code: func (c *Ctx) Get(key interface{}) (value interface{}, exists bool) {
  	value = c.netContext.Value(key)
  	exists = value != nil
  	return
  }
docs: // Get returns the value for the given key and is a shortcut
  // for the golang.org/x/net/context context.Value(...) ... but it
  // also returns if the value was found or not.