I\'m receiving a message \"Failed to load resource: The network connection was lost.\" in my application, which uses ajax requests to get content from
Had this trouble too with a form that ajax-posted and when that completed did a window.location.reload(true). Safari 13.0.3 would work the first time after a manual page refresh (seemed consistent) then would get "Failed to load resource: The network connection was lost." roughly 2 out of 3 clicks.
Changed the client to:
use ajax-get instead of post (with a unique query param value each time)
on completion set a timer so that window.location.reload(true) was not done inside the ajax completion handler
User reports that worked, not sure which one of those changes or both.
Hope this helps someone...
One of the reasons why it might happen is the way Safari handles some SSL certificates (mainly, LetsEncrypt). The solution is to put the line:
ssl_session_cache shared:SSL:10m;
to your nginx config.
Source: https://community.letsencrypt.org/t/apple-safari-browsers-fail-to-connect/3731/3