HTTP status codes / 4xx — Client error
413 Content Too Large
What it means
The request body exceeds what the server accepts — the classic upload-size rejection.
What causes it
File upload over the limit; nginx client_max_body_size (default 1MB) is the most common culprit behind unexpected 413s.
How to fix it
Shrink or chunk the upload. Server-side: raise client_max_body_size (nginx) or the framework's body-parser limit — every layer (CDN, proxy, app) has its own cap and the smallest one wins.