static HttpData ofUtf8(CharSequence text) {
        return of(StandardCharsets.UTF_8, text);
    }
Converts the specified {@code text} into a UTF-8 {@link HttpData}.

@param text the {@link String} to convert

@return a new {@link HttpData}. {@link #empty()} if the length of {@code text} is 0.
core/src/main/java/com/linecorp/armeria/common/HttpData.java