&pagesize is not working when using the API to pull information
RFC standards call for the initial URL argument being preceded with a question mark (?) and any additional URL arguments being preceded with an ampersand (&).
Example:
https://rally1.rallydev.com/slm/webservice/v2.0/attributedefinition/<Attribute Def OID>/AllowedValues?pagesize=200
OR
https://rally1.rallydev.com/slm/webservice/v2.0/attributedefinition/<Attribute Def Oid>/AllowedValues?pagesize=2000
https://rally1.rallydev.com/slm/webservice/v2.0/attributedefinition/<Attribute Def Oid>/AllowedValues?start=2001&pagesize=2000