void setCorsMaxAge(ResponseHeadersBuilder headers) {
        headers.setLong(HttpHeaderNames.ACCESS_CONTROL_MAX_AGE, maxAge);
    }
Determines whether all request headers are allowed.

@return true if all request headers are allowed,
        false if only specific request headers are allowed.
core/src/main/java/com/linecorp/armeria/server/cors/CorsPolicy.java