xerions
Derive schemes from endpoint :url
Summary
When handling url schemes (http/https), phoenix swagger currently does only take into account if there is set up a :https server in the endpoint config. Instead, it should first lookup if under the endpoint :url config a custom scheme is defined.
Problem
Currently, phoenix swagger is generating the base url with scheme “https” only if in the phoenix endpoint_config it is set as distinct :https server. (see https://github.com/xerions/phoenix_swagger/blob/master/lib/mix/tasks/swagger.generate.ex#L178) The collect_host_from_endpoint. It does not consider the endpoint :url config, in particular it ignores :scheme (see below).
On the other side, it is a common scenario to run one's application behind a (https) reverse proxy. It is therefore in the general interest, to allow generating https base paths for the client communication – although the phoenix server is running only in https.
The phoenix docs are clear on the issue. It says that :url is for “generating URLs throughout the app”. https://hexdocs.pm/phoenix/Phoenix.Endpoint.html Moreover, the docs explicitly mention the reverse proxy issue:
The :scheme option accepts "http" and "https" values. Default value is infered from top level :http or :https option. It is useful when hosting Phoenix behind a load balancer or reverse proxy and terminating SSL there.
This PR alters the behavior of phoenix swagger to that extent, that first the configuration in :url is taken into account.
