Append body would corrupt the file

HTTP 400 · invalid-append-body — ← all Webpath errors

The body is not valid for a line-oriented file (bad JSON line, unterminated field, or non-UTF-8).

How to recover. Fix the body so every line is valid, then retry. Nothing was written.

Example response

{
  "type": "https://muse.as/a/webpath/errors/invalid-append-body",
  "title": "Append body would corrupt the file",
  "status": 400,
  "detail": "Fix the body so every line is valid, then retry. Nothing was written."
}

This page documents the invalid-append-body error type returned in Webpath RFC 7807 application/problem+json responses. The machine-readable detail field carries a recovery hint you can show a user verbatim — see the Spec §12 and API Reference.