Middleware

Middleware can be added to DinoSsr by attaching VelociRouter handles to the internal router after initiating the server.

Before

router.use will attach the handle before any auto-generated routes.

dinossr.router.use(({request, response}) => {
  const pattern = new URLPattern('/api/:id/', request.url);
  const match = pattern.exec(request.url);
  if (match && request.method === 'GET') {
    return Response.json({id: match.pathname.groups.id});
  }
});

All requests will pass through a use handle.

After

Other methods like router.get require a pattern. These handles are attached after all auto-generated routes.

dinossr.router.get('/api/*', ({response}) => {
  try {
    response.headers.set('x-api-version', '1.0');
  } catch { /* No response or immutable headers */ }
});

See the VelociRouter documentation for usage.

Middleware is ideal for:

• Setting up the context data objects
• Handling API endpoints and POST requests
• Anything that requires large 3rd party libraries ^†

^† middleware is never bundled.