Supporting App Transport Security is important. But not all the keys are obvious.

Here's where nscurl comes in. Mentioned in the same page above, running nscurl --ats-diagnostics --verbose <URL> shows you diagnostics output which will help you determine which keys and values you need to specify for ATS. e.g.:

Default ATS Secure Connection
---
ATS Default Connection
ATS Dictionary:
{
}
Result : PASS
---

================================================================================

Allowing Arbitrary Loads

---
Allow All Loads
ATS Dictionary:
{
    NSAllowsArbitraryLoads = true;
}
Result : PASS
---

================================================================================

Configuring TLS exceptions for httpbin.org

---
TLSv1.2
ATS Dictionary:
{
    NSExceptionDomains =     {
        "httpbin.org" =         {
            NSExceptionMinimumTLSVersion = "TLSv1.2";
        };
    };
}
Result : PASS

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