Better error handling.

lib/async/rest/error.rb

@@ -26,7 +26,21 @@ class Error < StandardError
 		class RequestError < Error
 		end
 
+		class UnsupportedError < Error
+		end
+
 		class ResponseError < Error
+			def initialize(response)
+				super(response.read)
+
+				@response = response
+			end
+
+			def to_s
+				"#{@response}: #{super}"
+			end
+
+			attr :response
 		end
 	end
 end

lib/async/rest/representation.rb

@@ -116,7 +116,7 @@ def value!
 					@metadata = response.headers
 					@value = response.read
 				else
-					raise ResponseError, response.read
+					raise ResponseError, response
 				end
 			end
 

lib/async/rest/wrapper/generic.rb

@@ -36,6 +36,7 @@ def process_response(request, response)
 				end
 
 				def parser_for(response)
+					# It's not always clear why this error is being thrown.
 					return Unsupported
 				end
 
@@ -50,7 +51,7 @@ def wrap_response(response)
 
 				class Unsupported < HTTP::Body::Wrapper
 					def join
-						raise ResponseError, super
+						raise UnsupportedError, super
 					end
 				end
 			end