<img src="/img/tutorial/path-operation-configuration/image02.png">

## Response description { #response-description }

You can specify the response description with the parameter `response_description`:

{* ../../docs_src/path_operation_configuration/tutorial005_py310.py hl[19] *}

/// info

Notice that `response_description` refers specifically to the response, the `description` refers to the *path operation* in general.

///

    client = TestClient(mod.app, cookies=cookies)
    response = client.get(path)
    assert response.status_code == expected_status
    assert response.json() == expected_response


def test_openapi_schema(mod: ModuleType):
    client = TestClient(mod.app)
    response = client.get("/openapi.json")
    assert response.status_code == 200
    assert response.json() == {
        "openapi": "3.1.0",

def test(path, headers, expected_status, expected_response, client: TestClient):
    response = client.get(path, headers=headers)
    assert response.status_code == expected_status
    assert response.json() == expected_response


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200
    assert response.json() == {
        "openapi": "3.1.0",

def test(path, headers, expected_status, expected_response, client: TestClient):
    response = client.get(path, headers=headers)
    assert response.status_code == expected_status
    assert response.json() == expected_response


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200
    assert response.json() == {
        "openapi": "3.1.0",

    assert response.json() == {"detail": "Incorrect username or password"}
    assert response.headers["WWW-Authenticate"] == "Basic"


def test_security_http_basic_invalid_password(client: TestClient):
    response = client.get("/users/me", auth=("stanleyjobson", "wrongpassword"))
    assert response.status_code == 401, response.text
    assert response.json() == {"detail": "Incorrect username or password"}

    client = TestClient(app)
    response = client.post("/optional-list-str")
    assert response.status_code == 200, response.text
    assert response.json() == {"p": None}


def test_model_optional_list_str_missing():
    client = TestClient(app)
    response = client.post("/model-optional-list-str")
    assert response.status_code == 422, response.text
    assert response.json() == {
        "detail": [
            {

    Request request = new Request.Builder()
            .url(url)
            .build();
    try (Response response = client.newCall(request).execute()) {
      assertTrue(response.code() == 200 || response.code() == 404);
      assertEquals(Protocol.HTTP_2, response.protocol());

      for (Certificate c: response.handshake().peerCertificates()) {
        X509Certificate x = (X509Certificate) c;

# Custom Response Classes - File, HTML, Redirect, Streaming, etc.

There are several custom response classes you can use to create an instance and return them directly from your *path operations*.

Read more about it in the [FastAPI docs for Custom Response - HTML, Stream, File, others](https://fastapi.tiangolo.com/advanced/custom-response/).

You can import them directly from `fastapi.responses`:

```python
from fastapi.responses import (
    FileResponse,

def test(path, headers, expected_status, expected_response, client: TestClient):
    response = client.get(path, headers=headers)
    assert response.status_code == expected_status
    assert response.json() == expected_response


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200
    assert response.json() == {
        "openapi": "3.1.0",

        response.getServerData().securityMode = 1;
        response.getServerData().encryptedPasswords = true;
        response.getServerData().smaxMpxCount = 50;
        response.getServerData().maxNumberVcs = 1;
        response.getServerData().maxBufferSize = 16384;
        response.getServerData().maxRawSize = 4096;
        response.getServerData().sessKey = 0x12345678;
        response.getServerData().scapabilities = SmbConstants.CAP_UNICODE;