For my http requests, I've been utilizing a CORS-Proxy which works well for me. However, I recently stumbled upon an API for sending emails which requires http basic authentication for https requests. I'm uncertain of how to go about implementing this.
The proxy server I am currently using can be found here: https://github.com/gr2m/CORS-Proxy
In addition, I came across another option called https://github.com/Rob--W/cors-anywhere which supports https but lacks support for basic authentication.