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When parsing HTTP request parameters, Rails delegates to a set of parsing strategies based on the MIME type. If any of these strategies raises an error Rails rescues it and raises an instance of `ActionDispatch::Http::Parameters::ParseError` with the same message as the underlying error. However, in the presence of malformed JSON, the default parameter parser for the `application/json` MIME type raises a `JSON:ParserError` with a message containing the entire malformed JSON string (the request body in this context). By raising a new error with this same message Rails inadvertently ends up logging the full HTTP request body at the `fatal` level. This request body could contain sensitive information or could be intentionally crafted to be extremely large. This commit sets the `ActionDispatch::Http::Parameters::ParseError` message to a static message which mirrors that of the corresponding `debug` log. |
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README.rdoc |
= Action Pack -- From request to response Action Pack is a framework for handling and responding to web requests. It provides mechanisms for *routing* (mapping request URLs to actions), defining *controllers* that implement actions, and generating responses. In short, Action Pack provides the controller layer in the MVC paradigm. It consists of several modules: * Action Dispatch, which parses information about the web request, handles routing as defined by the user, and does advanced processing related to HTTP such as MIME-type negotiation, decoding parameters in POST, PATCH, or PUT bodies, handling HTTP caching logic, cookies and sessions. * Action Controller, which provides a base controller class that can be subclassed to implement filters and actions to handle requests. The result of an action is typically content generated from views. With the Ruby on Rails framework, users only directly interface with the Action Controller module. Necessary Action Dispatch functionality is activated by default and Action View rendering is implicitly triggered by Action Controller. However, these modules are designed to function on their own and can be used outside of Rails. You can read more about Action Pack in the {Action Controller Overview}[https://guides.rubyonrails.org/action_controller_overview.html] guide. == Download and installation The latest version of Action Pack can be installed with RubyGems: $ gem install actionpack Source code can be downloaded as part of the Rails project on GitHub: * https://github.com/rails/rails/tree/main/actionpack == License Action Pack is released under the MIT license: * https://opensource.org/licenses/MIT == Support API documentation is at: * https://api.rubyonrails.org Bug reports for the Ruby on Rails project can be filed here: * https://github.com/rails/rails/issues Feature requests should be discussed on the rails-core mailing list here: * https://discuss.rubyonrails.org/c/rubyonrails-core