Его можно возвращать напрямую.

Он принимает следующие параметры:

- `content` — `str` или `bytes`.
- `status_code` — целое число, HTTP статус-код.
- `headers` — словарь строк.
- `media_type` — строка, задающая тип содержимого. Например, `"text/html"`.

FastAPI (фактически Starlette) автоматически добавит заголовок Content-Length. Также будет добавлен заголовок Content-Type, основанный на `media_type` и с добавлением charset для текстовых типов.

            // Read with UTF-8 encoding
            final String content = new String(is.readAllBytes(), StandardCharsets.UTF_8);

            // Verify encoding doesn't corrupt content
            assertTrue("Content should be valid", content.length() > 0);
            assertTrue("Should not contain encoding errors", !content.contains("\uFFFD"));

            // Verify JSON structure is intact

     * @param parser the function to parse the content.
     * @return the parsed content.
     */
    public <T> T getContent(final Function<CurlResponse, T> parser) {
        return parser.apply(this);
    }

    /**
     * Gets the content of the response as a string.
     *
     * @return the content as a string.
     * @throws CurlException if an error occurs while accessing the content.
     */

        "paths": {
            "/items/": {
                "get": {
                    "operationId": "get_items",
                    "responses": {
                        "200": {
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "items": {

                            "description": "Successful Response",
                            "content": {"application/json": {"schema": {}}},
                        },
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {
                                    "schema": {

    public static final String ACCESS_TIMEOUT_PROPERTY = "accessTimeout";

    /** The property name for maximum content length. */
    public static final String MAX_CONTENT_LENGTH = "maxContentLength";

    /** The property name for maximum cached content size. */
    public static final String MAX_CACHED_CONTENT_SIZE = "maxCachedContentSize";

    /** The crawler container. */
    @Resource

                            "description": "Successful Response",
                            "content": {"application/json": {"schema": {}}},
                        },
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {
                                    "schema": {

                    "operationId": "get_items_items__get",
                    "responses": {
                        "200": {
                            "description": "Successful Response",
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "title": "Response Get Items Items  Get",

async def a():
    pass


@app.get("/b", responses={204: {"description": "No Content"}})
async def b():
    pass  # pragma: no cover


client = TestClient(app)


def test_get_response():
    response = client.get("/a")
    assert response.status_code == 204, response.text
    assert "content-length" not in response.headers
    assert response.content == b""


def test_openapi_schema():

            final Session mailSession = Session.getDefaultInstance(props, null);
            final MimeMessage message = new MimeMessage(mailSession, in);
            final String content = getBodyText(message);
            final ExtractData data = new ExtractData(content != null ? content : StringUtil.EMPTY);
            final Enumeration<Header> headers = message.getAllHeaders();
            while (headers.hasMoreElements()) {