路由

Hono 的路由灵活且直观。 下面来看一下。

基本用法

// HTTP Methods
app.get('/', (c) => c.text('GET /'))
app.post('/', (c) => c.text('POST /'))
app.put('/', (c) => c.text('PUT /'))
app.delete('/', (c) => c.text('DELETE /'))
app.query('/', (c) => c.text('QUERY /'))

// Wildcard
app.get('/wild/*/card', (c) => {
  return c.text('GET /wild/*/card')
})

// Any HTTP methods
app.all('/hello', (c) => c.text('Any Method /hello'))

// Custom HTTP method
app.on('PURGE', '/cache', (c) => c.text('PURGE Method /cache'))

// Multiple Method
app.on(['PUT', 'DELETE'], '/post', (c) =>
  c.text('PUT or DELETE /post')
)

// Multiple Paths
app.on('GET', ['/hello', '/ja/hello', '/en/hello'], (c) =>
  c.text('Hello')
)

路径参数

app.get('/user/:name', async (c) => {
  const name = c.req.param('name')
  // ...
})

也可以一次获取所有参数：

app.get('/posts/:id/comment/:comment_id', async (c) => {
  const { id, comment_id } = c.req.param()
  // ...
})

可选参数

// Will match `/api/animal` and `/api/animal/:type`
app.get('/api/animal/:type?', (c) => c.text('Animal!'))

正则表达式

app.get('/post/:date{[0-9]+}/:title{[a-z]+}', async (c) => {
  const { date, title } = c.req.param()
  // ...
})

包含斜杠

app.get('/posts/:filename{.+\\.png}', async (c) => {
  //...
})

链式路由

app
  .get('/endpoint', (c) => {
    return c.text('GET /endpoint')
  })
  .post((c) => {
    return c.text('POST /endpoint')
  })
  .delete((c) => {
    return c.text('DELETE /endpoint')
  })

路由分组

可以使用 Hono 实例对路由进行分组，再通过 route 方法添加到主应用中。

const book = new Hono()

book.get('/', (c) => c.text('List Books')) // GET /book
book.get('/:id', (c) => {
  // GET /book/:id
  const id = c.req.param('id')
  return c.text('Get Book: ' + id)
})
book.post('/', (c) => c.text('Create Book')) // POST /book

const app = new Hono()
app.route('/book', book)

保留基础路径的分组

也可以在保留基础路径的同时对多个实例进行分组。

const book = new Hono()
book.get('/book', (c) => c.text('List Books')) // GET /book
book.post('/book', (c) => c.text('Create Book')) // POST /book

const user = new Hono().basePath('/user')
user.get('/', (c) => c.text('List Users')) // GET /user
user.post('/', (c) => c.text('Create User')) // POST /user

const app = new Hono()
app.route('/', book) // Handle /book
app.route('/', user) // Handle /user

基础路径

可以指定基础路径。

const api = new Hono().basePath('/api')
api.get('/book', (c) => c.text('List Books')) // GET /api/book

根据主机名路由

路由中包含主机名也可以正常工作。

const app = new Hono({
  getPath: (req) => req.url.replace(/^https?:\/([^?]+).*$/, '$1'),
})

app.get('/www1.example.com/hello', (c) => c.text('hello www1'))
app.get('/www2.example.com/hello', (c) => c.text('hello www2'))

根据 host 请求头的值路由

在 Hono 构造函数中设置 getPath() 函数后，就可以根据 host 请求头的值进行路由。

const app = new Hono({
  getPath: (req) =>
    '/' +
    req.headers.get('host') +
    req.url.replace(/^https?:\/\/[^/]+(\/[^?]*).*/, '$1'),
})

app.get('/www1.example.com/hello', (c) => c.text('hello www1'))

// A following request will match the route:
// new Request('http://www1.example.com/hello', {
//  headers: { host: 'www1.example.com' },
// })

运用这种方式，例如可以根据 User-Agent 请求头来改变路由。

路由优先级

处理程序和中间件按照注册顺序执行。

app.get('/book/a', (c) => c.text('a')) // a
app.get('/book/:slug', (c) => c.text('common')) // common

GET /book/a ---> `a`
GET /book/b ---> `common`

处理程序执行后，处理流程就会停止。

app.get('*', (c) => c.text('common')) // common
app.get('/foo', (c) => c.text('foo')) // foo

GET /foo ---> `common` // foo will not be dispatched

如果有需要执行的中间件，请将它的代码放在处理程序之前。

app.use(logger())
app.get('/foo', (c) => c.text('foo'))

如果需要“兜底”处理程序，请将它的代码放在其他处理程序之后。

app.get('/bar', (c) => c.text('bar')) // bar
app.get('*', (c) => c.text('fallback')) // fallback

GET /bar ---> `bar`
GET /foo ---> `fallback`

分组顺序

请注意，路由分组的顺序错误很难发现。 route() 函数会取出第二个参数（例如 three 或 two）中已注册的路由，并将其添加到自身（two 或 app）的路由中。

three.get('/hi', (c) => c.text('hi'))
two.route('/three', three)
app.route('/two', two)

export default app

这将返回状态码为 200 的响应。

GET /two/three/hi ---> `hi`

但是，如果顺序不正确，就会返回 404。

three.get('/hi', (c) => c.text('hi'))
app.route('/two', two) // `two` does not have routes
two.route('/three', three)

export default app

GET /two/three/hi ---> 404 Not Found