jquery ajax post request to remote server not ending - pending

jquery ajax post request with large text ( 14,4,Kb ) pending on net server.

If the data is less than 1240 bytes ( with id and identifikator 1253 bytes) then works.

Not work only on my computer. Even from Virtual Mashine ( Win10 ). On other computer works fine. On local server works fine.

Linux Mint 17.3
nginx/1.4.6 (Ubuntu)
php 5.5.9-1ubuntu4.20
laravel 5.1 
jquery 2.2.3

You have any idea why?

via Chebli Mohamed