Error response in Django

A client wants to upload a file with the curl command, and I need to validate its data.

What kind of response should I give to indicate that the file is corrupted, so that the client can use the exit 开发者_C百科code of curl to figure out whether or not it succeeded?

(i.e. I don't want to make him parse HTML.)

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HTTP code 400 is Bad Request, which is probably the best bet here.

No reason for HTML, though. The response can be simply plain text, or something like JSON.