Feed Delta Updates

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Your feed subscribers have already read your old posts or they’ve been cached in their feed readers already. Stop wasting bandwidth and only return the posts published since supporting feed reader last requested a feed update. As a nice bonus, this plugin will decrease the number of false cache misses for all your feeds. Known problems This section addresses some known problems and some known solutions to those problems as well. All new posts added since the `If-Last-Modified` timestamp aren’t included in my delta updates! Indeed, they may not be. The “Syndication feeds show the most recent” setting in WordPress is respected to avoid delta updates being used to extract all the content out of a website by providing a timestamp from a decade ago. Feed reader clients will generally check feeds often enough to receive all the deltas as they appear in the feed anyway. Please consider increasing the max setting limit now that you’re using feeds with delta updates. Old posts are resurfacing in my feeds! Indeed, that can happen – but lets look at why it happens. Posts that have been published within the last week may reappear in a delta update if the post has been modified since the feed was last updated. Feed reader clients are expected to handled updated posts, and the delta update is expected to include updated posts. You can avoid pushing out minor post modifications, such as spelling corrections, and improve on caching by installing the Minor Edits plugin. This plugin will suppress changes to a post’s modification time for minor updates. Posts older than one week aren’t considered “news worthy” any longer and wouldn’t be included in a delta update even with significant modifications.