Geocoder.Providers.OpenCageData.head-exclamation-mark

You're seeing just the function head-exclamation-mark, go back to Geocoder.Providers.OpenCageData module for more information.
Link to this function

head!(url, headers \\ [], options \\ [])

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Specs

Issues a HEAD request to the given url, raising an exception in case of failure.

If the request does not fail, the response is returned.

See request!/5 for more detailed information.