my simple controller method with post verb return 404 bad request

Thanks tahir for the response about network I might not be very clear when I went to my network team they said if telnet is ok then all is ok and the statistics shows the request send successfully .what else I could test at network side is there any way to get the exact reason of the issue of this bad request error 

he 400 Bad Request error typically indicates a problem with the request being sent, but as you've mentioned that there have been no changes in the code or the API.

1. Headers or Content: The request headers or content being sent might be interpreted differently by the server. Ensure that the headers and payload sent match the expected format by the third-party service.

2. Request Format: Sometimes, slight variations in how the request is structured can cause issues. Check the content type, encoding, and payload structure to align with the API's requirements.

3. Encoding or Character Issues: Look out for changes in encoding or unexpected characters in the request. Special characters might be causing the issue.

4. Firewall or Security Changes: Any updates in your network's security settings or firewall might be interfering with the API requests.

5. Temporary Network Issue: Although telnet might be successful, there could be intermittent issues between your server and the third-party service.

6. Server-Side Changes: Even if the third party claims no changes, there could be alterations or updates on their end causing this discrepancy.