# X_PATH_INVALID

## Means

a path segment is not valid percent-encoding

## Typical cause

a hand-built URL, or a value concatenated into a path instead of run through `encodeURIComponent` — `%ZZ`, a lone `%`, a truncated `%A`. Answers 400: the client wrote the path, so the client is who can fix it, and the request never reaches a handler

## Fix

send the segment percent-encoded — `encodeURIComponent(value)`; a literal `%` is `%25`

[HTTP](/error-codes#http)