Expected behavior

When the Pulsar client connection fails, we hope to receive a more detailed and specific error message, such as:

WARN[0009] Failed to connect to broker. error="dial tcp [::1]:6650: connect: connection refused" remote_addr="pulsar://localhost:6650"

Actual behavior

pulsar go client return a a generic and unclear message when connection failed, like this:

connection error

Steps to reproduce

Connecting to an abnormal or non-started Pulsar.

System configuration

Pulsar version: master & latest release