iOS 16 Webview Set Cookie Or Response Error

Hello, I am developing a firewall against http attacks at Layer7 layer. And no system (linux/windows/android/bsd/ios version < 16) works flawlessly, except for ios 16 version.

İos 16 device screen record (error): veed . io/view/ab86584b-c054-4b70-8c73-6ae9782fabad)

Old ios version test (no error):

I am using a golang http service in addition to nginx in the opened url. And when I try to access this golang code directly (ios16) I get 503 error from a device. And all this http service does is to set a cookie on the client after getting the useragent and ip information.

Code:

What new feature in iOS 16 prevents my service from running? and how can i fix this. Note: In iOS 16, the situation is the same in all browsers, not just safari, I tried it on chrome. However, there is no problem when I try it on 15 and lower versions, which is a lower version. Thanks for your help in advance.

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