Remove old code that is done on the Openresty side

src/invidious/routes/switch_backend.cr

@@ -1,18 +0,0 @@
-{% skip_file if flag?(:api_only) %}
-
-module Invidious::Routes::BackendSwitcher
-  def self.switch(env)
-    referer = get_referer(env)
-    backend_id = env.params.query["backend_id"]
-
-    # Checks if there is any alternative domain, like a second domain name,
-    # TOR or I2P address
-    if alt = CONFIG.alternative_domains.index(env.request.headers["Host"])
-      env.response.cookies["SERVER_ID"] = Invidious::User::Cookies.server_id(CONFIG.alternative_domains[alt], backend_id)
-    else
-      env.response.cookies["SERVER_ID"] = Invidious::User::Cookies.server_id(CONFIG.domain, backend_id)
-    end
-
-    env.redirect referer
-  end
-end

src/invidious/routing.cr

@@ -21,7 +21,6 @@ module Invidious::Routing
       get "/privacy", Routes::Misc, :privacy
       get "/licenses", Routes::Misc, :licenses
       get "/redirect", Routes::Misc, :cross_instance_redirect
-      get "/switchbackend", Routes::BackendSwitcher, :switch
 
       self.register_channel_routes
       self.register_watch_routes

src/invidious/user/cookies.cr

@@ -45,18 +45,5 @@ struct Invidious::User
         samesite: HTTP::Cookie::SameSite::Lax
       )
     end
-
-    # Server ID (SERVER_ID) cookie used for Sticky Sessions
-    # Parameter "domain" comes from the global config
-    def server_id(domain : String?, server_id) : HTTP::Cookie
-      return HTTP::Cookie.new(
-        name: "SERVER_ID",
-        domain: domain,
-        value: server_id,
-        secure: false,
-        http_only: true,
-        samesite: HTTP::Cookie::SameSite::Lax
-      )
-    end
   end
 end