wordpress-develop

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T

Rachel Baker ea3b41d8e3 Feeds: Always return a valid timestamp for the Last-Modified header of comment or post feeds.

Fixes bug where an invalid Last-Modified value would be returned in feed requests for sites that had 0 items to return. Comment or post feeds will now return the current timestamp as the Last-Modified header value.  Example: a request for the comments feed for a site without any comments.

Replaced use of the local static variable `$cache_lastcommentmodified` to store the modified date in `get_lastcommentmodified()` with the Object Cache API.  The `get_lastcommentmodified()` function returns early if there is a cached value and returns `false` if there where no comments found. Introduced `_clear_modified_cache_on_transition_comment_status()` to flush the `lastcommentmodified` cache key when a comment enters or leaves approval status. In `get_lastpostmodified()` return early if there is a cached value and return `false` if there are no posts found.

Props swissspidy, rachelbaker, dllh, leobaiano.
Fixes #38027.

git-svn-id: https://develop.svn.wordpress.org/trunk@38925 602fd350-edb4-49c9-b593-d223f7449a82

2016-10-25 20:47:06 +00:00