Allow GET requests to trigger webhooks

It’s possible that your proxy configuration is interfering; I don’t know anything about proxies. And it’s possible that your way can work, using the event platform, but I haven’t used that.

Here’s how I have a (working) webhook set up:

automation:
  - id: action_toggle_living_room_swag_light
    alias: "[WEBHOOK] Toggle Living Room swag light"
    trigger:
      - platform: webhook
        webhook_id: the_secret_webhook_string
        allowed_methods: 
          - POST
          - GET
        local_only: true
      - platform: event
        event_type: ios.action_fired
        event_data:
          actionName: Toggle Swag Light
    action:
      - service: script.toggle_switched_light
        data:
          which: light.smart_switch_2_living_room

thank for your replay,

Finally, I get it working now,

What I did: Just follow the normal webhook setup process

alias: webhook test
description: ""
trigger:
  - platform: webhook
    allowed_methods:
      - POST
      - PUT
      - GET
    local_only: false
    webhook_id: "-9l451In8r-VszsOd5ewvM"
condition: []
action:
  - service: light.toggle
    data: {}
    target:
      entity_id: light.toilet
mode: single

My environment :
NGINX Reverse Proxy (https://homeassistant.example.com) → Home assistant IP:port
After setup as above, I can click https://homeassistant.example.com/api/webhook/-9l451In8r-VszsOd5ewvM to trigger the action.

If it is still relevant, I developed an integration which brings Akuvox SmartPlus door camera feeds and door relay buttons into Home Assistant. With the integration you should have a button which will trigger the door relay to open:

Did you manage to get this working ?