@Override
    public String toString() {
        // racy single-check idiom, safe because String is immutable
        String result = toString;
        if (result == null) {
            result = computeToString();
            toString = result;
        }
        return result;
    }
Returns the string representation of this media type in the format described in <a
href="https://datatracker.ietf.org/doc/rfc2045/">RFC 2045</a>.
core/src/main/java/com/linecorp/armeria/common/MediaType.java