public ResteasyServiceBuilder<T> path(String contextPath) {
        this.contextPath = requireNonNull(contextPath, "contextPath");
        if (contextPath.isEmpty()) {
            this.contextPath = "/";
        } else if (!contextPath.startsWith("/")) {
            this.contextPath = '/' + contextPath;
        } else {
            this.contextPath = contextPath;
        }
        return this;
    }
Sets the context path for {@link ResteasyService}.
resteasy/src/main/java/com/linecorp/armeria/server/resteasy/ResteasyServiceBuilder.java