---
title: "Preflight Negative Test"
method: POST
path: "/admin/diagnostics/preflight-negative-test"
---

# Preflight Negative Test

`POST /admin/diagnostics/preflight-negative-test`

## Request

- Base URL: `https://api.colourmemory.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.colourmemory.com/admin/diagnostics/preflight-negative-test`
- Auth: none declared

Deterministically triggers a REAL bounds-check failure through the
actual production renderer (a 60-character unbroken title, which
Session 2A-i.1's regression suite confirmed reliably exceeds the
page width since titles are character-sliced, not width-checked) --
not a mocked response, not a manifest-mutation shortcut. Confirms the
full pipeline (render -> preflight -> fail closed) behaves exactly
like the public path would on equivalently bad input, and that
_deliver_pdf (and therefore the R2 upload it performs) is never
reached: the early return on a failed preflight is structural, not
conditional, so no upload is attempted here by construction.

## Headers

- `x-admin-key` string, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/colourmemory/apis/colour-memory-api.md) · [All operations](https://skmtc.dev/colourmemory/apis/colour-memory-api/llms.txt) · [OpenAPI document](https://skmtc.dev/colourmemory/apis/colour-memory-api/revisions/4ba028f64042?raw)