[1] [CITE@en[PSR-7: HTTP message interfaces - PHP-FIG]]
([TIME[2020-06-05 00:48:38 +09:00]])
<https://www.php-fig.org/psr/psr-7/>

[2] [CITE@en[phly, boy, phly :: PSR-7 Accepted!]]
([[Matthew Weier O'Phinney]]著, [TIME[2015-05-19 12:00:00 +09:00]])
<https://mwop.net/blog/2015-05-18-psr-7-accepted.html>