How to Customize the API's Base URL in SDK Initialization?

[phoben]

Due to my location being in a region where access to OpenAI's API URLs is restricted, I'm unable to directly access OpenAI's services. However, I have the option to use alternative mirror URLs for making API calls. Could you guide me on how to specify a custom BaseDomain during the SDK initialization process? This customization would enable me to utilize the SDK in my restricted access region by directing requests through an accessible mirror URL. Thank you for your assistance.