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-rw-r--r--guides/source/api_app.md17
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diff --git a/guides/source/api_app.md b/guides/source/api_app.md
index 0598b9c7fa..8dba914923 100644
--- a/guides/source/api_app.md
+++ b/guides/source/api_app.md
@@ -166,6 +166,23 @@ class definition:
config.api_only = true
```
+In `config/environments/development.rb`, set `config.debug_exception_response_format`
+to configure the format used in responses when errors occur in development mode.
+
+To render an HTML page with debugging information, use the value `:default`.
+
+```ruby
+config.debug_exception_response_format = :default
+```
+
+To render debugging information preserving the response format, use the value `:api`.
+
+```ruby
+config.debug_exception_response_format = :api
+```
+
+By default, `config.debug_exception_response_format` is set to `:api`.
+
Finally, inside `app/controllers/application_controller.rb`, instead of:
```ruby