The server cannot find the requested resource. The URL may be wrong, the resource may have been deleted, or the route doesn't exist.
// Next.js redirects in next.config.ts
const nextConfig = {
async redirects() {
return [{
source: '/old-path',
destination: '/new-path',
permanent: true,
}];
},
};Set up 301 redirects for moved URLs to preserve SEO value.
ObserveOne monitors your routes and alerts when new 404 errors appear, preventing broken user experiences.
Start Monitoring FreeThe server cannot process the request due to malformed syntax, invalid parameters, or bad encoding.
The resource existed but has been permanently removed. Unlike 404, this explicitly tells clients the resource won't come back.
The request requires authentication. The client must provide valid credentials.
The server understood the request but refuses to authorize it. Authentication won't help — the user lacks permissions.
The HTTP method (GET, POST, PUT, DELETE) is not supported for this endpoint.