Webhook Relay
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URLEncoded Form Data

Webhook Relay automatically parses url encoded form data if Content-Type: application/x-www-form-urlencoded
Webhook Relay detects application/x-www-form-urlencoded requests and automatically parses them so your function can use it. Parsed form data can be accessed through r.RequestFormData variable. For example if the payload looks like this:
name=john&lastname=wick
Then you can access the form elements and use them to create a new payload:
local json = require("json")
​
local encoded_payload = {
name= r.RequestFormData.name[1],
lastname=r.RequestFormData.lastname[1]
}
local encoded_payload, err = json.encode(encoded_payload)
if err then error(err) end
​
r:SetRequestHeader("Content-Type", "application/json")
r:SetRequestBody(encoded_payload)
This would transform the webhook into:
{
"name": "john",
"lastname": "wick"
}

Nested forms

If your form contains nested fields such as &campaign%5Bid%5D=98 you can access them directly as well:
r:SetRequestBody(r.RequestFormData["campaign[id]"][1])