L

VAPI•2mo ago

ltd-scarlet

How to send application/x-www-form-urlencoded with Function/API Request Tools?

Hi VAPI team,

I'm trying to integrate Twilio Verify API which requires application/x-www-form-urlencodedapplication/x-www-form-urlencoded format for POST requests, but I'm having trouble with VAPI tools.

WHAT I NEED TO SEND:
POST https://verify.twilio.com/v2/Services/{ServiceSid}/Verifications
Content-Type: application/x-www-form-urlencoded
Body: To=+13417668501&Channel=sms

WHAT I'VE TRIED:

1. API Request Tool:
   • Set Content-Type header to application/x-www-form-urlencoded
   • Configured body properties (To, Channel)
   • Result: Twilio returns error 20001 "Missing required parameters"
   • The body data isn't being sent
2. Found this Discord thread saying API Request tools are hardcoded to JSON:https://discord.com/channels/.../API-Request-Tool-adds-default-Content-TypeKyle mentioned "function tool will allow you to customize the header"
3. Function Tool:
   • Added Content-Type: application/x-www-form-urlencoded header
   • Configured parameters (To, Channel)
   • Result: "No result returned" error
   • Seems Function Tools expect to call my server, not external APIs?

QUESTIONS:

1. Is it possible to send form-encoded POST requests directly to external APIs with VAPI tools?
2. If yes, what's the correct configuration?
3. If no, do I need to create a backend proxy that reformats the request?

The API works perfectly in Postman with form-encoded data, just can't figure out how to make VAPI send that format.

Any guidance would be greatly appreciated!

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