Revert "Merge pull request #3640 from indirect/remote_ip"

This reverts commit 6491aadc52, reversing
changes made to 83bf0b626c.

See https://github.com/rails/rails/pull/3640#issuecomment-2752761 for
explanation.

actionpack/lib/action_dispatch/http/request.rb

@@ -155,9 +155,10 @@ module ActionDispatch
       @ip ||= super
     end
 
-    # Originating IP address from the RemoteIp middleware.
+    # Originating IP address, usually set by the RemoteIp middleware.
     def remote_ip
-      @remote_ip ||= @env["action_dispatch.remote_ip"]
+      # Coerce the remote_ip object into a string, because to_s could return nil
+      @remote_ip ||= @env["action_dispatch.remote_ip"].to_s || ip
     end
 
     # Returns the unique request id, which is based off either the X-Request-Id header that can

actionpack/lib/action_dispatch/middleware/remote_ip.rb

@@ -55,10 +55,7 @@ module ActionDispatch
             "HTTP_X_FORWARDED_FOR=#{@env['HTTP_X_FORWARDED_FOR'].inspect}"
         end
 
-        not_proxy = client_ip || forwarded_ips.last || remote_addrs.first
-
-        # Return first REMOTE_ADDR if there are no other options
-        not_proxy || ips_from('REMOTE_ADDR', :all).first
+        client_ip || forwarded_ips.last || remote_addrs.first
       end
 
       def to_s
@@ -69,9 +66,9 @@ module ActionDispatch
 
     protected
 
-      def ips_from(header, allow_proxies = false)
+      def ips_from(header)
         ips = @env[header] ? @env[header].strip.split(/[,\s]+/) : []
-        allow_proxies ? ips : ips.reject{|ip| ip =~ @middleware.proxies }
+        ips.reject{|ip| ip =~ @middleware.proxies }
       end
     end