RayHttp is a PHP class that provides an HTTP client for sending requests to Web servers. It can configure and send HTTP GET and POST requests using the Curl extension or PHP file access functions. When using the Curl extension, all Curl options may be set changing a class array variable.
Guzzle is a RESTful Web service client framework that enables PHP developers to quickly build testable Web service clients utilizing HTTP/1.1 best practices. It gives you access to advanced features like persistent HTTP connections, parallel requests, exponential backoff, over the wire logging, MD5 validation, cookie jars, and a caching forward proxy.