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Safari giving "kCFErrorDomainCFNetwork error 303" when visiting a site [Resolved]

I am currently having problems visiting

example link

Safari 12 (and 13 b4) on Mojave shows the following error:

kCFErrorDomainCFNetwork error 303

enter image description here

Things I've tried:

  • disable all extensions
  • Develop > Empty Caches
  • trashing Safari.plist
  • booting into Safe Mode
  • recovery mode + Disk Utility First Aid
  • different DNS servers

All have had no effect.

Strangely, the problem does not appear in Safari Technology Preview, Chrome, Opera or Tor.

Question Credit: Matt Sephton
Question Reference
Asked August 13, 2019
Posted Under: Apple
1 Answers

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