`Pragma` is supposed to be a request header, but we've been including it in responses since the beginning of time. This is a relic dating all the way back to b2, probably originally added because Internet Explorer version 5 and earlier didn't understand the `Cache-Control` header in responses, but they did (incorrectly) obey the `Pragma` header. Internet Explorer 6 and 7 will obey the `Pragma` response header only if no other cache-related response headers are present (in our case, they are always present), and all other browsers ignore the `Pragma` response header. Props geekysoft. Fixes #37250. Built from https://develop.svn.wordpress.org/trunk@37944 git-svn-id: http://core.svn.wordpress.org/trunk@37885 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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