Return the default domain, given the settings in use.

This global setting identifies which back end to use, and defaults to api.observability.postman.com.

Accept a server name other than the expected one in the TLS handshake.

Shared client to maximize connection re-use.

Use a proxy, "" is none.

Error type for non-2xx HTTP errors.

TODO: shouldn't this be in akita-cli/api_schema?.

Error handling (to call into the telemetry library without creating a circular dependency.).