FIX: error in response body to blocked crawlers, showing 500 Internal Server Error with status of 403

lib/middleware/anonymous_cache.rb

@@ -201,7 +201,7 @@ module Middleware
 
       if helper.blocked_crawler?
         env["discourse.request_tracker.skip"] = true
-        return [403, {}, "Crawler is not allowed!"]
+        return [403, {}, ["Crawler is not allowed!"]]
       end
 
       if helper.should_force_anonymous?

spec/components/middleware/anonymous_cache_spec.rb

@@ -167,7 +167,7 @@ describe Middleware::AnonymousCache::Helper do
         "PATH_INFO" => path,
         "REQUEST_PATH" => path
       }.merge(options[:headers]))
-      @status = middleware.call(@env).first
+      @status, @response_header, @response = middleware.call(@env)
     end
 
     it "applies whitelisted_crawler_user_agents correctly" do
@@ -184,6 +184,7 @@ describe Middleware::AnonymousCache::Helper do
       }
 
       expect(@status).to eq(403)
+      expect(@response).to be_an(Array)
 
       get '/', headers: non_crawler
       expect(@status).to eq(200)