val code = response.code
      if (code != HTTP_TEMP_REDIRECT && code != HTTP_PERM_REDIRECT) return response
      val method = response.request.method
      if (method == "GET" || method == "HEAD") return response
      val location = response.header("Location") ?: return response
      return response
        .newBuilder()
        .removeHeader("Location")
        .header("LegacyRedirectInterceptor-Location", location)

# 响应 - 更改状态码

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){.internal-link target=_blank}。

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

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

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）。

然后你可以在这个*临时*响应对象中设置`status_code`。

# `Response` class

You can declare a parameter in a *path operation function* or dependency to be of type `Response` and then you can set data for the response like headers or cookies.

You can also use it directly to create an instance of it and return it from your *path operations*.

You can import it directly from `fastapi`:

```python
from fastapi import Response
```

        int result2 = response2.readDataWireFormat(buffer, 20, sourceData.length);
        assertEquals(sourceData.length, result2);

        // Test with offset near end
        byte[] outputBuffer3 = new byte[1024];
        TransCallNamedPipeResponse response3 = new TransCallNamedPipeResponse(mockConfig, outputBuffer3);
        System.arraycopy(sourceData, 0, buffer, 45, sourceData.length);

            assertEquals(10, response1.getChunksWritten());
            assertEquals(4096, response1.getChunkBytesWritten());
            assertEquals(40960, response1.getTotalBytesWritten());

            assertEquals(20, response2.getChunksWritten());
            assertEquals(8192, response2.getChunkBytesWritten());
            assertEquals(163840, response2.getTotalBytesWritten());
        }

        SMBUtil.writeInt2(TransPeekNamedPipeResponse.STATUS_CONNECTION_OK, buffer, 4);

        response1.readParametersWireFormat(buffer, 0, 6);

        // Assert
        assertNotSame(response1, response2);
        assertEquals(100, response1.getAvailable());
        assertEquals(0, response2.getAvailable());
    }

    @Test
    @DisplayName("All write methods should consistently return 0")

        assertEquals(0, response.writeDataWireFormat(null, 0));

        // Read methods return 0 without accessing null buffer
        assertEquals(0, response.readSetupWireFormat(null, 0, 0));
        assertEquals(0, response.readParametersWireFormat(null, 0, 0));
        assertEquals(0, response.readDataWireFormat(null, 0, 0));
    }

    @Test

    val response1 = client.newCall(request1).execute()
    assertThat(response1.code).isEqualTo(401)
    assertThat(response1.body.string())
      .isEqualTo("{\"error\":{\"message\":\"No auth credentials found\",\"code\":401}}")

    val request2 = request1.newBuilder().header("Authorization", "XYZ").build()
    val response2 = client.newCall(request2).execute()

            val response1 = chain.proceed(chain.request())
            response1.body.close()
            chain.proceed(chain.request())
          },
        ).build()
    val request =
      Request
        .Builder()
        .url(server.url("/"))
        .build()
    val response = client.newCall(request).execute()
    assertThat("b").isEqualTo(response.body.string())
  }

    server.enqueue(MockResponse(body = "response that will never be received"))
    val response = executeSynchronously("/")
    response.assertFailure(
      // JDK 11 response to the FAIL_HANDSHAKE:
      SSLException::class.java,
      // RI response to the FAIL_HANDSHAKE:
      SSLProtocolException::class.java,
      // Android's response to the FAIL_HANDSHAKE:
      SSLHandshakeException::class.java,