Router

Run mix phx.routes to see route list

mix phx.routes

lib/eServer_web/router.ex

defmodule EServerWeb.Router do
  use EServerWeb, :router #make route fts available here

  pipeline :browser do #middleware
    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_flash
    plug :protect_from_forgery
    plug :put_secure_browser_headers
  end

  pipeline :api do
    plug :accepts, ["json"]
  end

  scope "/", EServerWeb do
    pipe_through :browser

        #first clause to match
    get "/", PageController, :index
    get "/hello", HelloController, :index
      get "/hello/:messenger", HelloController, :show
      resources "/users", UserController
  end

    forward "/jobs", BackgroundJob.Plug
  # Other scopes may use custom stacks.
  # scope "/api", EServerWeb do
  #   pipe_through :api
  # end
end

Adding Routes

In the scope, its http-verb, Controller, and function in that controller

get "/hello", HelloController, :index

Then add a controller and view

resources "/users", UserController

Expands out to

ACTION	Route	Function
GET	/users	HelloWeb.UserController :index
GET	/users/:id/edit	HelloWeb.UserController :edit
GET	/users/new	HelloWeb.UserController :new
GET	/users/:id	HelloWeb.UserController :show
POST	/users	HelloWeb.UserController :create
PATCH	/users/:id	HelloWeb.UserController :update
PUT	/users/:id	HelloWeb.UserController :update
DELETE	/users/:id	HelloWeb.UserController :delete

resources "/posts", PostController, only: [:index, :show]
resources "/actions", ActionController, except: [:new, :edit, :show]

More

get is actually a Phoenix macro that is one clause of a match for HTTP get request

Error handling in the default error view, default is returning name from status code