http2-server-push
HTTP/2 Server Push
原文：https://echo.labstack.com/docs/cookbook/http2-server-push
NOTE
Requires go1.8+
Send web assets using HTTP/2 server push
1) Register a route to serve web assets
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| e.Static("/", "static")
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2) Create a handler to serve index.html and push it’s dependencies
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| e.GET("/", func(c echo.Context) (err error) {
pusher, ok := c.Response().Writer.(http.Pusher)
if ok {
if err = pusher.Push("/app.css", nil); err != nil {
return
}
if err = pusher.Push("/app.js", nil); err != nil {
return
}
if err = pusher.Push("/echo.png", nil); err != nil {
return
}
}
return c.File("index.html")
})
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INFO
If http.Pusher is supported, web assets are pushed; otherwise, client makes separate requests to get them.
3) Start TLS server using cert.pem and key.pem
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| if err := e.StartTLS(":1323", "cert.pem", "key.pem"); err != http.ErrServerClosed {
log.Fatal(err)
}
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or use customized HTTP server with your own TLSConfig
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| s := http.Server{
Addr: ":8443",
Handler: e, // set Echo as handler
TLSConfig: &tls.Config{
//Certificates: nil, // <-- s.ListenAndServeTLS will populate this field
},
//ReadTimeout: 30 * time.Second, // use custom timeouts
}
if err := s.ListenAndServeTLS("cert.pem", "key.pem"); err != http.ErrServerClosed {
log.Fatal(err)
}
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4) Start the server and browse to https://localhost:1323
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| Protocol: HTTP/2.0
Host: localhost:1323
Remote Address: [::1]:60288
Method: GET
Path: /
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Source Code
cookbook/http2-server-push/index.html
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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>HTTP/2 Server Push</title>
<link rel="stylesheet" href="/app.css">
<script src="/app.js"></script>
</head>
<body>
<img class="echo" src="/echo.png">
<h2>The following static files are served via HTTP/2 server push</h2>
<ul>
<li><code>/app.css</code></li>
<li><code>/app.js</code></li>
<li><code>/echo.png</code></li>
</ul>
</body>
</html>
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cookbook/http2-server-push/server.go
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| package main
import (
"net/http"
"github.com/labstack/echo/v4"
)
func main() {
e := echo.New()
e.Static("/", "static")
e.GET("/", func(c echo.Context) (err error) {
pusher, ok := c.Response().Writer.(http.Pusher)
if ok {
if err = pusher.Push("/app.css", nil); err != nil {
return
}
if err = pusher.Push("/app.js", nil); err != nil {
return
}
if err = pusher.Push("/echo.png", nil); err != nil {
return
}
}
return c.File("index.html")
})
e.Logger.Fatal(e.StartTLS(":1323", "cert.pem", "key.pem"))
}
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