You're seeing just the function request-exclamation-mark, go back to Sms77.HTTPClient module for more information.
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request!(method, url, body \\ "", headers \\ [], options \\ [])

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Issues an HTTP request with the given method to the given url, raising an exception in case of failure.

request!/5 works exactly like request/5 but it returns just the response in case of a successful request, raising an exception in case the request fails.