Eventstream: Event Hub POST Endpoint Now Fails with 500 Error

Hi Anonymous ,

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.