Okay found the issue, I didn't notice that I set status to 419 on Try Catch catch block so thought it was about Symfony or client side. After doing some debugging I get "An error has occurred resolving the options of the form "App\Form\SiparisType": The required option "firma" is missing." error which is caused by
SiparisConroller.php
$form = $this->createForm(SiparisType::class, $siparis);
This line in save_siparis() function. In SiparisType I have set 'firma' field as required SiparisType.php
$resolver->setRequired(['firma']);
Therefore I got an error in Try Catch block.
Thanks to @jean-max for his advice to check Try Catch.
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
Symfony compares favorably with other PHP frameworks in terms of reliability and maturity. This framework appeared a long time ago, in 2005, that is, it has existed much longer than most of the other tools we are considering. It is popular for its web standards compliance and PHP design patterns.
https://symfony.com/
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