code: func (c *ServerGetBotConfigCall) IfNoneMatch(entityTag string) *ServerGetBotConfigCall {
  	c.ifNoneMatch_ = entityTag
  	return c
  }
docs: // IfNoneMatch sets the optional parameter which makes the operation
  // fail if the object's ETag matches the given value. This is useful for
  // getting updates only after the object has changed since the last
  // request. Use googleapi.IsNotModified to check whether the response
  // error from Do is the result of In-None-Match.