# 响应 - 更改状态码 { #response-change-status-code }

你可能之前已经了解到，你可以设置默认的[响应状态码](../tutorial/response-status-code.md)。

但在某些情况下，你需要返回一个不同于默认值的状态码。

## 使用场景 { #use-case }

例如，假设你想默认返回一个HTTP状态码为“OK”`200`。

但如果数据不存在，你想创建它，并返回一个HTTP状态码为“CREATED”`201`。

但你仍然希望能够使用`response_model`过滤和转换你返回的数据。

对于这些情况，你可以使用一个`Response`参数。

## 使用 `Response` 参数 { #use-a-response-parameter }

你可以在你的*路径操作函数*中声明一个`Response`类型的参数（就像你可以为cookies和头部做的那样）。

Sebastián Ramírez <******@****.***> 1774026397 +0100

Sebastián Ramírez <******@****.***> 1773942980 +0100

        assertEquals(newFlags, leaseContext.getLeaseFlags());
    }

    @Test
    @DisplayName("Should encode context correctly")
    void testEncode() {
        byte[] buffer = new byte[leaseContext.size()];
        int encoded = leaseContext.encode(buffer, 0);

        assertEquals(leaseContext.size(), encoded);

        // Verify context header structure according to MS-SMB2

	// Parse date header.
	var err error
	date, err = time.Parse(iso8601Format, dateStr)
	if err != nil {
		return cred, "", "", time.Time{}, ErrMalformedDate
	}

	// Query string.
	queryStr := req.Form.Encode()

	// Get canonical request.
	canonicalRequest := getCanonicalRequest(extractedSignedHeaders, payload, queryStr, req.URL.Path, req.Method)

	// Get string to sign from canonical request.

		tmpEvt := struct{ Records []event.Event }{[]event.Event{{}}}
		for {
			select {
			case ev := <-localCh:
				buf.Reset()
				tmpEvt.Records[0] = ev
				if err := enc.Encode(tmpEvt); err != nil {
					bugLogIf(ctx, err, "event: Encode failed")
					continue
				}
				mergeCh <- append(grid.GetByteBuffer()[:0], buf.Bytes()...)
			case <-ctx.Done():
				grid.PutByteBuffer(buf.Bytes())
				return
			}
		}

        assertThrows(IllegalArgumentException.class, () -> new Smb2LeaseKey(new byte[17]));
        assertThrows(IllegalArgumentException.class, () -> new Smb2LeaseKey(new byte[0]));
    }

    @Test
    @DisplayName("Should encode lease key to buffer")
    void testEncode() {
        byte[] testBytes = new byte[] { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, (byte) 0x88, (byte) 0x99, (byte) 0xAA, (byte) 0xBB,

          // otherwise try to presize a StringBuilder
          // it is kind of lame that we need to construct a decoder to access this value.
          // if this is a concern we could add special cases for some known charsets (like utf8)
          // or we could avoid inputstreamreader and use the decoder api directly
          // TODO(lukes): in a real implementation we would need to handle overflow conditions

          // otherwise try to presize a StringBuilder
          // it is kind of lame that we need to construct a decoder to access this value.
          // if this is a concern we could add special cases for some known charsets (like utf8)
          // or we could avoid inputstreamreader and use the decoder api directly
          // TODO(lukes): in a real implementation we would need to handle overflow conditions

Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build !purego package aes import ( "crypto/internal/fips140deps/cpu" "crypto/internal/impl" ) type code int // Function codes for the cipher message family of instructions. const ( aes128 code = 18 aes192 code = 19 aes256 code = 20 ) type block struct { function code // code for cipher message instruction key []byte // key (128, 192 or 256 bits)...