GcsSignedUrl.SignBlob.HTTP.head

You're seeing just the function head, go back to GcsSignedUrl.SignBlob.HTTP 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.

Returns {:ok, response} if the request is successful, {:error, reason} otherwise.

See request/5 for more detailed information.