### Eşzamanlılık paralellikten daha mı iyi?

Hayır!  Hikayenin ahlakı bu değil.

/// warning | Advertencia

Esto es, más o menos, una idea "avanzada".

Si apenas estás comenzando con **FastAPI**, podrías querer omitirlo por ahora.

///

### Конкурентность лучше параллелизма? { #is-concurrency-better-than-parallelism }

Нет! Мораль истории не в этом.

the selector if needed.\n@mixin _rfs-media-query-rule {\n\n  @if $rfs-class == enable {\n    @if $rfs-mode == min-media-query {\n      @content;\n    }\n\n    @include _rfs-media-query () {\n      .enable-rfs &,\n      &.enable-rfs {\n        @content;\n      }\n    }\n  }\n  @else {\n    @if $rfs-class == disable and $rfs-mode == min-media-query {\n      .disable-rfs &,\n      &.disable-rfs {\n        @content;\n      }\n    }\n    @include _rfs-media-query () {\n      @content;\n    }\n  }\n}\n\n//...

        // The cache cannot be written.
      }
      return null
    }

    if (requestMethod != "GET") {
      // Don't cache non-GET responses. We're technically allowed to cache HEAD, QUERY and some
      // POST requests, but the complexity of doing so is high and the benefit is low.
      return null
    }

    if (response.hasVaryAll()) {
      return null
    }

		return errCode
	}

	clientETag, err := etag.FromContentMD5(r.Header)
	if err != nil {
		return ErrInvalidDigest
	}

	// Extract either 'X-Amz-Content-Sha256' header or 'X-Amz-Content-Sha256' query parameter (if V4 presigned)
	// Do not verify 'X-Amz-Content-Sha256' if skipSHA256.
	var contentSHA256 []byte
	if skipSHA256 := skipContentSha256Cksum(r); !skipSHA256 && isRequestPresignedSignatureV4(r) {

A primeira sempre será usada, já que o path corresponde primeiro.

## Valores predefinidos { #predefined-values }

Se você tem uma *operação de rota* que recebe um *parâmetro de path*, mas quer que os valores válidos possíveis do *parâmetro de path* sejam predefinidos, você pode usar um <abbr title="Enumeration">`Enum`</abbr> padrão do Python.

### Crie uma classe `Enum` { #create-an-enum-class }

    // Try the same server first
    InetAddress serverAddress = transport.getRemoteAddress();
    
    if (isWitnessServiceAvailable(serverAddress)) {
        return serverAddress;
    }
    
    // Query for cluster witness service via DNS
    try {
        String clusterName = getClusterName(serverAddress);
        if (clusterName != null) {
            return InetAddress.getByName(clusterName + "-witness");
        }

E quando a dependência for resolvida, o **FastAPI** chamará este `checker` como:

```Python
checker(q="somequery")
```

...e passar o que quer que isso retorne como valor da dependência em nossa *função de operação de rota* como o parâmetro `fixed_content_included`:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[22] *}

/// tip | Dica

 *       contents of the current one (for example {@link #transform})
 *   <li>element extraction methods which facilitate the retrieval of certain elements (for example
 *       {@link #last})
 *   <li>query methods which answer questions about the {@code FluentIterable}'s contents (for
 *       example {@link #anyMatch})
 *   <li>conversion methods which copy the {@code FluentIterable}'s contents into a new collection