Review way of finding out the url scheme and suffix in external public url generation

[tangrammer]

This provisional working fix https://github.com/akvo/akvo-flow-api/commit/2023bc2531ef259847b51c190b212ae70ed59cbf should be redesign

Current scenario is:

• when we call flow-api using keycloak: scheme is https and suffix is /flow/
• when we call flow-api using auth0: scheme is https and suffix is /flow/
• when we call flow-api using internal call: scheme is http and suffix is ``

I've observed that nginx-proxy uses http instead of http as scheme when it communicates with backend (... 🤔 is this observation correct? is this behavior the expected one?)

IMO we should set up a new nginx proxy for the internal call that requires same suffix so we don't charge with "external" knowledge backend side

[stale[bot]]

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