phoenix/views/middleware/security.go

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package middleware
import (
"net/http"
)
// Adds several headers to the response to improve security.
// For example, headers prevent embedding a site and passing information about the referrer.
func SecurityHeadersMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-Frame-Options", "SAMEORIGIN")
w.Header().Set("X-Content-Type-Options", "nosniff")
w.Header().Set("Referrer-Policy", "same-origin")
w.Header().Set("Content-Security-Policy", "script-src 'self'; ")
next.ServeHTTP(w, r)
})
}