## 使用 `yield` 的 `StreamingResponse` { #a-streamingresponse-with-yield }

如果你在*路径操作函数*中声明 `response_class=StreamingResponse`，你就可以使用 `yield` 依次发送每个数据块。

{* ../../docs_src/stream_data/tutorial001_py310.py ln[1:23] hl[20,23] *}

FastAPI 会将每个数据块原样交给 `StreamingResponse`，不会尝试将其转换为 JSON 或做类似处理。

### 非 async 的*路径操作函数* { #non-async-path-operation-functions }

你也可以使用常规的 `def` 函数（不带 `async`），并以相同方式使用 `yield`。

        buildHeader(buf, headerStart, NtStatus.NT_STATUS_SUCCESS, 0x0001, 0xCAFEBABECAFEF00DL);

        int bodyStart = headerStart + Smb2Constants.SMB2_HEADER_LENGTH;
        byte[] blob = new byte[] { 1, 2, 3 };
        int secBufOffset = Smb2Constants.SMB2_HEADER_LENGTH + 8;
        int sessionFlags = 0; // not guest/null
        buildSessionSetupBody(buf, headerStart, bodyStart, sessionFlags, secBufOffset, blob);

  }

  /**
   * Returns a string containing the supplied {@code char} values separated by {@code separator}.
   * For example, {@code join("-", '1', '2', '3')} returns the string {@code "1-2-3"}.
   *
   * @param separator the text that should appear between consecutive values in the resulting string
   *     (but not at the start or end)

Якщо ви оголосите `response_class=StreamingResponse` у вашій функції операції шляху, ви можете використовувати `yield`, щоб послідовно надсилати кожний фрагмент даних.

{* ../../docs_src/stream_data/tutorial001_py310.py ln[1:23] hl[20,23] *}

FastAPI передаватиме кожний фрагмент даних до `StreamingResponse` як є; він не намагатиметься перетворити його на JSON чи щось подібне.

### Не-async функції операції шляху { #non-async-path-operation-functions }

      }
    }
    return flip(max);
  }

  /**
   * Returns a string containing the supplied unsigned {@code int} values separated by {@code
   * separator}. For example, {@code join("-", 1, 2, 3)} returns the string {@code "1-2-3"}.
   *
   * @param separator the text that should appear between consecutive values in the resulting string
   *     (but not at the start or end)

 * Stopwatch stopwatch = Stopwatch.createStarted();
 * doSomething();
 * stopwatch.stop(); // optional
 *
 * Duration duration = stopwatch.elapsed();
 *
 * log.info("time: " + stopwatch); // formatted string like "12.3 ms"
 * }
 *
 * <p>The state-changing methods are not idempotent; it is an error to start or stop a stopwatch
 * that is already in the desired state.
 *

  }

  public void testColumnSetPartialOverlap() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 2, 'c', "bar", 3, 'd');
    assertThat(table.columnKeySet()).containsExactly(1, 2, 3);
  }

  @J2ktIncompatible
  @GwtIncompatible // NullPointerTester
  public void testNullPointerInstance() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 2, 'c', "bar", 3, 'd');

        assertEquals(0, response.getResponseLength());
    }

    @Test
    void testMultipleReads() throws SMBProtocolDecodingException {
        // First read
        byte[] firstData = { 1, 2, 3 };
        byte[] buffer1 = new byte[10];
        System.arraycopy(firstData, 0, buffer1, 0, firstData.length);
        response.readDataWireFormat(buffer1, 0, firstData.length);

        // Verify first data

 * So, using the multimap shown above as an example, the {@link #size} is {@code 3}, not {@code 2},
 * and the {@link #values} collection is {@code [1, 2, 3]}, not {@code [[1, 2], [3]]}. For those
 * times when the first style is more useful, use the multimap's {@link #asMap} view (or create a
 * {@code Map<K, Collection<V>>} in the first place).
 *
 * <h3>Example</h3>
 *

    multimap.put("bar", 1);
    multimap.putAll("foo", asList(-1, 2, 4));
    multimap.putAll("bar", asList(2, 3));
    multimap.put("foo", 1);
    assertThat(multimap.toString()).isEqualTo("{foo=[3, -1, 2, 4, 1], bar=[1, 2, 3]}");
  }

  public void testOrderingReadOnly() {
    SetMultimap<String, Integer> multimap = initializeMultimap5();
    assertOrderingReadOnly(multimap);
  }

  public void testOrderingUnmodifiable() {