymore,which make URLRead almost disabled. $\endgroup$
    – yode
    Mar 17, 2017 at 1:12

1 Answer 1


It seems that some functions are not initialized correctly and options are not passed around as they should. Mentioning URLFetch, which is probably used internally, fixes that


URLFetch; URLRead["https://httpbin.org/status/401", Interactive -> False]
  • $\begingroup$ URLFetch is indeed used internally. It's what URLRead uses to do the proper call (I've spent too much time digging through the PrintDefs recently). Formats an HTTPRequest (this can actually be important) then passes the parameters to URLFetch and returns the HTTPResponse (then URLFetch goes down, on a Mac, to CURLLink which is just a LibraryLink style connection to curl). $\endgroup$
    – b3m2a1
    Mar 17, 2017 at 1:33

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