Overview

What you're asking for can't be processed.

Takeaways

Note

The client should not repeat this request without modification.

  1. The server understands the content type of the request entity (hence a 415 Unsupported Media Type status code is inappropriate).
  2. The syntax of the request entity is correct (thus a 400 Bad Request status code is inappropriate).
  3. But the server was unable to process the contained instructions.

For example, this error condition may occur if an XML request body contains well-formed (i.e., syntactically correct), but semantically erroneous, XML instructions.

Related

400 Bad Request

That request won't be processed, you need to adjust the request.

415 Unsupported Media Type

Your payload format isn't supported.

Further Reading

Specification

422 Unprocessable Entity | The HTTP Working Group

422 Unprocessable Entity

MDN web docs