For more specific technical guidance, you can refer to community discussions on: Postman's guide to fixing 415 errors . Stack Overflow solutions for downloading ZIPs via REST . MDN Web Docs for 415 HTTP status codes .
If you are receiving this error while trying to download a zip file via a POST request, it typically means the server does not recognize the format you are sending or the format you expect back. You can resolve this through the following steps:
: If the file is extremely large (e.g., over 1GB), you may also encounter a 413 Payload Too Large error, requiring you to increase the maximum upload/download size in your server settings. Troubleshooting Resources
: For developers using frameworks like Spring Boot or .NET, ensure the controller method is configured to "produce" the correct media type, such as @PostMapping(produces = "application/zip") .