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Adding notes on JSON content-type header (#17902)

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I noticed that the `trigger.json` key wasn't accessible unless I explicitly set the `Content-Type` header, so adding my discoveries to the documentation.

Let me know if anything needs to be tweaked!
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Jordan Kueh 2021-05-25 21:06:33 +10:00 committed by GitHub
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@ -653,6 +653,12 @@ Webhook endpoints don't require authentication, other than knowing a valid webho
Note that a given webhook can only be used in one automation at a time. That is, only one automation trigger can use a specific webhook ID.
In order to reference `trigger.json`, the `Content-Type` header must be specified with a value of `application/json`, e.g.:
```bash
curl -X POST -H "Content-Type: application/json" https://your-home-assistant:8123/api/webhook/some_hook_id
```
## Zone trigger
Zone trigger fires when an entity is entering or leaving the zone. The entity can be either a person, or a device_tracker. For zone automation to work, you need to have setup a device tracker platform that supports reporting GPS coordinates. This includes [GPS Logger](/integrations/gpslogger/), the [OwnTracks platform](/integrations/owntracks/) and the [iCloud platform](/integrations/icloud/).