This class is an abstract base class for implementations which provide retrieval of unformatted data objects.
DataProxy implementations are usually used in conjunction with an implementation of PhpExt_Data_DataReader (of the appropriate type which knows how to parse the data object) to provide a block of PhpExt_Data_Records to an PhpExt_Data_Store.
Custom implementations must implement the load method as described in PhpExt_Data_HttpProxy.load.
An implementation of Ext.data.DataProxy that reads a data object from a URL which may be in a domain other than the originating domain of the running page.