```

#### `RequestValidationError`と`ValidationError`

/// warning | 注意

これらは今のあなたにとって重要でない場合は省略しても良い技術的な詳細です。

///

`RequestValidationError`はPydanticの<a href="https://docs.pydantic.dev/latest/concepts/models/#error-handling" class="external-link" target="_blank">`ValidationError`</a>のサブクラスです。

**FastAPI** は`response_model`でPydanticモデルを使用していて、データにエラーがあった場合、ログにエラーが表示されるようにこれを使用しています。

Dies könnte beispielsweise nützlich sein, um dieselbe API unter verschiedenen Präfixen verfügbar zu machen, z. B. `/api/v1` und `/api/latest`.

Dies ist eine fortgeschrittene Verwendung, die Sie möglicherweise nicht wirklich benötigen, aber für den Fall, dass Sie sie benötigen, ist sie vorhanden.

Это может быть полезным, если нужно предоставить доступ к одному и тому же API через различные префиксы, например, `/api/v1` и `/api/latest`.

Это продвинутый способ, который вам может и не пригодится. Мы приводим его на случай, если вдруг вам это понадобится.

## Включение одного маршрутизатора (`APIRouter`) в другой { #include-an-apirouter-in-another }

// InferBytesType will attempt to infer the data type of bytes.
// Will fail if value type is not bytes or it would result in invalid utf8.
// ORDER: int, float, bool, JSON (object or array), timestamp, string
// If the content is valid JSON, the type will still be bytes.
func (v *Value) InferBytesType() (err error) {
	b, ok := v.ToBytes()
	if !ok {
		return fmt.Errorf("InferByteType: Input is not bytes, but %v", v.GetTypeString())
	}

pkg testing/fstest, type MapFS map[string]*MapFile
pkg testing/fstest, type MapFile struct
pkg testing/fstest, type MapFile struct, Data []uint8
pkg testing/fstest, type MapFile struct, ModTime time.Time
pkg testing/fstest, type MapFile struct, Mode fs.FileMode
pkg testing/fstest, type MapFile struct, Sys interface{}
pkg testing/iotest, func ErrReader(error) io.Reader
pkg testing/iotest, func TestReader(io.Reader, []uint8) error

        for (i in 0 until length) {
          val line = source.readUtf8LineStrict()
          val bytes = Buffer()
          val certificateBytes = line.decodeBase64() ?: throw IOException("Corrupt certificate in cache entry")
          bytes.write(certificateBytes)
          result.add(certificateFactory.generateCertificate(bytes.inputStream()))
        }
        return result
      } catch (e: CertificateException) {

    assertFalse(registration.isExpired(60000));
    
    // Test sequence numbers
    long seq1 = registration.getNextSequenceNumber();
    long seq2 = registration.getNextSequenceNumber();
    assertEquals(seq1 + 1, seq2);
}

@Test
public void testWitnessNotification() {
    WitnessNotification notification = new WitnessNotification(

			[]string{"a/b/c"},
		},
	} {
		t.Run(test.file, func(t *testing.T) {
			t.Parallel()
			z, err := OpenReader(test.file)
			if err != nil {
				t.Fatal(err)
			}
			defer z.Close()
			if err := fstest.TestFS(z, test.want...); err != nil {
				t.Error(err)
			}
		})
	}
}

func TestFSWalk(t *testing.T) {
	for _, test := range []struct {
		file    string

ies/apache-maven-4.0.0-alpha-2-bin.tar.gz http://archive.apache.org/dist/maven/maven-4/4.0.0-alpha-2/source/apache-maven-4.0.0-alpha-2-src.zip http://archive.apache.org/dist/maven/maven-4/4.0.0-alpha-2/source/apache-maven-4.0.0-alpha-2-src.tar.gz Latest stable release 2025-12-13 3.9.12 https://archive.apache.org/dist/maven/maven-3/3.9.12/binaries/apache-maven-3.9.12-bin.zip https://archive.apache.org/dist/maven/maven-3/3.9.12/binaries/apache-maven-3.9.12-bin.tar.gz https://archive.apache.org/dis...

///

If you are using `pip` to install packages (it comes by default with Python), you should **upgrade** it to the latest version.

Many exotic errors while installing a package are solved by just upgrading `pip` first.

/// tip

You would normally do this **once**, right after you create the virtual environment.

///