[ENH] Notifications : Apprise Support

[timkeefer1]

Love the project and THANK YOU for the new enhancements with the new version. I run Apprise as my notification service, which supports POST methods with JSON payloads. I'm getting a 400 error when I try and just stuff the webhook into apprise. I think it may be because the payload body is different from what Apprise is expecting?

environment variable:

- HTTP_RECEIVER=https://apprise.mydomain.com/notify/apprise

time=2026-02-01T08:12:45.409-05:00
level=ERROR
msg=notification failed
err=http: failed to send HTTP notification: send notification\nsend to https://apprise.mydomain.com/notify/apprise: responded with status code: 400

Here's the example that Apprise gives for when using with a CURL (my key is 'apprise'):

curl -X POST \
    -F "tag=all" \
    -F "body=test body" \
    -F "title=test title" \
    "https://apprise.mydomain.com/notify/KEY"

In any case, I'm not a true developer, just a hack - so my diagnosis here may be wrong!
Also, would be amazing if there was a way to also customize the notification texts - I often use e-mail as a destination for notifications, and being able to customize the TITLE is useful so that I don't have to open each e-mail to see what happened.