Preparation for `Roda` 2¶ ↑

In Roda 2 (the next version), the PATH_INFO and SCRIPT_NAME env variables will not be modified during routing. Instead, Roda will use the static_path_info plugin behavior by default. Users are strongly encouraged to use the static_path_info plugin to make sure their apps will work with Roda 2.
In Roda 2, Roda#initialize will take the env hash, and call will take the route block. The private _route method will be eliminated. This should not affect applications, but it will affect plugins that override these methods.
The issues mentioned below should all have deprecation warnings, except where noted.

New Plugins to Replace Deprecated Features¶ ↑

RodaResponse#set_cookie and delete_cookie have been moved to the cookies plugin.
Roda.request_module and .response_module have been moved to the module_include plugin.
Roda.hash_matcher has been moved to the hash_matcher plugin.
The :extension hash matcher has been moved to the path_machers plugin. This plugin also contains new :prefix and :suffix hash matchers.
The :param and :param! hash matchers have been moved to the param_matchers plugin.

The :opts render plugin option and :opts option to render and view are now deprecated. Use the :template_opts option instead.
RodaRequest#full_path_info has been deprecated, switch to using path.
Mutating plugin option hashes for the chunked, default_headers, error_email, json, and render plugins is now deprecated, these option hashes will be frozen in Roda 2.
The :header hash matcher in the header_matchers plugin now gives a deprecation warning, because in Roda 2, the matcher will yield the value of the header to the block. To get the new behavior and silence the deprecation warning, you need to set an option:
```
Roda.opts[:match_header_yield] = true
```
Mutating json_result_classes directly in the json plugin is now deprecated. You should now pass a :classes option to the plugin specifying the classes to convert, if you want to handle classes other than Array and Hash. There will not be a deprecation warning if you attempt to mutate json_result_classes.

The Roda.freeze method now freezes internal datastructures to avoid thread safety issues. The plugins that ship with Roda will freeze their datastructures when Roda.freeze is called. It is recommended that production applications call freeze on the application after fully loading it, especially if they are using a threaded webserver and a non-MRI ruby.
A delete_empty_headers plugin has been added that automatically deletes headers set to the empty string. This makes it simpler to delete default headers if they shouldn’t be set for a specific request.
A class_delegate method has been added to the delegate plugin. This makes it easier to create instance methods that call class methods.
Roda::RodaMajorVersion, RodaMinorVersion, and RodaPatchVersion constants have been added.

The error_handler plugin now uses a new response instead of reusing the existing response. This fixes cases where changing the Content-Type and then raising an exception would result in a error page that used the previously set Content-Type.
The not_found plugin now clears previous set headers before calling not found. This fixes cases where Content-Type was set previously, and also fixes an incorrect Content-Length being used for the response.
The static_path_info plugin now restores the original SCRIPT_NAME and PATH_INFO before returning from r.run, fixing usage with some middleware.
The multi_run plugin now works when subclassing the app.
The default_headers plugin is now faster by skipping an unnecessary hash duplication.
A Gemfile has been added to make development slightly easier.

RodaResponse is no longer a subclass of Rack::Response, it is now a subclass of Object. This shouldn’t have an effect unless you were calling a method on an instance that was defined by Rack::Response and not RodaResponse, but most of those methods would have raised exceptions.