Eventstream: Event Hub POST Endpoint Now Fails with 500 Error

[kurnivan_ny]

Facing an issue with sending data via a custom HTTP endpoint with Event Hub integration. Before August 1, 2025, I successfully sent data to the event stream, but now I'm encountering a 500 Internal Server Error. Can anyone suggest a solution? I'm using the Python SDK, which worked previously, but now I'm limited to using POST HTTP requests for my project.

[v-agajavelly]

Hi @kurnivan_ny ,

I hope the response provided helped in resolving the issue. If you still have any questions, please let us know we are happy to address.

Regards,
Akhil.

[v-agajavelly]

Hi @kurnivan_ny ,

Following up to see if you were able to run the minimal POST test and check the headers/payload. If the 500 error is still persisting, we can dig deeper maybe try an alternate tool like Postman or validate the Event Hub policy settings. Let me know, happy to help troubleshoot further.


Regards,
Akhil.

[v-agajavelly]

Hi @kurnivan_ny ,

Just checking in to see if you had a chance to try the minimal POST test and review the payload/headers as suggested. That’s often the quickest way to narrow down whether the 500 is caused by the request format itself or something else in the pipeline. Did making those adjustments help get the Event Hub POST working again

Regards,
Akhil.

[v-agajavelly · Accepted solution]

Hi @kurnivan_ny ,

To resolve your issue with the Event Hub POST endpoint returning a 500 Internal Server Error (which started after August 1, 2025), here’s the essential troubleshooting step to try first.

Check and Update Your HTTP POST Payload and Headers. A 500 error frequently means the request format no longer matches what Event Hub expects likely caused by a recent service or API change.

Try bellow debugging  steps

1.Double-check your POST request, especially:

• The URL:
  Should be in the format

https://<namespace>.servicebus.windows.net/<eventhub>/messages

• Required headers:
• Authorization (SAS token or Bearer token)
• Content-Type: application/json
• The body.

{"body":"Test event"}

or, if sending raw data, ensure it’s correctly encoded.

2. Try a minimal working POST with a tool like Postman. If this succeeds, your original payload or headers have an incompatibility. If correcting the payload and headers doesn’t solve the problem, check for Azure Event Hub’s most recent [API documentation] for any updated requirements, as you may need to adjust your request format due to backend changes.

Regards,
Akhil.