UDTTServerProject

You can request the Certificate from a well known CA (Certificate Authority) and then set up the Certificate with the App server. The detailed steps are very different depending on the App server. You should complete it following the appropriate guide:

option 1. [best practice]	Running a local CA for development/testing [V] Cordova samples on iOS devices To comply with Apple App Transport Security (ATS), this is mandatory to run the Cordova Sample on iOS devices. You can following these guides to achieve this. ▪ Creating Certificates for TLS Testing https://developer.apple.com/library/archive/technotes/tn2326/_index.html#//apple_ref/doc/uid/DTS40014136 ▪ Installing a CA’s Root Certificate on Your Test Device https://developer.apple.com/library/archive/qa/qa1948/_index.html#//apple_ref/doc/uid/DTS40017603-CH1-SECINSTALLING
option 2.	Use a SaaS service like ngrok You should following its guide to run it. https://ngrok.com/ Note Cordova Sample on iOS does not work in this way.
option 3.	Use a self signed Certificate Note Cordova Sample on iOS does not work in this way. Note PWA Sample does not work in this way.
option 4. [as is]	Stick to http://localhost The http://localhost may still work in some case but you may encounter problems such as: ▪ Impossible to access the sample from different devices ▪ No way to run the sample in mobile devices ▪ Some API would failed depending on the security policy