2 files changed, 14 insertions, 2 deletions
diff --git a/actionpack/lib/action_dispatch/http/parameters.rb b/actionpack/lib/action_dispatch/http/parameters.rb
index 31ef0af791..ddd15b748b 100644
--- a/actionpack/lib/action_dispatch/http/parameters.rb
+++ b/actionpack/lib/action_dispatch/http/parameters.rb
@@ -12,6 +12,14 @@ module ActionDispatch
         }
       }
 
+      # Raised when raw data from the request cannot be parsed by the parser
+      # defined for request's content mime type.
+      class ParseError < StandardError
+        def initialize
+          super($!.message)
+        end
+      end
+
       included do
         class << self
           attr_reader :parameter_parsers
@@ -91,7 +99,7 @@ module ActionDispatch
             my_logger = logger || ActiveSupport::Logger.new($stderr)
             my_logger.debug "Error occurred while parsing request parameters.\nContents:\n\n#{raw_post}"
 
-            raise ParamsParser::ParseError
+            raise ParseError
           end
         end
 
@@ -100,4 +108,8 @@ module ActionDispatch
         end
     end
   end
+
+  module ParamsParser
+    ParseError = ActiveSupport::Deprecation::DeprecatedConstantProxy.new("ActionDispatch::ParamsParser::ParseError", "ActionDispatch::Http::Parameters::ParseError")
+  end
 end
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index e4ef9783f3..9986d6e1e9 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -357,7 +357,7 @@ module ActionDispatch
         end
         self.request_parameters = Request::Utils.normalize_encode_params(pr)
       end
-    rescue ParamsParser::ParseError # one of the parse strategies blew up
+    rescue Http::Parameters::ParseError # one of the parse strategies blew up
       self.request_parameters = Request::Utils.normalize_encode_params(super || {})
       raise
     rescue Rack::Utils::ParameterTypeError, Rack::Utils::InvalidParameterError => e