Types of backend services and API clients

[#1]

Hello all,

Sorry for the beginners question.

Could you please help me understand the main functionality and purpose of Apigee products.

Namely,

1) is it designed for / possible to expose non-HTTP[s] backend service using Apigee APIs and proxies?

2) are any other than HTTP[s] clients currently supported, (e.g. MQTT)?

Thank you!