--- /dev/null
+module Rack
+ class MethodOverride
+ HTTP_METHODS = %w(GET HEAD PUT POST DELETE OPTIONS)
+
+ METHOD_OVERRIDE_PARAM_KEY = "_method".freeze
+ HTTP_METHOD_OVERRIDE_HEADER = "HTTP_X_HTTP_METHOD_OVERRIDE".freeze
+
+ def initialize(app)
+ @app = app
+ end
+
+ def call(env)
+ if env["REQUEST_METHOD"] == "POST"
+ req = Request.new(env)
+ method = req.POST[METHOD_OVERRIDE_PARAM_KEY] ||
+ env[HTTP_METHOD_OVERRIDE_HEADER]
+ method = method.to_s.upcase
+ if HTTP_METHODS.include?(method)
+ env["rack.methodoverride.original_method"] = env["REQUEST_METHOD"]
+ env["REQUEST_METHOD"] = method
+ end
+ end
+
+ @app.call(env)
+ end
+ end
+end