59 lines
1.7 KiB
Markdown
59 lines
1.7 KiB
Markdown
# Server-Sent Events
|
|
|
|
[](https://godoc.org/github.com/gin-contrib/sse)
|
|
[](https://travis-ci.org/gin-contrib/sse)
|
|
[](https://codecov.io/gh/gin-contrib/sse)
|
|
[](https://goreportcard.com/report/github.com/gin-contrib/sse)
|
|
|
|
Server-sent events (SSE) is a technology where a browser receives automatic updates from a server via HTTP connection. The Server-Sent Events EventSource API is [standardized as part of HTML5[1] by the W3C](http://www.w3.org/TR/2009/WD-eventsource-20091029/).
|
|
|
|
- [Read this great SSE introduction by the HTML5Rocks guys](http://www.html5rocks.com/en/tutorials/eventsource/basics/)
|
|
- [Browser support](http://caniuse.com/#feat=eventsource)
|
|
|
|
## Sample code
|
|
|
|
```go
|
|
import "github.com/gin-contrib/sse"
|
|
|
|
func httpHandler(w http.ResponseWriter, req *http.Request) {
|
|
// data can be a primitive like a string, an integer or a float
|
|
sse.Encode(w, sse.Event{
|
|
Event: "message",
|
|
Data: "some data\nmore data",
|
|
})
|
|
|
|
// also a complex type, like a map, a struct or a slice
|
|
sse.Encode(w, sse.Event{
|
|
Id: "124",
|
|
Event: "message",
|
|
Data: map[string]interface{}{
|
|
"user": "manu",
|
|
"date": time.Now().Unix(),
|
|
"content": "hi!",
|
|
},
|
|
})
|
|
}
|
|
```
|
|
```
|
|
event: message
|
|
data: some data\\nmore data
|
|
|
|
id: 124
|
|
event: message
|
|
data: {"content":"hi!","date":1431540810,"user":"manu"}
|
|
|
|
```
|
|
|
|
## Content-Type
|
|
|
|
```go
|
|
fmt.Println(sse.ContentType)
|
|
```
|
|
```
|
|
text/event-stream
|
|
```
|
|
|
|
## Decoding support
|
|
|
|
There is a client-side implementation of SSE coming soon.
|