Mojito.Headers.auth_header

You're seeing just the function auth_header, go back to Mojito.Headers module for more information.
Link to this function

auth_header(username, password)

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Specs

auth_header(String.t(), String.t()) :: Mojito.header()

Returns an HTTP Basic Auth header from the given username and password.

Example:

iex> Mojito.Headers.auth_header("hello", "world")
{"authorization", "Basic aGVsbG86d29ybGQ="}