}
```

以下のようなテキスト版を取得します:

```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)
```

#### `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。

				// we just got an error on the primary path, so start
				// the fallback immediately (in 0 nanoseconds).
				fallbackTimer.Reset(0)
			}
		}
	}
}

// dialSerial connects to a list of addresses in sequence, returning
// either the first successful connection, or the first error.
func (sd *sysDialer) dialSerial(ctx context.Context, ras addrList) (Conn, error) {

	}{
		{
			func() { klog.Error("foo") },
			"error\tklog\tfoo$",
		},
		{
			func() { klog.Error("foo") },
			"foo$",
		},
		{
			func() { klog.Errorf("fmt %v", "item") },
			"fmt item$",
		},
		{
			func() { klog.Errorf("fmt %v", "item") },
			"fmt item$",
		},
		{
			func() { klog.ErrorS(errors.New("my error"), "info") },
			"error\tklog\tmy error: info",
		},
		{

		if b == 0 {
			t.Error("USER32.IsWindow returns FALSE")
		}
		counter++
		return 1 // continue enumeration
	})
	a, _, _ := d.Proc("EnumWindows").Call(cb, 888)
	if a == 0 {
		t.Error("USER32.EnumWindows returns FALSE")
	}
	if counter == 0 {
		t.Error("Callback has been never called or your have no windows")
	}
}

func callback(timeFormatString unsafe.Pointer, lparam uintptr) uintptr {

	if _, err := c.(*UnixConn).WriteToUnix(b, raddr); err == nil {
		t.Fatal("should fail")
	} else if err.(*OpError).Err != ErrWriteToConnected {
		t.Fatalf("should fail as ErrWriteToConnected: %v", err)
	}
	if _, err = c.(*UnixConn).WriteTo(b, raddr); err == nil {
		t.Fatal("should fail")
	} else if err.(*OpError).Err != ErrWriteToConnected {
		t.Fatalf("should fail as ErrWriteToConnected: %v", err)
	}

// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/mips64/include /tmp/mips64/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.

//go:build mips64 && linux

package unix

const (
	SYS_READ                    = 5000
	SYS_WRITE                   = 5001
	SYS_OPEN                    = 5002
	SYS_CLOSE                   = 5003
	SYS_STAT                    = 5004
	SYS_FSTAT                   = 5005

	if err != nil {
		// If the last error was file not found it implies that no log file was found for the service
		if errors.Is(err, os.ErrNotExist) {
			fmt.Fprintf(w, "\nlog not found for %s\n", service)
			return
		}
		fmt.Fprintf(w, "\nerror getting log for %s: %v\n", service, err)
	}
}

// readerCtx is the interface that wraps io.Reader with a context
type readerCtx struct {
	ctx context.Context
	io.Reader
}

// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/mips/include /tmp/mips/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.

//go:build mips && linux

package unix

const (
	SYS_SYSCALL                      = 4000
	SYS_EXIT                         = 4001
	SYS_FORK                         = 4002
	SYS_READ                         = 4003
	SYS_WRITE                        = 4004

// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/ppc64le/include /tmp/ppc64le/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.

//go:build ppc64le && linux

package unix

const (
	SYS_RESTART_SYSCALL         = 0
	SYS_EXIT                    = 1
	SYS_FORK                    = 2
	SYS_READ                    = 3
	SYS_WRITE                   = 4
	SYS_OPEN                    = 5

	if err != nil {
		err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	return n, addr, err
}

// ReadFrom implements the [PacketConn] ReadFrom method.
func (c *UnixConn) ReadFrom(b []byte) (int, Addr, error) {
	if !c.ok() {
		return 0, nil, syscall.EINVAL
	}
	n, addr, err := c.readFrom(b)
	if err != nil {