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Add Pusher() function for support http2 server push (#1273)

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gin already support http2, while previously not support server push.
Add Pusher() function to extend the ResponseWriter interface.

```golang
// get http.Pusher
 if pusher := c.Writer.Pusher(); pusher != nil {
     // use pusher.Push() to do server push
}
```
<img width="881" alt="screen shot 2018-03-07 at 11 20 49 pm" src="https://user-images.githubusercontent.com/16014993/37100619-680c00c6-225e-11e8-9352-76ec3bd62894.png">
This commit is contained in:
htobenothing
2018-06-21 09:53:52 +08:00
committed by Bo-Yi Wu
parent 87d536c001
commit bf85b32c1d
9 changed files with 177 additions and 1 deletions
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50
README.md
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@ -54,6 +54,7 @@ Gin is a web framework written in Go (Golang). It features a martini-like API wi
- [Build a single binary with templates](#build-a-single-binary-with-templates)
- [Bind form-data request with custom struct](#bind-form-data-request-with-custom-struct)
- [Try to bind body into different structs](#try-to-bind-body-into-different-structs)
- [http2 server push](#http2-server-push)
- [Testing](#testing)
- [Users](#users--)
@ -1656,6 +1657,55 @@ enough to call binding at once.
can be called by `c.ShouldBind()` multiple times without any damage to
performance (See [#1341](https://github.com/gin-gonic/gin/pull/1341)).
### http2 server push
http.Pusher is supported only **go1.8+**. See the [golang blog](https://blog.golang.org/h2push) for detail information.
[embedmd]:# (examples/http-pusher/main.go go)
```go
package main
import (
"html/template"
"log"
"github.com/gin-gonic/gin"
)
var html = template.Must(template.New("https").Parse(`
<html>
<head>
<title>Https Test</title>
<script src="/assets/app.js"></script>
</head>
<body>
<h1 style="color:red;">Welcome, Ginner!</h1>
</body>
</html>
`))
func main() {
r := gin.Default()
r.Static("/assets", "./assets")
r.SetHTMLTemplate(html)
r.GET("/", func(c *gin.Context) {
if pusher := c.Writer.Pusher(); pusher != nil {
// use pusher.Push() to do server push
if err := pusher.Push("/assets/app.js", nil); err != nil {
log.Printf("Failed to push: %v", err)
}
}
c.HTML(200, "https", gin.H{
"status": "success",
})
})
// Listen and Server in https://127.0.0.1:8080
r.RunTLS(":8080", "./testdata/server.pem", "./testdata/server.key")
}
```
## Testing
The `net/http/httptest` package is preferable way for HTTP testing.