middleware/common_headers.go


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// Copyright 2018 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

package middleware

import (
	"net/http"
)

// CommonHeaders sends common HTTP headers.
func (m *Middleware) CommonHeaders(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("X-XSS-Protection", "1; mode=block")
		w.Header().Set("X-Content-Type-Options", "nosniff")
		w.Header().Set("X-Frame-Options", "DENY")
		w.Header().Set("Content-Security-Policy", "default-src 'self'; img-src *; media-src *; frame-src *; child-src *")

		if m.cfg.IsHTTPS && m.cfg.HasHSTS() {
			w.Header().Set("Strict-Transport-Security", "max-age=31536000")
		}

		next.ServeHTTP(w, r)
	})
}