If you set the environment variable HTTPS_PROXY for a proxy server, make certain that the value of the variable starts with "https://" and not "http://."

If using the "https://" protocol for HTTPS_PROXY is not possible, there is an alternative. Set the environment variable no_grpc_proxy with internal URLs to ignore the proxy settings for internal communications. Depending on the required system configuration, this environment variable may contain one or more of the following as a comma-separated list:

The setting "no_grpc_proxy=localhost" is generally sufficient, however, "no_grpc_proxy=127.0.0.1,localhost,localhost.localdomain" is also valid.