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40 lines
1.5 KiB
Markdown
40 lines
1.5 KiB
Markdown
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# CORS net/http middleware
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[go-chi/cors](https://github.com/go-chi/cors) is a fork of [github.com/rs/cors](https://github.com/rs/cors) that
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provides a `net/http` compatible middleware for performing preflight CORS checks on the server side. These headers
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are required for using the browser native [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API).
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This middleware is designed to be used as a top-level middleware on the [chi](https://github.com/go-chi/chi) router.
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Applying with within a `r.Group()` or using `With()` will not work without routes matching `OPTIONS` added.
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## Usage
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```go
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func main() {
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r := chi.NewRouter()
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// Basic CORS
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// for more ideas, see: https://developer.github.com/v3/#cross-origin-resource-sharing
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r.Use(cors.Handler(cors.Options{
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// AllowedOrigins: []string{"https://foo.com"}, // Use this to allow specific origin hosts
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AllowedOrigins: []string{"*"},
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// AllowOriginFunc: func(r *http.Request, origin string) bool { return true },
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AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
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AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
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ExposedHeaders: []string{"Link"},
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AllowCredentials: false,
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MaxAge: 300, // Maximum value not ignored by any of major browsers
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}))
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r.Get("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("welcome"))
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})
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http.ListenAndServe(":3000", r)
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}
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```
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## Credits
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All credit for the original work of this middleware goes out to [github.com/rs](github.com/rs).
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