2 files changed, 9 insertions, 8 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb b/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb
index 7912b5ce82..642c7183cc 100644
--- a/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb
+++ b/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb
@@ -38,10 +38,10 @@ module ActionDispatch
       end
     end
 
-    def initialize(app, routes_app = nil, api_only = false)
-      @app        = app
-      @routes_app = routes_app
-      @api_only   = api_only
+    def initialize(app, routes_app = nil, response_format = :default)
+      @app             = app
+      @routes_app      = routes_app
+      @response_format = response_format
     end
 
     def call(env)
@@ -67,9 +67,10 @@ module ActionDispatch
       log_error(request, wrapper)
 
       if request.get_header('action_dispatch.show_detailed_exceptions')
-        if @api_only
+        case @response_format
+        when :api
           render_for_api_application(request, wrapper)
-        else
+        when :default
           render_for_default_application(request, wrapper)
         end
       else
diff --git a/actionpack/test/dispatch/debug_exceptions_test.rb b/actionpack/test/dispatch/debug_exceptions_test.rb
index d9c6233511..159bf10545 100644
--- a/actionpack/test/dispatch/debug_exceptions_test.rb
+++ b/actionpack/test/dispatch/debug_exceptions_test.rb
@@ -213,7 +213,7 @@ class DebugExceptionsTest < ActionDispatch::IntegrationTest
   end
 
   test "rescue with json error for API request" do
-    @app = ActionDispatch::DebugExceptions.new(Boomer.new(true), RoutesApp, true)
+    @app = ActionDispatch::DebugExceptions.new(Boomer.new(true), RoutesApp, :api)
 
     get "/", headers: { 'action_dispatch.show_exceptions' => true }
     assert_response 500
@@ -254,7 +254,7 @@ class DebugExceptionsTest < ActionDispatch::IntegrationTest
   end
 
   test "rescue with json on API request returns only allowed formats or json as a fallback" do
-    @app = ActionDispatch::DebugExceptions.new(Boomer.new(true), RoutesApp, true)
+    @app = ActionDispatch::DebugExceptions.new(Boomer.new(true), RoutesApp, :api)
 
     get "/index.json", headers: { 'action_dispatch.show_exceptions' => true }
     assert_response 500