HTTP status codes / 4xx — Client errors
414 URI Too Long
The URL itself exceeds server limits.
What it means
Usually the result of stuffing data into query strings (filters, ID lists, redirect loops appending parameters). Limits are commonly around 4-8KB at proxies and servers.
Common causes
- Filters/ID lists stuffed into the query string
- Redirect loop appending parameters each round
- Signed URLs with enormous tokens
How to debug it
Move the data into a POST body, or check for a redirect loop that keeps growing the query string.
Server-side note: Move data into a POST body, or break the redirect loop. Proxy limits sit around 4-8KB.
The fastest way to pin down a 414 is to reproduce the exact request and inspect what actually went over the wire — status, headers, timing and body, without your app code in the way. That is what an API client is for; ReqPad does it from your phone, with every request saved to history.
Related codes
400 Bad Request · 401 Unauthorized · 402 Payment Required · 403 Forbidden · 404 Not Found · 405 Method Not Allowed — or the full reference.
Reproduce that 414 in 10 seconds.
Build the request, send it, read status + headers + timing — on your iPhone. Free to start.