## Beim Chat mitmachen

Treten Sie dem 👥 <a href="https://discord.gg/VQjSZaeJmf" class="external-link" target="_blank">Discord-Chatserver</a> 👥 bei und treffen Sie sich mit anderen Mitgliedern der FastAPI-Community.

/// tip | Tipp

   *
   * <p>If {@link CharSource#asByteSource} is called on the returned source with the same charset,
   * the default implementation of this method will ensure that the original {@code ByteSource} is
   * returned, rather than round-trip encoding. Subclasses that override this method should behave
   * the same way.
   */
  public CharSource asCharSource(Charset charset) {
    return new AsCharSource(charset);
  }

  /**

}
```

しかし、クライアントが`http://example.com/items/bar`（存在しない`item_id` `"bar"`）をリクエストした場合、HTTPステータスコード404（"not found"エラー）と以下のJSONレスポンスが返されます:

```JSON
{
  "detail": "Item not found"
}
```

/// tip | 豆知識

`HTTPException`を発生させる際には、`str`だけでなく、JSONに変換できる任意の値を`detail`パラメータとして渡すことができます。

`dict`や`list`などを渡すことができます。

これらは **FastAPI** によって自動的に処理され、JSONに変換されます。

///

## カスタムヘッダーの追加

## Join the chat { #join-the-chat }

Join the 👥 <a href="https://discord.gg/VQjSZaeJmf" class="external-link" target="_blank">Discord chat server</a> 👥 and hang out with others in the FastAPI community.

/// tip

    assertSame(keyThree, newFirst.getKey());
    assertSame(valueThree, newFirst.getValue());
    assertEquals(hashThree, newFirst.getHash());
    assertSame(entryOne, newFirst.getNext());

    // tail (remaining entries are copied in reverse order)
    newFirst = segment.removeFromChainForTesting(entryThree, entryOne);
    assertSame(keyTwo, newFirst.getKey());
    assertSame(valueTwo, newFirst.getValue());

    assertSame(keyThree, newFirst.getKey());
    assertSame(valueThree, newFirst.getValue());
    assertEquals(hashThree, newFirst.getHash());
    assertSame(entryOne, newFirst.getNext());

    // tail (remaining entries are copied in reverse order)
    newFirst = segment.removeFromChainForTesting(entryThree, entryOne);
    assertSame(keyTwo, newFirst.getKey());
    assertSame(valueTwo, newFirst.getValue());

    assertSame(keyThree, newFirst.getKey());
    assertSame(valueThree, newFirst.getValueReference().get());
    assertEquals(hashThree, newFirst.getHash());
    assertSame(entryOne, newFirst.getNext());

    // tail (remaining entries are copied in reverse order)
    newFirst = segment.removeEntryFromChain(entryThree, entryOne);
    assertSame(keyTwo, newFirst.getKey());
    assertSame(valueTwo, newFirst.getValueReference().get());

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		userMeta[ReplicationSsecChecksumHeader] = objInfo.UserDefined[ReplicationSsecChecksumHeader]
	}

	// really big value but its okay on heavily loaded systems. This is just tail end timeout.
	cctx, ccancel := context.WithTimeout(ctx, 10*time.Minute)
	defer ccancel()

	if len(objInfo.Checksum) > 0 {
		cs, _ := getCRCMeta(objInfo, 0, nil)
		for k, v := range cs {

AgB,OAChBE,mBCZR,YAAgD,CAC1C,KAAKvC,KAAL,CAAWuC,aAD+B,wBAEvB,KAAKE,eAFkB,MAGvCzC,MAAQ2C,EAAqB,KAAKtM,SAA1BsM,CAAqC,KAAK3C,KAA1C2C,CAH+B,ECFhD,aAAqC,OACtB,EAANC,MAAY,CAACC,MAAMzJ,aAANyJ,CAAbD,EAAqCE,YCE9C,eAAmD,QAC1C/F,QAAa2C,QAAQ,WAAQ,IAC9BqD,GAAO,GAIP,CAAC,CADH,oDAAsDjM,OAAtD,KAEAkM,EAAU3J,IAAV2J,CANgC,KAQzB,IARyB,IAU1BzB,SAAclI,MAVxB,GCHF,eAA2D,QAClD0D,QAAiB2C,QAAQ,WAAe,IACvCuD,GAAQC,KACVD,MAFyC,GAKnCxB,kBALmC,GAGnC0B,eAAmBD,KAH/B,GCUF,eAA6D,OAC7BnD,EAAKrG,QAA3B4C,IAAAA,OAAQjG,IAAAA,UACR+M,IAC...