Consider reordering or refactoring prefilters to allow greater control

[dcneiner]

The current use case for having the data prefilter before the url parsing prefilter is that it would allow you to create temporary keys for use in the URL prefilter. If the URL prefilter runs first, it removes data and you cannot reuse those keys in the dataMap. However, I'd also like to see greater control over being able to turn off/replace prefilters easily without having to do anything crazy with amplify unsubscribe.