[wp-trac] [WordPress Trac] #36638: Detect broken URLs in the editor

[WordPress Trac]

#36638: Detect broken URLs in the editor
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 Reporter:  iseulde                         |       Owner:  azaozz
     Type:  task (blessed)                  |      Status:  assigned
 Priority:  normal                          |   Milestone:  4.6
Component:  Editor                          |     Version:
 Severity:  normal                          |  Resolution:
 Keywords:  needs-unit-tests needs-testing  |     Focuses:  ui
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Comment (by afercia):

 More related to `wp_remote_get()` but worth reminding some ISPs redirect
 to a "courtesy page" (for marketing purposes!) when you request a not
 existent URL. I usually change my DNS but I forgot to do that on the
 machine I was using for testing. Thus, with my ISP default DNS, any not
 existent URL I was intentionally typing was "good" and no error appeared.
 Specifically, I was getting a 302 followed by a 200:

 [[Image(https://cldup.com/ozZUcq4R8i.png)]]

 I'm afraid there's no much we can do here other than blaming bad ISPs
 practices :(

 About the JS part, I'm not sure I understand the checks for `visible()`
 for example in `setLinkError()` where `toolbar.visible()` is always false
 for me.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36638#comment:35>
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