Change Sign Out route from a DELETE to a GET

Closes #39708

app/views/layouts/header/_default.html.haml

@@ -61,7 +61,7 @@
                       = link_to "Help", help_path
                   %li.divider
                   %li
-                    = link_to "Sign out", destroy_user_session_path, method: :delete, class: "sign-out-link"
+                    = link_to "Sign out", destroy_user_session_path, class: "sign-out-link"
             - if session[:impersonator_id]
               %li.impersonation
                 = link_to admin_impersonation_path, class: 'impersonation-btn', method: :delete, title: "Stop impersonation", aria: { label: 'Stop impersonation' }, data: { toggle: 'tooltip', placement: 'bottom', container: 'body' } do

changelogs/unreleased/feature-change-signout-route.yml

+---
+title: Change 'Sign Out' route from a DELETE to a GET
+merge_request: 39708
+author: Joe Marty
+type: changed

config/initializers/devise.rb

@@ -195,7 +195,7 @@ Devise.setup do |config|
   config.navigational_formats = [:"*/*", "*/*", :html, :zip]
   # The default HTTP method used to sign out a resource. Default is :delete.
-  config.sign_out_via = :delete
+  config.sign_out_via = :get
   # ==> OmniAuth
   # To configure a new OmniAuth provider copy and edit omniauth.rb.sample