Compiling answers given by @adurdin and @User
Add followings to your info.plist & change localhost.com with your corresponding domain name, you can add multiple domains as well:
NSAppTransportSecurity
NSAllowsArbitraryLoads
NSExceptionDomains
localhost.com
NSIncludesSubdomains
NSExceptionAllowsInsecureHTTPLoads
NSExceptionRequiresForwardSecrecy
NSExceptionMinimumTLSVersion
TLSv1.2
NSThirdPartyExceptionAllowsInsecureHTTPLoads
NSThirdPartyExceptionRequiresForwardSecrecy
NSThirdPartyExceptionMinimumTLSVersion
TLSv1.2
NSRequiresCertificateTransparency
You info.plist must looks like this:
