Make.com limitation with multipart/mixed request (works in Bruno, fails in Make)

Kehinde_Akinwumi · January 31, 2026, 10:30am

What is your goal?

succese with the request

What is the problem & what have you tried?

Hi everyone,
I’m facing an issue with an HTTP integration in Make.com and would like to confirm whether this is a platform limitation.

I’m integrating Make.com with an external API (Techniker Krankenkasse – TK).
The API expects the request in the following format:
Content-Type: multipart/mixed
A fixed boundary
A multipart part named neuaufnahme
Content-Type: application/json inside that part
Authentication via Authorization: Bearer
Session cookie nsj
This request works 100% correctly in Bruno, using a raw multipart/mixed body.
Example (working in Bruno)
Header: Content-Type: multipart/mixed; boundary=xxx
Body: raw multipart with boundary and JSON payload
Response: valid JSON returned by API

Does Make.com currently support sending raw multipart/mixed requests with a custom

Error messages or input/output bundles

Problem in Make.com
multipart/form-data does not work
Custom body does not create a real multipart request
API responds with:
403 Forbidden (HTML response), or
No application data included in the request
It seems Make does not actually send a real multipart/mixed request

Screenshots (scenario flow, mo

dule settings, errors)

Msquare_Automation · January 31, 2026, 11:07am

Hi @Kehinde_Akinwumi ,

To help us better understand and analyze the problem, it would be very helpful if you could provide screenshots of the module flow and the overall scenario flow. This will allow us to clearly understand how the scenario is structured and how each module is interacting and the cause of error.

Best regards,
Msquare Automation
Platinum Partner of Make
@Msquare_Automation

Kehinde_Akinwumi · January 31, 2026, 11:33am

hi thank for replying my question, this

is my scenario flow the first http request is just create the getApiaccess token

Msquare_Automation · February 2, 2026, 5:25am