Add extension hook simplepie_after_init (#7007)

* Add extension hook simplepie_after_init
fix https://github.com/FreshRSS/FreshRSS/issues/7006

* Add documentation note

* fix doc get_headers

* Syntax void

* Forgotten code

1 files changed, 4 insertions, 1 deletions

diff --git a/docs/en/developers/03_Backend/05_Extensions.md b/docs/en/developers/03_Backend/05_Extensions.md
index f83d8eef7..2a4c4dcf0 100644
--- a/docs/en/developers/03_Backend/05_Extensions.md
+++ b/docs/en/developers/03_Backend/05_Extensions.md
@@ -178,7 +178,10 @@ The following events are available:
 * `nav_menu` (`function() -> string`): will be executed if the navigation was built.
 * `nav_reading_modes` (`function($reading_modes) -> array | null`): **TODO** add documentation.
 * `post_update` (`function(none) -> none`): **TODO** add documentation.
-* `simplepie_before_init` (`function($simplePie, $feed) -> none`): **TODO** add documentation.
+* `simplepie_after_init` (`function(\SimplePie\SimplePie $simplePie, FreshRSS_Feed $feed, bool $result): void`): Triggered after fetching an RSS/Atom feed with SimplePie. Useful for instance to get the HTTP response headers (e.g. `$simplePie->data['headers']`).
+* `simplepie_before_init` (`function(\SimplePie\SimplePie $simplePie, FreshRSS_Feed $feed): void`): Triggered before fetching an RSS/Atom feed with SimplePie.
+
+> ℹ️ Note: the `simplepie_*` hooks are only fired for feeds using SimplePie via pull, i.e. normal RSS/Atom feeds. This excludes WebSub (push), and the various HTML or JSON Web scraping methods.
 
 ### Injecting CDN content