So the problem is only on the latest release. It's because the interface extends PSR-15 interface and method defined in the PSR-15 interface typehint against PST-15 interface, not as before interop interface. Basically 1.1.0 has a BC Break...
Refs http-interop/http-server-handler#12 by @webimpress
Please see these tests: https://travis-ci.org/zendframework/zend-stratigility/jobs/332049603#L644
So the problem is only on the latest release. It's because the interface extends PSR-15 interface and method defined in the PSR-15 interface typehint against PST-15 interface, not as before interop interface. Basically 1.1.0 has a BC Break...
Refs http-interop/http-server-handler#12 by @webimpress