middleware

type CorsConfig struct {
	AllowAllOrigins bool

	// AllowOrigins is a list of origins a cross-domain request can be executed from.
	// If the special "*" value is present in the list, all origins will be allowed.
	// Default value is []
	AllowOrigins []string

	// AllowOriginFunc is a custom function to validate the origin. It takes the origin
	// as an argument and returns true if allowed or false otherwise. If this option is
	// set, the content of AllowOrigins is ignored.
	AllowOriginFunc func(origin string) bool

	// AllowMethods is a list of methods the client is allowed to use with
	// cross-domain requests. Default value is simple methods (GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS)
	AllowMethods []string

	// AllowPrivateNetwork indicates whether the response should include allow private network header
	AllowPrivateNetwork bool

	// AllowHeaders is list of non simple headers the client is allowed to use with
	// cross-domain requests.
	AllowHeaders []string

	// AllowCredentials indicates whether the request can include user credentials like
	// cookies, HTTP authentication or client side SSL certificates.
	AllowCredentials bool

	// ExposeHeaders indicates which headers are safe to expose to the API of a CORS
	// API specification
	ExposeHeaders []string

	// MaxAge indicates how long (with second-precision) the results of a preflight request
	// can be cached
	MaxAge time.Duration

	// Allows to add origins like http://some-domain/*, https://api.* or http://some.*.subdomain.com
	AllowWildcard bool

	// Allows usage of popular browser extensions schemas
	AllowBrowserExtensions bool

	// Allows usage of WebSocket protocol
	AllowWebSockets bool

	// Allows usage of file:// schema (dangerous!) use it only when you 100% sure it's needed
	AllowFiles bool

	// Allows to pass custom OPTIONS response status code for old browsers / clients
	OptionsResponseStatusCode int
}