PHP 7.3 exception/network connection lost

[dlxko]

Version: https://pastebin.com/DJuHPbaH
https://forum.nette.org/cs/31606-php-7-3-ajax-formulare-problem

Bug Description

After updating the server to PHP 7.3 i have a problem with the forms which use the
ajax submit requests. When I try to call the save callback on Safari, it returns
connection lost (dump here https://pastebin.com/ZRvMMfZJ). When I try to
send the request again it fails with the Exception here https://uloz.to/!IlAKlALY6G9C/chyba-pdf.
On Chrome it directly goes into the Exception.

Steps To Reproduce

Create the Ajax form
Use PHP 7.3
Send it with the params shown in the exception (request)

Expected Behavior

Save the form without any problems

Possible Solution

Find the solution for the exception firstly ? :)

[David Grudl]

OPcache problem https://forum.nette.org/cs/31606-php-7-3-ajax-formulare-problem#p201526