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Proxy
HTTP CONNECT proxies are supported by default in gRPC. The proxy address can be
specified by the environment variables HTTPS_PROXY and NO_PROXY. (Note that
these environment variables are case insensitive.)
NOTE: Using CONNECT proxies via https is not supported. gRPC performs a plaintext CONNECT handshake to establish a tunnel and does not support the additional encryption required to secure the initial connection to the proxy itself.
When using TLS, the gRPC traffic is encrypted end-to-end between the client and the destination server. Even when using a CONNECT proxy without https, the security is not compromised, as the proxy only sees the destination address and cannot intercept the encrypted gRPC data.
Custom proxy
Currently, proxy support is implemented in the default dialer. It does one more handshake (a CONNECT handshake in the case of HTTP CONNECT proxy) on the connection before giving it to gRPC.
If the default proxy doesn't work for you, replace the default dialer with your
custom proxy dialer. This can be done using
WithContextDialer.