HTTP post request asking for length

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Posted on 3 Apr 2025 09:47:31 by darren1372

So I am trying to make an HTTP post request to a service bus queue.
I have construct JSON payload action:

However I am getting "HTTP Error 411. The request must be chunked or have a content length"

I have tried turning on chunking. Didn't work
Have tried specifing a Content-Length header:

Then adding that value to the my Http post, as per below:
But keep getting the HTTP 411 error and Length Required error on the Http Post action
Any ideas how to resolve?

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Power Platform Build Tools

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Verified answer

sandeepstw 293 Super User 2025 Season 1 on 03 Apr 2025 at 10:03:04

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HTTP post request asking for length

You are getting "HTTP Error 411 Length Required" because the server (like Azure Service Bus) needs a Content-Length header, and Power Automate is not sending it properly when the request is not formed right.

1. Use HTTP method as POST
2. Do not manually add Content-Length header
3. In headers, only use content type as below

   {
   "Content-Type": "application/json"
   }
   and make sure your body is not empty, even send {} if you have nothing

4. if you are sending dynamic content, wrap it using string()
   example:
   {
   "data": "@{string(variables('yourJsonVariable'))}"
   }
5. Do not add Transfer-Encoding: chunked header
6. Let Power Automate calculate body size on its own
This should fix the 411 error.