google.golang.org/grpc@v1.62.1/Documentation/proxy.md (about)

     1  # Proxy
     2  
     3  HTTP CONNECT proxies are supported by default in gRPC. The proxy address can be
     4  specified by the environment variables `HTTPS_PROXY` and `NO_PROXY`.  (Note that
     5  these environment variables are case insensitive.)
     6  
     7  ## Custom proxy
     8  
     9  Currently, proxy support is implemented in the default dialer. It does one more
    10  handshake (a CONNECT handshake in the case of HTTP CONNECT proxy) on the
    11  connection before giving it to gRPC.
    12  
    13  If the default proxy doesn't work for you, replace the default dialer with your
    14  custom proxy dialer. This can be done using
    15  [`WithDialer`](https://godoc.org/google.golang.org/grpc#WithDialer).