Show app URLs as relative (#1835)

lib/livebook_web.ex

@@ -80,6 +80,10 @@ defmodule LivebookWeb do
         endpoint: LivebookWeb.Endpoint,
         router: LivebookWeb.Router,
         statics: LivebookWeb.static_paths()
+
+      # We don't know the hostname Livebook runs on, so we don't use
+      # absolute URL helpers
+      import Phoenix.VerifiedRoutes, only: :sigils
     end
   end
 

lib/livebook_web/live/apps_live.ex

@@ -89,8 +89,8 @@ defmodule LivebookWeb.AppsLive do
         <div class="flex-1 grow-[2]">
           <.labeled_text label="URL">
             <%= if @session.app_info.registered do %>
-              <a href={url(~p"/apps/#{@session.app_info.slug}")} target="_blank">
+              <a href={~p"/apps/#{@session.app_info.slug}"} target="_blank">
-                <%= url(~p"/apps/#{@session.app_info.slug}") %>
+                <%= ~p"/apps/#{@session.app_info.slug}" %>
               </a>
             <% else %>
               -

lib/livebook_web/live/session_live/app_info_component.ex

@@ -112,8 +112,8 @@ defmodule LivebookWeb.SessionLive.AppInfoComponent do
               </.labeled_text>
               <.labeled_text label="URL" one_line>
                 <%= if app.registered do %>
-                  <a href={url(~p"/apps/#{app.settings.slug}")} target="_blank">
+                  <a href={~p"/apps/#{app.settings.slug}"} target="_blank">
-                    <%= url(~p"/apps/#{app.settings.slug}") %>
+                    <%= ~p"/apps/#{app.settings.slug}" %>
                   </a>
                 <% else %>
                   -