}
    }
    return args;
  }

  private <T> @Nullable T getDefaultValue(TypeToken<T> type) {
    // We assume that all defaults are generics-safe, even if they aren't,
    // we take the risk.
    @SuppressWarnings("unchecked")
    T defaultValue = (T) defaults.getInstance(type.getRawType());
    if (defaultValue != null) {
      return defaultValue;
    }

```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。

`dist`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

例えば、いくつかのタイプのセキュリティのために、HTTPエラーにカスタムヘッダを追加できると便利な状況がいくつかあります。

おそらくコードの中で直接使用する必要はないでしょう。

### Upgrade Checklist

- Test all upgrades in a lower environment (DEV, QA, UAT) before applying to production. Performing blind upgrades in production environments carries significant risk.

    for (long x : POSITIVE_LONG_CANDIDATES) {
      for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
        // Promote the long value (rather than using longValue() on the expected value) to avoid
        // any risk of truncation which could lead to a false positive.
        assertEquals(BigIntegerMath.sqrt(valueOf(x), mode), valueOf(LongMath.sqrt(x, mode)));
      }
    }
  }

   * advantage of <a
   * href="https://docs.oracle.com/javase/tutorial/java/generics/genTypeInference.html#type-inference-instantiation">"diamond"
   * syntax</a>. (Unlike here, there is no risk of overload ambiguity, since the {@code ArrayList}
   * constructors very wisely did not accept varargs.)
   *
   * @param initialArraySize the exact size of the initial backing array for the returned array list

HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

  16. Limitation of Liability.

   * </ul>
   *
   * <p>A "coerced" IPv4 address is equivalent to itself.
   *
   * <p>NOTE: This method is failsafe for security purposes: ALL IPv6 addresses (except localhost
   * (::1)) are hashed to avoid the security risk associated with extracting an embedded IPv4
   * address that might permit elevated privileges.
   *
   * @param ip {@link InetAddress} to "coerce"
   * @return {@link Inet4Address} represented "coerced" address

github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
github.com/peterbourgon/diskv v2.0.1+incompatible h1:UBdAOUP5p4RWqPBg048CAvpKN+vxiaj6gdUUzhl4XmI=
github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR/tNboyR3/BZd58JJSHlUSCU=
github.com/pires/go-proxyproto v0.8.0 h1:5unRmEAPbHXHuLjDg01CxJWf91cw3lKHc/0xzKpXEe0=

j")?a.slice(0,-3)+"leS":-1!==e.indexOf("jar")?a.slice(0,-3)+"waQ":-1!==e.indexOf("DIS")?a.slice(0,-3)+"nem":a+" pIq"},past:function(e){var a=e;return a=-1!==e.indexOf("jaj")?a.slice(0,-3)+"Hu\u2019":-1!==e.indexOf("jar")?a.slice(0,-3)+"wen":-1!==e.indexOf("DIS")?a.slice(0,-3)+"ben":a+" ret"},s:"puS lup",ss:Wr,m:"wa\u2019 tup",mm:Wr,h:"wa\u2019 rep",hh:Wr,d:"wa\u2019 jaj",dd:Wr,M:"wa\u2019 jar",MM:Wr,y:"wa\u2019 DIS",yy:Wr},dayOfMonthOrdinalParse:/\d{1,2}\./,ordinal:"%d.",week:{dow:1,doy:4}});var...

inside, no one could possibly hear you.'  And certainly there was
a most extraordinary noise going on within--a constant howling
and sneezing, and every now and then a great crash, as if a dish
or kettle had been broken to pieces.

  `Please, then,' said Alice, `how am I to get in?'

  `There might be some sense in your knocking,' the Footman went