Apple - How Do I Fully Flush Cached Redirects From Safari?

Based on quanta’s answer:

I wasn’t able to use launchctl unload /System/Library/LaunchAgents/com.apple.nsurlstoraged.plist because I have System Integrity Protection enabled:

$ launchctl unload /System/Library/LaunchAgents/com.apple.nsurlstoraged.plist
/System/Library/LaunchAgents/com.apple.nsurlstoraged.plist: Operation not permitted while System Integrity Protection is engaged

However I was able to work around it by doing the following:

• killall nsurlstoraged (stops your user’s nsurlstoraged process; I actually ran sudo killall nsurlstoraged, but I suspect it isn’t necessary to stop the system’s nsurlstoraged as well, since the cache is in the user Library folder)
• rm -f ~/Library/Cookies/HSTS.plist (deletes the HSTS cache)
• launchctl start /System/Library/LaunchAgents/com.apple.nsurlstoraged.plist (restarts nsurlstoraged)

If you enable Develop menu in Safari preferences, you can clear cache from there (CMD+ALT+E).

Can you confirm that opening the device's control panel in Safari's Private window (or different web browser) works correctly?

Based on @Haravikk's answer: https://apple.stackexchange.com/a/267783/62907

Anyone have any ideas which process is responsible for the ~/Library/Cookies/HSTS.plist file?

fs_usage can help:

❯❯❯❯ sudo fs_usage | grep HSTS
16:11:03    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000238   nsurlstorage
16:11:03    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000009   nsurlstorage
16:11:03  open              /Users/quanta/Library/Cookies/HSTS.plist                                         0.016268   nsurlstorage
16:11:03    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000008   nsurlstorage
16:11:03    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000003   nsurlstorage
16:11:03  access            /Users/quanta/Library/Cookies/HSTS.plist                                         0.000011   dbfseventsd
16:11:04  lstat64           /Users/quanta/Library/Cookies/HSTS.plist                                         0.000008   fseventsd
16:11:08    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000006   nsurlstorage
16:11:08    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000002   nsurlstorage
16:11:08  open              /Users/quanta/Library/Cookies/HSTS.plist                                         0.000144   nsurlstorage
16:11:08    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000002   nsurlstorage
16:11:08    HFS_update      /Users/quanta/Library/Cookies/HSTS.plist                                         0.000003   nsurlstorage
16:11:08  access            /Users/quanta/Library/Cookies/HSTS.plist                                         0.000021   dbfseventsd
16:11:09  lstat64           /Users/quanta/Library/Cookies/HSTS.plist                                         0.000042   fseventsd

So, we can:

launchctl unload /System/Library/LaunchAgents/com.apple.nsurlstoraged.plist

then:

rm -f ~/Library/Cookies/HSTS.plist

and try again.