Finch.build

You're seeing just the function build, go back to Finch module for more information.
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build(method, url, headers \\ [], body \\ nil, opts \\ [])

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Builds an HTTP request to be sent with request/3 or stream/4.

It is possible to send the request body in a streaming fashion. In order to do so, the body parameter needs to take form of a tuple {:stream, body_stream}, where body_stream is a Stream.