func addCustomHeadersMiddleware(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		header := w.Header()
		header.Set("X-XSS-Protection", "1; mode=block")                                // Prevents against XSS attacks
		header.Set("X-Content-Type-Options", "nosniff")                                // Prevent mime-sniff

# Inline MIME types for the response.
response.inline.mimetypes=application/pdf,text/plain
# HTTP headers for the response.
response.headers=\
text/html=X-XSS-Protection: 1; mode=block\n\
text/html=Content-Security-Policy: reflected-xss block\n\
text/html=X-Frame-Options: SAMEORIGIN\n\


# document index

# Index name for search documents.
index.document.search.index=fess.search

    String RESPONSE_INLINE_MIMETYPES = "response.inline.mimetypes";

    /** The key of the configuration. e.g. text/html=X-XSS-Protection: 1; mode=block<br>
     * text/html=Content-Security-Policy: reflected-xss block<br>
     * text/html=X-Frame-Options: SAMEORIGIN<br>
     *  */
    String RESPONSE_HEADERS = "response.headers";