mtfosbot/vendor/github.com/gin-contrib/cors/README.md

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2018-08-14 09:25:34 +00:00
# CORS gin's middleware
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Gin middleware/handler to enable CORS support.
## Usage
### Start using it
Download and install it:
```sh
$ go get gopkg.in/gin-contrib/cors.v1
```
Import it in your code:
```go
import "gopkg.in/gin-contrib/cors.v1"
```
### Canonical example:
```go
package main
import (
"time"
"gopkg.in/gin-contrib/cors.v1"
"github.com/gin-gonic/gin"
)
func main() {
router := gin.Default()
// CORS for https://foo.com and https://github.com origins, allowing:
// - PUT and PATCH methods
// - Origin header
// - Credentials share
// - Preflight requests cached for 12 hours
router.Use(cors.New(cors.Config{
AllowOrigins: []string{"https://foo.com"},
AllowMethods: []string{"PUT", "PATCH"},
AllowHeaders: []string{"Origin"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
AllowOriginFunc: func(origin string) bool {
return origin == "https://github.com"
},
MaxAge: 12 * time.Hour,
}))
router.Run()
}
```
### Using DefaultConfig as start point
```go
func main() {
router := gin.Default()
// - No origin allowed by default
// - GET,POST, PUT, HEAD methods
// - Credentials share disabled
// - Preflight requests cached for 12 hours
config := cors.DefaultConfig()
config.AllowOrigins = []string{"http://google.com"}
config.AddAllowOrigins("http://facebook.com")
// config.AllowOrigins == []string{"http://google.com", "http://facebook.com"}
router.Use(cors.New(config))
router.Run()
}
```
### Default() allows all origins
```go
func main() {
router := gin.Default()
// same as
// config := cors.DefaultConfig()
// config.AllowAllOrigins = true
// router.Use(cors.New(config))
router.Use(cors.Default())
router.Run()
}
```