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@@ -501,6 +501,21 @@ You also have access to three instance variables in your functional tests:
* `@request` - The request
* `@response` - The response
+### Setting Headers and CGI variables
+
+Headers and cgi variables can be set directly on the `@request`
+instance variable:
+
+```ruby
+# setting a HTTP Header
+@request.headers["Accepts"] = "text/plain, text/html"
+get :index # simulate the request with custom header
+
+# setting a CGI variable
+@request.headers["HTTP_REFERER"] = "http://example.com/home"
+post :create # simulate the request with custom env variable
+```
+
### Testing Templates and Layouts
If you want to make sure that the response rendered the correct template and layout, you can use the `assert_template`