Response 的 Writer 扩展

type ExtWriter interface {
	io.Writer
	Flush() error

	// Finalize will be called by framework before the writer is released.
	// Implementations must guarantee that Finalize is safe for multiple calls.
	Finalize() error
}

	h.GET("/hijack", func(c context.Context, ctx *app.RequestContext) {
		// Hijack the writer of response
		ctx.Response.HijackWriter(yourResponseWriter)
	})

	h.GET("/flush/chunk", func(c context.Context, ctx *app.RequestContext) {
		// Hijack the writer of response
		ctx.Response.HijackWriter(resp.NewChunkedBodyWriter(&ctx.Response, ctx.GetWriter()))

		for i := 0; i < 10; i++ {
			ctx.Write([]byte(fmt.Sprintf("chunk %d: %s", i, strings.Repeat("hi~", i)))) // nolint: errcheck
			ctx.Flush()                                                                 // nolint: errcheck
			time.Sleep(200 * time.Millisecond)
		}
	})