Provides getErrors() method for Response class, so you can work with array of errors form response.

[akhromium]

I's great to have array or errors, so you can parse errors messages and perform additional actions. As example: you pass some non-existing (in some cases) custom fields in getLeadByFilterType request, marketo will returns 2 errors. You can parse them, delete from request and try again, but you need array of error messages to get incorrect field names.