👄 My simple worker for short links

I wanted a quick-and-easy way to create links on my domain, so I turned to Cloudflare Workers.
All routes available, apart from the base redirect, return a JSON response paired with the Content-Type: application/json header.
Every aforementioned JSON response follows this rough schema:

• for successful POST requests:

{
  "success": true,
  "payload": {}
}

• for successful DELETE and PUT requests:

{
  "success": true,
  "message": "Some message."
}

• for any unsuccessful request:

{
  "success": false,
  "message": "Error message."
}

Aside from that, the API also requires authentication through the X-Auth-Key header.

🛣️ The routes

Requests to URLs other than / are handled by the worker and fall under the following spec.

GET /:slug

Runs a check against a bound KV namespace called LINKS, and if a slug like the one requested exists, redirects to the associated URL.
If the slug can't be found, a JSON response is returned.

POST /:slug?url={url}

Creates a case-sensitive entry in the KV namespace called slug with the value url.
Requests to the above endpoint are then redirected to corresponding URLs.
Upon successful creation (not a duplicate, etc.), a JSON response is returned:

{
  "success": true,
  "payload": {
    "slug": "The passed slug",
    "url": "The passed url"
  }
}

POST /new?url={url}

Similar to the above, except, this route randomizes the slug using nanoid.
Since the slug is random, it's very important to save it by reading the response:

{
  "success": true,
  "payload": {
    "slug": "The nanoid-generated slug",
    "url": "The passed url"
  }
}

DELETE /:slug

Deletes a link associated with the slug.

PUT /:slug?url={url}

Update an existing slug with a new url. Doesn't return the new link like POST requests.