# 直接返回响应

当你创建一个 **FastAPI** *路径操作* 时，你可以正常返回以下任意一种数据：`dict`，`list`，Pydantic 模型，数据库模型等等。

**FastAPI** 默认会使用 `jsonable_encoder` 将这些类型的返回值转换成 JSON 格式，`jsonable_encoder` 在 [JSON 兼容编码器](../tutorial/encoder.md){.internal-link target=_blank} 中有阐述。

然后，**FastAPI** 会在后台将这些兼容 JSON 的数据（比如字典）放到一个 `JSONResponse` 中，该 `JSONResponse` 会用来发送响应给客户端。

但是你可以在你的 *路径操作* 中直接返回一个 `JSONResponse`。

直接返回响应可能会有用处，比如返回自定义的响应头和 cookies。

## 返回 `Response`

		*alg = AWSKms
	default:
		return errors.New("Unknown SSE algorithm")
	}

	return nil
}

// MarshalXML - Marshals given SSE algorithm to valid XML
func (alg *Algorithm) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	return e.EncodeElement(string(*alg), start)
}

// EncryptionAction - for ApplyServerSideEncryptionByDefault XML tag
type EncryptionAction struct {

        return dstIndex - start;
    }

    @Override
    protected int writeDataWireFormat(final byte[] dst, int dstIndex) {
        final int start = dstIndex;
        dstIndex += this.info.encode(dst, dstIndex);

        /* 6 zeros observed with NT */
        SMBUtil.writeInt8(0L, dst, dstIndex);
        dstIndex += 6;

        /*
         * Also observed 4 byte alignment but we stick

     * Default constructor.
     */
    public PathMappingHelper() {
        super();
    }

    private static final Logger logger = LogManager.getLogger(PathMappingHelper.class);

    /** Function matcher for encode URL. */
    protected static final String FUNCTION_ENCODEURL_MATCHER = "function:encodeUrl";

    /** Groovy matcher prefix. */
    protected static final String GROOVY_MATCHER = "groovy:";

            }

            if (++mid == 32000) {
                mid = 1;
            }
            NEGOTIATE_REQUEST.mid = mid;
            final int n = NEGOTIATE_REQUEST.encode(sbuf, 4);
            Encdec.enc_uint32be(n & 0xFFFF, sbuf, 0); /* 4 byte ssn msg header */

            if (LogStream.level >= 4) {
                log.println(NEGOTIATE_REQUEST);

     * all but the first smb of the chaain do not have a header
     * and therefore we do not want to writeHeaderWireFormat. We
     * just recursivly call writeAndXWireFormat.
     */

    @Override
    public int encode(final byte[] dst, int dstIndex) {
        final int start = this.headerStart = dstIndex;

        dstIndex += writeHeaderWireFormat(dst, dstIndex);
        dstIndex += writeAndXWireFormat(dst, dstIndex);

                "-",
            ],
            input=base_content.encode("utf-8"),
            capture_output=True,
        )
        content_target = version_result.stdout.decode("utf-8")
        format_result = subprocess.run(
            [find_ruff_bin(), "format", "-"],
            input=content_target.encode("utf-8"),
            capture_output=True,
        )

        for (int algo : this.compressionAlgorithms) {
            if (algo == algorithm) {
                return true;
            }
        }
        return false;
    }

    @Override
    public int encode(byte[] dst, int dstIndex) {
        if (this.compressionAlgorithms == null) {
            return 0;
        }

        int start = dstIndex;

        // Compression count (2 bytes)

		if err != nil {
			t.Fatalf("Error initializing input HTTP request: %v", err)
		}
		q := inputReq.URL.Query()
		q.Add(testCase.inputQueryKey, testCase.inputQueryValue)
		inputReq.URL.RawQuery = q.Encode()
		inputReq.ParseForm()

		actualResult := isRequestPresignedSignatureV2(inputReq)
		if testCase.expectedResult != actualResult {

	doc := map[string]any{
		"Records": []event.Event{eventData},
	}
	var buf bytes.Buffer
	enc := json.NewEncoder(&buf)
	err := enc.Encode(doc)
	if err != nil {
		return err
	}
	res, err := c.Index(
		index,
		&buf,
		c.Index.WithDocumentID(key),
		c.Index.WithContext(ctx),
	)
	if err != nil {
		return err
	}