docs: public void releaseEip(ReleaseEipRequest request) {
          checkStringNotEmpty(request.getEip(), "eip should not be empty");
          if (Strings.isNullOrEmpty(request.getClientToken())) {
              request.setClientToken(generateDefaultClientToken());
          }
          InternalRequest internalRequest = this.createRequest(request, HttpMethodName.DELETE, request.getEip());
          internalRequest.addParameter(CLIENT_TOKEN_IDENTIFY, request.getClientToken());
          invokeHttpClient(internalRequest, AbstractBceResponse.class);
      }