.build();

    try (Response response = client.newCall(request).execute()) {
      if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

      Headers responseHeaders = response.headers();
      for (int i = 0; i < responseHeaders.size(); i++) {
        System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
      }

      System.out.println(response.body().string());

    assertThat(request.headers[":scheme"]).isEqualTo(scheme)
    assertThat(request.headers[":authority"]).isEqualTo(
      server.hostName + ":" + server.port,
    )
    val pushedRequest = server.takeRequest()
    assertThat(pushedRequest.requestLine).isEqualTo("GET /foo/bar HTTP/1.1")
    assertThat(pushedRequest.headers["foo"]).isEqualTo("bar")
  }

  @ParameterizedTest

client = TestClient(app)


@pytest.mark.parametrize(
    "path,headers,expected_status,expected_response",
    [
        ("/items", None, 200, {"User-Agent": "testclient"}),
        ("/items", {"X-Header": "notvalid"}, 200, {"User-Agent": "testclient"}),
        ("/items", {"User-Agent": "FastAPI test"}, 200, {"User-Agent": "FastAPI test"}),
    ],
)
def test(path, headers, expected_status, expected_response):

    @Override public Response intercept(Chain chain) throws IOException {
      Request request = chain.request();
      Headers newHeaders = request.headers()
          .newBuilder()
          .add("Date", new Date())
          .build();
      Request newRequest = request.newBuilder()
          .headers(newHeaders)
          .build();
      return chain.proceed(newRequest);
    }
  }

        }
    )


def test_get_invalid_one_header_items():
    response = client.get("/items/", headers={"X-Token": "invalid"})
    assert response.status_code == 400, response.text
    assert response.json() == {"detail": "X-Token header invalid"}


def test_get_invalid_one_users():
    response = client.get("/users/", headers={"X-Token": "invalid"})
    assert response.status_code == 400, response.text

	ctx := context.Background()
	testCases := []struct {
		name            string
		headers         http.Header
		wantObjectAttrs map[string]struct{}
	}{
		{
			name:            "empty header",
			headers:         http.Header{},
			wantObjectAttrs: map[string]struct{}{},
		},
		{
			name: "single header line",
			headers: http.Header{
				xhttp.AmzObjectAttributes: []string{"test1,test2"},
			},

def test_security_http_basic_invalid_credentials():
    response = client.get(
        "/users/me", headers={"Authorization": "Basic notabase64token"}
    )
    assert response.status_code == 401, response.text
    assert response.headers["WWW-Authenticate"] == "Basic"
    assert response.json() == {"detail": "Invalid authentication credentials"}

    return out
  }

  private fun sendHeaderFrames(
    outFinished: Boolean,
    headers: List<Header>,
  ): Buffer {
    val out = Buffer()
    Http2Writer(out, true).headers(outFinished, expectedStreamId, headers)
    return out
  }

  private fun sendPushPromiseFrames(
    streamId: Int,
    headers: List<Header>,
  ): Buffer {
    val out = Buffer()

@needs_py310
@pytest.mark.parametrize(
    "path,headers,expected_status,expected_response",
    [
        ("/items", None, 200, {"X-Token values": None}),
        ("/items", {"x-token": "foo"}, 200, {"X-Token values": ["foo"]}),
        # TODO: fix this, is it a bug?
        # ("/items", [("x-token", "foo"), ("x-token", "bar")], 200, {"X-Token values": ["foo", "bar"]}),
    ],
)

}
```

### Rewriting Responses

Symmetrically, interceptors can rewrite response headers and transform the response body. This is generally more dangerous than rewriting request headers because it may violate the webserver's expectations!