public CorsServiceBuilder maxAge(long maxAge) {
        firstPolicyBuilder.maxAge(maxAge);
        return this;
    }
Sets the CORS {@code "Access-Control-Max-Age"} response header and enables the
caching of the preflight response for the specified time. During this time no preflight
request will be made.

@param maxAge the maximum time, in seconds, that the preflight response may be cached.
@return {@link CorsServiceBuilder} to support method chaining.
core/src/main/java/com/linecorp/armeria/server/cors/CorsServiceBuilder.java