Add body to webhook

[oldnotdead]

I am having trouble understanding webhooks. I’ve read the tutorials, but need help.i want to insert a header (“body”:”test”) in this webhook, but can’t get it to work

https://dashboard.hologram.io/api/1/devices/messages/1030683/f51ca81e536993bf93355cd77c8a1456w

Please help.

[Reuben]

That link doesn’t work for me.
But did you fill this into the webhook builder:

That will put a header named body with a value of “test” on every request