public SELF allowRequestMethods(HttpMethod... methods) {
        requireNonNull(methods, "methods");
        return allowRequestMethods(ImmutableList.copyOf(methods));
    }
Specifies the allowed set of HTTP request methods that should be returned in the
CORS {@code "Access-Control-Allow-Methods"} response header.

@param methods the {@link HttpMethod}s that should be allowed.
@return {@code this} to support method chaining.
core/src/main/java/com/linecorp/armeria/server/cors/AbstractCorsPolicyBuilder.java