FitBit Subscriptions API: create subscription endpoint returns "Error: read ECONNRESET"

[Dominico3245]

I am trying to create a subscription by sending the following request:

POST https://api.fitbit.com/1/user/-/activities/apiSubscriptions/1.json

But I keep getting the following error:

Error: read ECONNRESET

Network Request Headers

content-length: 10000000

X-Fitbit-Subscriber-Id: fitbit-subscription-handler

Authorization: Bearer <valid_access_token>

User-Agent: PostmanRuntime/7.30.0

Accept: */*

Cache-Control: no-cache

Postman-Token: <valid_postman_token>

Host: api.fitbit.com Accept-Encoding: gzip, deflate, br

Connection: keep-alive

[Dominico3245 · Accepted solution]

According to Fitbit's official documentation, the `content-length` header is required as shown in the image:

Simply removing this required header fixes the issue.