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由 Rafael Mendonça França 提交于
When you have a route that points to an nonexistent controller we raise an exception. This exception was being caught by the DebugExceptions middleware in development, but when trying to render the error page, we are reading the request format[[1][]]. To determine the request format we are reading the format parameters[[2][]], and to be able to read the parameters we need to encode them[[3][]]. This was raising another exception that to encode the parameter we try to load the controller to determine if we need to encode the parameters are binary[[4][]]. This new exception inside the DebugExceptions middleware makes Rails to render a generic error page. To avoid this new exception now we only encode the parameters when the controller can be loaded. Fixes #28892 [1]: https://github.com/rails/rails/blob/f52cdaac6336f99d13622ff9bda556a3124a4121/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb#L80 [2]: https://github.com/rails/rails/blob/f52cdaac6336f99d13622ff9bda556a3124a4121/actionpack/lib/action_dispatch/http/mime_negotiation.rb#L63 [3]: https://github.com/rails/rails/blob/f52cdaac6336f99d13622ff9bda556a3124a4121/actionpack/lib/action_dispatch/http/parameters.rb#L58 [4]: https://github.com/rails/rails/blob/f52cdaac6336f99d13622ff9bda556a3124a4121/actionpack/lib/action_dispatch/http/parameters.rb#L88
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