code: def from_url(cls, url, **kwargs):
          
          doc = {
              "clusters": [
                  {
                      "name": "self",
                      "cluster": {
                          "server": url,
                      },
                  },
              ],
              "contexts": [
                  {
                      "name": "self",
                      "context": {
                          "cluster": "self",
                      },
                  }
              ],
              "current-context": "self",
          }
          self = cls(doc, **kwargs)
          return self
docs: Creates an instance of the KubeConfig class from a single URL (useful
          for interacting with kubectl proxy).