apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/client/url/OpenApiPathBuilder.java/OpenApiPathBuilder/namespacesPathVal
class OpenApiPathBuilder:  public OpenApiPathBuilder namespacesPathVal(String namespaces) {
    pathVariable.put(NAMESPACES_PATH, escapePath(namespaces));
    return this;
  }