* Implementations must support such concurrent calls.
   *
   * Note that cancellation is best-effort and that a call may proceed normally after it has been
   * canceled. For example, happy-path events like [requestHeadersStart] and [requestHeadersEnd] may
   * occur after a call is canceled. Typically cancellation takes effect when an expensive I/O
   * operation is required.
   *

		// Case with proper components
		{
			bucketName: bucketName,
			objectName: "etc/path/proper/.../etc",
			byteRange:  "",
			accessKey:  credentials.AccessKey,
			secretKey:  credentials.SecretKey,

			expectedContent: encodeResponse(getAPIErrorResponse(ctx,
				getAPIError(ErrNoSuchKey),
				getGetObjectURL("", bucketName, "etc/path/proper/.../etc"),
				"", "")),
			expectedRespStatus: http.StatusNotFound,
		},
	}

     * @return the unescaped string
     */
    protected String unescape(final String s) {
        return s.replace("\\\\", "\\");
    }

    /**
     * Appends a filter path pattern to a string buffer with appropriate wildcards.
     * Handles various pattern formats including anchored patterns and quoted patterns.
     *
     * @param buf the string buffer to append to

/// tip | Підказка

Ми використовуємо `Query()`, оскільки це **query параметр**. Далі ми розглянемо інші варіанти, як-от `Path()`, `Body()`, `Header()` та `Cookie()`, які приймають ті самі аргументи, що й `Query()`.

///

Тепер FastAPI:

* **Перевірить** дані, щоб переконатися, що їхня довжина не перевищує 50 символів

```console
$ uvicorn main:my_awesome_api --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

### Step 3: *path operation*を作成

#### パス

ここでの「パス」とは、最初の`/`から始まるURLの最後の部分を指します。

したがって、次のようなURLでは:

```
https://example.com/items/foo
```

...パスは次のようになります:

```
/items/foo
```

		return
	}

	// Read escaped copy source path to check for parameters.
	cpSrcPath := r.Header.Get(xhttp.AmzCopySource)
	var vid string
	if u, err := url.Parse(cpSrcPath); err == nil {
		vid = strings.TrimSpace(u.Query().Get(xhttp.VersionID))
		// Note that url.Parse does the unescaping
		cpSrcPath = u.Path
	}

	srcBucket, srcObject := path2BucketObject(cpSrcPath)

/// tip | Tipp

Hier verwenden wir `Query()`, weil dies ein **Query-Parameter** ist. Später werden wir andere wie `Path()`, `Body()`, `Header()`, und `Cookie()` sehen, die auch dieselben Argumente wie `Query()` akzeptieren.

///

FastAPI wird nun:

/// tip | Dica

Aqui estamos usando `Query()` porque este é um **parâmetro de consulta**. Mais adiante veremos outros como `Path()`, `Body()`, `Header()` e `Cookie()`, que também aceitam os mesmos argumentos que `Query()`.

///

Agora o FastAPI vai:

* **Validar** os dados garantindo que o comprimento máximo seja de 50 caracteres

    assertTrue(range.containsAll(asList(3, 3, 4, 5)));
    assertFalse(range.containsAll(asList(3, 3, 4, 5, 6)));

    // We happen to know that natural-order sorted sets use a different code
    // path, so we test that separately
    assertTrue(range.containsAll(ImmutableSortedSet.of(3, 3, 4, 5)));
    assertTrue(range.containsAll(ImmutableSortedSet.of(3)));
    assertTrue(range.containsAll(ImmutableSortedSet.<Integer>of()));

	}

	// Query string.
	queryStr := req.Form.Encode()

	// Get canonical request.
	canonicalRequest := getCanonicalRequest(extractedSignedHeaders, payload, queryStr, req.URL.Path, req.Method)

	// Get string to sign from canonical request.
	stringToSign := getStringToSign(canonicalRequest, date, signV4Values.Credential.getScope())

	// Get hmac signing key.