error parsing should be easier

[zpatrick]

Right now, you need to totally override the request reader if you want to read custom error types. It should be more simple to try and marshal into errors. Perhaps a request option:

var resp int
var myerr *MyCustomError
client.Get("/path", &resp, rclient.Error(&myerr))

Another option could map status codes to types:

client.Get("/path", &resp, rclient.StatusMap(
    series.Ints(200, 299): &someType,
    series.Ints(400, 499): &someError,
    series.Ints(500, 599): &someOtherError,
))