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Curl to create API subscriptions failing with 400 Bad Request

‎10-13-2023 12:45

‎10-13-2023 12:45

I am trying to create a subscription. I have verified my subscription API. I am using this curl given in documentation here to create a new subscription, but it is failing with 400 Bad request. Please help

Curl command

curl -X POST "https://api.fitbit.com/1/user/-/body/apiSubscriptions/9pgqWLScRzNuJ8C5HZwp4WizuG92.json" \
-H "accept: application/json" \
-H "Authorization: Bearer <a valid token>" \
-H "content-length: 10000"

This is the response 

<html>
<head><title>400 Bad Request</title></head>
<body>
<center><h1>400 Bad Request</h1></center>
<hr><center>cloudflare</center>
</body>
</html>
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2 REPLIES 2

‎10-15-2023 21:08

‎10-15-2023 21:08

I figured it out the content-length value needs to be 0 because we are not sending any content with this post request. Bad API design IMO

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‎10-16-2023 12:26

In response to genepathdx_dev

‎10-16-2023 12:26

Hi @genepathdx_dev 

According to RFC 7230, section 3.3.2, the POST HTTP requests requires the Content-Length header field containing the anticipated size of the payload body.  The subscription endpoint does not have a payload body, therefore the size is 0 (zero).  The API is designed correctly.

Gordon Crenshaw
Senior Technical Solutions Consultant
Fitbit Partner Engineering & Web API Support | Google
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