assertThat(graph.edgeValueOrDefault(1, 2, null)).isEqualTo("valueA");
    assertThat(graph.edgeValueOrDefault(2, 1, null)).isEqualTo("valueB");
    assertThat(graph.edgeValue(1, 2).get()).isEqualTo("valueA");
    assertThat(graph.edgeValue(2, 1).get()).isEqualTo("valueB");

    graph.removeEdge(1, 2);
    graph.putEdgeValue(2, 1, "valueC");
    assertThat(graph.edgeValueOrDefault(1, 2, DEFAULT)).isEqualTo(DEFAULT);

        slowPointer = slowPointer.getCause();
      }
      advanceSlowPointer = !advanceSlowPointer; // only advance every other iteration
    }
    return throwable;
  }

  /**
   * Gets a {@code Throwable} cause chain as a list. The first entry in the list will be {@code
   * throwable} followed by its cause hierarchy. Note that this is a snapshot of the cause chain and

passage, not much larger than a rat-hole:  she knelt down and
looked along the passage into the loveliest garden you ever saw.
How she longed to get out of that dark hall, and wander about
among those beds of bright flowers and those cool fountains, but
she could not even get her head though the doorway; `and even if
my head would go through,' thought poor Alice, `it would be of
very little use without my shoulders.  Oh, how I wish

    public ScriptEngine getScriptEngine(final String name) {
        if (name == null) {
            throw new ScriptEngineException("script name is null.");
        }
        final ScriptEngine scriptEngine = scriptEngineMap.get(name.toLowerCase(Locale.ROOT));
        if (scriptEngine != null) {
            return scriptEngine;
        }
        throw new ScriptEngineException(name + " is not found.");
    }

- Favour a working external library if appropriate.  There are many examples of OkHttp libraries that can sit on top or hook in via existing APIs.
- Get working code on a personal branch with tests before you submit a PR.
- OkHttp is a small and light dependency.  Don't introduce new dependencies or major new functionality.

        <details>

        ```console
        # On Linux:
        $ cat /etc/os-release
        # paste output here
        $ uname -a
        # paste output here

        # On Windows:
        C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
        # paste output here
        ```

        </details>

  - type: textarea
    id: installer
    attributes:
      label: Install tools
      value: |

/**
 * OkHttp.
 *
 * https://square.github.io/okhttp/
 */
class OkHttpClientTest {
  @JvmField @RegisterExtension
  val platform = PlatformRule()

  @Test fun get(server: MockWebServer) {
    server.enqueue(MockResponse(body = "hello, OkHttp"))

    val client = OkHttpClient()

    val request =
      Request.Builder()
        .url(server.url("/"))

    super(new OutputStreamWriter(checkNotNull(out), UTF_8));
    this.out = out;
  }

  @Override
  public void write(int c) throws IOException {
    super.write(c);
    flush(); // flush write to TestOutputStream to get its behavior
  }

  @Override
  public void write(char[] cbuf, int off, int len) throws IOException {
    super.write(cbuf, off, len);
    flush();
  }

  @Override

     */
    public static DecimalFormatSymbols getDecimalFormatSymbols(final Locale locale) {
        assertArgumentNotNull("locale", locale);

        DecimalFormatSymbols symbols = CACHE.get(locale);
        if (symbols == null) {
            symbols = new DecimalFormatSymbols(locale);
            CACHE.put(locale, symbols);
        }
        return symbols;
    }

        "detail": [
            {"loc": ["tags", 3], "msg": "str type expected", "type": "type_error.str"}
        ]
    }


@needs_pydanticv1
def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {