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413 Content Too Large

The body is over the limit. Say what the limit is in the response.

413Client error
What it means
The body is over the limit. Say what the limit is in the response.
In practice
An upload exceeded a size cap — and the cap is very often in the proxy, not the app: nginx’s client_max_body_size defaults to 1 MB and produces 413s the application never sees. If your API accepts a file in code but 413s in production, check the reverse proxy first.
Whose problem is it?
The request. Retrying it unchanged will get the same answer.