Middlewares

Middlewares are functions that execute sequentially before the handler or validator if presented.

(ctx) => {
    // Do something with the context
}

If a middleware returns a Response object, the object is returned as a response directly. To skip checking this you can use app.prepare with the same arguments instead of app.use.

If a middleware returns a Promise it should be an async function for the compiler to detect and inline the validator call.

To register middlewares for all handlers of a Byte instance:

// Register one middleware
app.use((ctx) => {
    if (ctx.req.headers.get('Origin') !== 'https://example.com') {
        ctx.status = 403;
        return ctx.body('Rejected');
    }
});

// Handler will run after middleware
app.get('/middlewares', (ctx) => ctx.body('Hi'));