PSR-7 HTTP Message Interface has been kicking around in one form or another since March of 2012. Get a brief history of how PSR-7 evolved from its humble beginnings as a simple HTTP client interface to the game-changing PHP-FIG proposal we have today. Learn how to work with the HTTP Message Interfaces and how they will be used by frameworks in the not to distant future. Find out what it will mean to have a healthy ecosystem of PHP software all speak HTTP the same way. Say hello to your new best friend in PHP, PSR-7.