Guzzle vs. Colossus

Guzzle is a PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services.

Colossus is a lightweight framework for building high-performance applications in Scala that require non-blocking network I/O. In particular Colossus is focused on low-latency stateless microservices where often the service is little more than an abstraction over a database and/or cache. For this use case, Colossus aims to maximize performance while keeping the interface clean and concise.