[1] PSR-7: HTTP message interfaces - PHP-FIG (6/4/2020, 3:48:38 PM) https://www.php-fig.org/psr/psr-7/

[2] phly, boy, phly :: PSR-7 Accepted! (Matthew Weier O'Phinney著, 5/19/2015, 3:00:00 AM) https://mwop.net/blog/2015-05-18-psr-7-accepted.html