public RoutingResultBuilder rawParam(String name, String value) {
        pathParams().put(requireNonNull(name, "name"),
                         ArmeriaHttpUtil.decodePathParam(requireNonNull(value, "value")));
        return this;
    }
Adds an encoded path parameter, which will be decoded in UTF-8 automatically.
core/src/main/java/com/linecorp/armeria/server/RoutingResultBuilder.java