ResponseWriter adds a new function ErrorCustom
to produces a custom error response.
#174
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Our RESTful apis usually have custom error code when the request failed. But the custom err code is not equal to http status code which specified in RFC document. If we use custom status code instead of regular http status code , some iOS networking framework e.g. AFNetworking do not supported it, so we need a new function rest.ErrorCustom like this: