413 Content Too Large

The request body is larger than the server will accept. Formerly Payload Too Large.

What to do

The body is larger than the server accepts. Send less, or raise the limit. In nginx the limit is client_max_body_size, 1 MB by default.

Class
4xx Client Error. The request has a fault, or cannot be met as sent.
Registered
Yes, in the IANA HTTP status code registry.
Cacheable by default
No. A cache stores it only when Cache-Control or Expires says to.
References
RFC 9110 ยง15.5.14 · MDN

Every 4xx code

All HTTP status codes, in one table