README.md

Go CORS handler

CORS is a net/http handler implementing Cross Origin Resource Sharing W3 specification (http://www.w3.org/TR/cors/) in Golang.

Getting Started

After installing Go and setting up your GOPATH, create your first .go file. We'll call it server.go.

package main

import (
    "github.com/rs/cors"
    "net/http"
)

func main() {
    c := cors.New(cors.Options{
        AllowedOrigins: []string{"foo.com"},
    })

    h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Content-Type", "application/json")
        w.Write([]byte("{\"hello\": \"world\"}"))
    })

    mux := http.NewServeMux()
    mux.Handle("/", c.Handler(h))
    http.ListenAndServe(":8080", mux)
}

Install cors:

go get github.com/rs/cors

Then run your server:

go run server.go

The server now runs on localhost:8080:

$ curl -D - -H 'Origin: foo.com' http://localhost:8080/
HTTP/1.1 200 OK
Access-Control-Allow-Origin: foo.com
Content-Type: application/json
Date: Sat, 25 Oct 2014 03:43:57 GMT
Content-Length: 18

{"hello": "world"}

or:

$ curl -D - -H 'Origin: bar.com' http://localhost:8080/
HTTP/1.1 200 OK
Content-Type: application/json
Date: Sat, 25 Oct 2014 03:44:25 GMT
Content-Length: 18

{"hello": "world"}

See API documentation for more info.

Licenses

All source code is licensed under the MIT License.