Aliaksandr Kazelka

Extract HTTP client logic to HttpClient and JavaHttpClient. Make Http…

1

…Client configurable. # Summary Extracted HTTP client functionality to separate class. Introduced HttpClient interface to make the implementation of HTTP client replaceable. In our case having another implementation is necessary...

### General information * SDK/Library version: All versions * Environment: Sandbox and Production * Language, language version, and OS: Java 17 ### Issue description Currently, Braintree SDK uses `java.net.URL`, `java.net.HttpURLConnection`,...