Client With Proxy

Can you write a client code that will use an external proxy to access blocked and sites and still be able to decrypt traffic?
You can use the standard Basic header as authentication, but in my case the authentication is custom and just uses the `x-token: auth_token` header.
In the end we will have:
```rust
let proxy_client = create_proxy_client(
opt.proxy_addr,
opt.auth_token,
).await?

let default_client = DefaultClient::new()?
```
so that you can send the desired hosts through an external proxy