- Comments: Prevent users who can not see a post from seeing comments on it.
- Shortcodes: Restrict media shortcode ajax to certain type.
- REST API: Ensure no-cache headers are sent when methods are overridden.
- REST API: Limit `search_columns` for users without `list_users`.
- Prevent unintended behavior when certain objects are unserialized.
Merges [56833], [56834], [56835], [56836], and [56838] to the 5.1 branch.
Props xknown, jorbin, joehoyle, timothyblynjacobs, peterwilsoncc, ehtis, tykoted, antpb, rmccue.
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Fixes#38070, #37733 by reverting part of [38429] and using the fix in Requests.
Fixes#37992 allowing for connecting to SSL resources on ports other than 443.
Fixes#37991 by not sending default ports in the `Host:` header.
Fixes#37839 to match and decode Chunked responses correctly.
Fixes#38232 allowing a SSL connection to ignore the hostname of the certificate when verification is disabled.
Built from https://develop.svn.wordpress.org/trunk@38727
git-svn-id: http://core.svn.wordpress.org/trunk@38670 1a063a9b-81f0-0310-95a4-ce76da25c4cd