Title: Version 9.2.0
Last modified: August 2, 2026

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# Version 9.2.0

 *  Resolved [nexxtpress](https://wordpress.org/support/users/nexxtpress/)
 * (@nexxtpress)
 * [1 week ago](https://wordpress.org/support/topic/version-9-2-0/)
 * Version 9.2.0 seems to have broken federation on my blog.
   When I search for a
   link to a previously posted/federated post, i.e. on Mastodon, it returns “No 
   results.” (“Keine Ergebnisse”) Whereas rolling the plugin back to Version 9.1.0
   returns the full post again.I am not using any other cache plugins than “**Redis
   Object Cache**” (Version 2.8.0) and “**Surge**” (Version 1.2.1).

Viewing 6 replies - 1 through 6 (of 6 total)

 *  Plugin Author [Matthias Pfefferle](https://wordpress.org/support/users/pfefferle/)
 * (@pfefferle)
 * [1 week ago](https://wordpress.org/support/topic/version-9-2-0/#post-18981663)
 * hey [@nexxtpress](https://wordpress.org/support/users/nexxtpress/) 👋
 * is it only for existing blog posts or also new ones? Can you tell me which blog
   you have issues with?
 *  Plugin Author [Matthias Pfefferle](https://wordpress.org/support/users/pfefferle/)
 * (@pfefferle)
 * [1 week ago](https://wordpress.org/support/topic/version-9-2-0/#post-18981665)
 * If it is about nexxtpress.de, can you tell me what version is currently installed?
 *  Thread Starter [nexxtpress](https://wordpress.org/support/users/nexxtpress/)
 * (@nexxtpress)
 * [1 week ago](https://wordpress.org/support/topic/version-9-2-0/#post-18981667)
 * Hej [@pfefferle](https://wordpress.org/support/users/pfefferle/), I just turned
   on Version 9.2.0 again. Try [https://nexxtpress.de/mediathekperlen/nicolas-cage-ghost-rider-2007/](https://nexxtpress.de/mediathekperlen/nicolas-cage-ghost-rider-2007/)(
   last post in the blog).
 * WordPress Version 7.0.2
    -  This reply was modified 1 week ago by [nexxtpress](https://wordpress.org/support/users/nexxtpress/).
      Reason: added WordPress Version
 *  Plugin Author [Matthias Pfefferle](https://wordpress.org/support/users/pfefferle/)
 * (@pfefferle)
 * [1 week ago](https://wordpress.org/support/topic/version-9-2-0/#post-18981686)
 * I found the issue, and I am really sorry!
 * It comes from a change I made to how the plugin decides whether a request is 
   an ActivityPub request or a normal page view. To work better together with a 
   caching layer, I made that check stricter: it now only treats a request as ActivityPub
   when the Accept header asks for JSON and nothing else.
 * The problem is that Mastodon also lists `text/html` in its Accept header, just
   with a very low priority. My stricter check saw that `text/html` and stopped 
   recognizing the request as ActivityPub, so the plugin returned the normal HTML
   page instead of the JSON, and the posts no longer resolved.
 * I only tested with a plain `application/activity+json` header, not with the one
   Mastodon actually sends, so I missed it. Compatibility in WordPress is hard!
 * I will roll the change back so federation works again, and fix the third party
   caching plugin properly instead. Thanks a lot for the report and for your patience.
    -  This reply was modified 1 week ago by [Matthias Pfefferle](https://wordpress.org/support/users/pfefferle/).
 *  Thread Starter [nexxtpress](https://wordpress.org/support/users/nexxtpress/)
 * (@nexxtpress)
 * [1 week ago](https://wordpress.org/support/topic/version-9-2-0/#post-18981689)
 * Ahh! That’s great, Matthias! Thank you very much (as always!) for the quick turnaround!
 *  Plugin Author [Matthias Pfefferle](https://wordpress.org/support/users/pfefferle/)
 * (@pfefferle)
 * [1 week ago](https://wordpress.org/support/topic/version-9-2-0/#post-18981732)
 * It will go live with the next version I planned for Monday: [https://github.com/Automattic/wordpress-activitypub/pull/3601](https://github.com/Automattic/wordpress-activitypub/pull/3601)

Viewing 6 replies - 1 through 6 (of 6 total)

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 * 6 replies
 * 2 participants
 * Last reply from: [Matthias Pfefferle](https://wordpress.org/support/users/pfefferle/)
 * Last activity: [1 week ago](https://wordpress.org/support/topic/version-9-2-0/#post-18981732)
 * Status: resolved