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