No route matches [POST] "/auth/:provider"

Not using any of the existing client side integration libraries, how would I redirect users to the provider auth page?

I tried setting up a form posting to the above url, but it seems that there's no such route in `rails routes`.

I also tried using get request to `/auth/:provider` which then gets redirected to `/omniauth/:provider?resource_class=User`, however also getting `No route matches [GET] "/omniauth/:provider"` error message

Start by reproducing the reported requests against the Rails route table: POST /auth/:provider, GET /auth/:provider, and /omniauth/:provider. Compare the available routes with the documented behavior for users who are not using a client-side integration library; done means the supported redirect flow is clear and the reported route errors are resolved or explicitly documented.

Written by the indexing model from the issue text.