res.set(field [, value])

将响应的 HTTP 标头 field 设置为 value。要一次设置多个字段，请将对象作为参数传递。

Sets the response's HTTP header field to value. To set multiple fields at once, pass an object as the parameter.

res.set('Content-Type', 'text/plain')

res.set({
  'Content-Type': 'text/plain',
  'Content-Length': '123',
  ETag: '12345'
})

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