@Override
    @FormatMethod
    public HttpResponseBuilder content(@FormatString String format, Object... content) {
        return (HttpResponseBuilder) super.content(format, content);
    }
Sets the content as UTF-8 for this response. The {@code content} is formatted by
{@link String#format(Locale, String, Object...)} with {@linkplain Locale#ENGLISH English locale}.
core/src/main/java/com/linecorp/armeria/common/HttpResponseBuilder.java