}

// DisableDirectIO - disables directio mode.
func DisableDirectIO(f *os.File) error {
	fd := f.Fd()
	_, err := unix.FcntlInt(fd, unix.F_NOCACHE, 0)
	return err
}

// AlignedBlock - pass through to directio implementation.
func AlignedBlock(blockSize int) []byte {
	return directio.AlignedBlock(blockSize)

This way you write shared code once and **FastAPI** takes care of calling it for your *path operations*.

/// check

Notice that you don't have to create a special class and pass it somewhere to **FastAPI** to "register" it or anything similar.

You just pass it to `Depends` and **FastAPI** knows how to do the rest.

///

## Share `Annotated` dependencies

	fd := f.Fd()
	flag, err := unix.FcntlInt(fd, unix.F_GETFL, 0)
	if err != nil {
		return err
	}
	flag &= ^(syscall.O_DIRECT)
	_, err = unix.FcntlInt(fd, unix.F_SETFL, flag)
	return err
}

// AlignedBlock - pass through to directio implementation.
func AlignedBlock(blockSize int) []byte {
	return directio.AlignedBlock(blockSize)

```Python hl_lines="1  7-8"
{!../../docs_src/using_request_directly/tutorial001.py!}
```

By declaring a *path operation function* parameter with the type being the `Request` **FastAPI** will know to pass the `Request` in that parameter.

/// tip

Note that in this case, we are declaring a path parameter beside the request parameter.

def test_websocket_invalid_path_doesnt_match():
    with pytest.raises(WebSocketDisconnect):
        with client.websocket_connect("/itemsx/portal-gun"):

Você também pode adicionar cabeçalhos quando retornar uma `Response` diretamente.

Crie uma resposta conforme descrito em [Retornar uma resposta diretamente](response-directly.md){.internal-link target=_blank} e passe os cabeçalhos como um parâmetro adicional:

```Python hl_lines="10-12"
{!../../docs_src/response_headers/tutorial001.py!}
```

/// note | "Detalhes técnicos"

/Isaac.Newton-Opticks.txt.bz2", "src/compress/bzip2/testdata/e.txt.bz2", "src/compress/bzip2/testdata/fail-issue5747.bz2", "src/compress/bzip2/testdata/pass-random1.bin", "src/compress/bzip2/testdata/pass-random1.bz2", "src/compress/bzip2/testdata/pass-random2.bin", "src/compress/bzip2/testdata/pass-random2.bz2", "src/compress/bzip2/testdata/pass-sawtooth.bz2", "src/compress/bzip2/testdata/random.data.bz2", "src/compress/flate/", "src/compress/flate/deflate.go", "src/compress/flate/deflate_test.go",...

	data := SerializerStruct{
		Name:            []byte("jinzhu"),
		Roles:           []string{"r1", "r2"},
		Contracts:       map[string]interface{}{"name": "jinzhu", "age": 10},
		EncryptedString: EncryptedString("pass"),
		CreatedTime:     createdAt.Unix(),
		UpdatedTime:     &updatedAt,
		JobInfo: Job{
			Title:    "programmer",
			Number:   9920,
			Location: "Kenmawr",
			IsIntern: false,
		},

/src/go/build/zcgo.go
/src/go/doc/headscan
/src/internal/buildcfg/zbootstrap.go
/src/internal/runtime/sys/zversion.go
/src/unicode/maketables
/src/time/tzdata/zzipdata.go
/test.out
/test/garbage/*.out
/test/pass.out
/test/run.out
/test/times.out

# This file includes artifacts of Go build that should not be checked in.
# For files created by specific development environment (e.g. editor),

@app.get("/http-exception")
def route_with_http_exception():
    raise HTTPException(status_code=400)


@app.get("/request-validation/{param}/")
def route_with_request_validation_exception(param: int):
    pass  # pragma: no cover


@app.get("/server-error")
def route_with_server_error():
    raise RuntimeError("Oops!")


def test_override_http_exception():
    response = client.get("/http-exception")