Unable to decode response from prometheus endpoint

I am using metricbeat but getting error like:

Error fetching data prometheus.collector: unable to decode response from prometheus endpoint: error making http request Get http://testserver:9104/metrics: net:/http: request cancelled (Client.Timeout exceeded while awaiting headers)

It looks like the above url ends with ":" which is causing the issue.

My config details are below:
module: Prometheus
metric_path: /metrics

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