```

`app.add_middleware()` recibe una clase de middleware como primer argumento y cualquier argumento adicional que se le quiera pasar al middleware.

## Middlewares integrados { #integrated-middlewares }

**FastAPI** incluye varios middlewares para casos de uso común, veremos a continuación cómo usarlos.

/// note | Detalles Técnicos

Para los próximos ejemplos, también podrías usar `from starlette.middleware.something import SomethingMiddleware`.

	}
	return encodedResource
}

// Return string to sign under two different conditions.
// - if expires string is set then string to sign includes date instead of the Date header.
// - if expires string is empty then string to sign includes date header instead.
func getStringToSignV2(method string, encodedResource, encodedQuery string, headers http.Header, expires string) string {

     * from lower versions plus additional checks specific to that version.
     */
    enum Version {
        /**
         * Base validation level that applies to all POM versions.
         * Includes fundamental structural validations.
         */
        BASE,

        /**
         * Validation for Maven 2.0 POM format.
         */
        V20,

        /**

  It hashes together all the branch names and hashes
  and then all the bookmark names and hashes.
  Tags are stored in .hgtags files in any of the branches,
  so the branch metadata includes the tags as well.
  """
  h = hashlib.sha256()
  peer = hg.peer(ui, {}, url)
  for name, revs in peer.branchmap().items():
    h.update(name)
    for r in revs:
      h.update(b' ')
      h.update(r)

    /**
     * Vendor-specific default packages.  If no packages are specified in
     * "java.protocol.handler.pkgs", the VM uses one or more default
     * packages, which are vendor specific.  Sun's is included below
     * for convenience; others could be as well.  If a particular vendor's
     * package isn't listed, it can be specified in
     * "java.protocol.handler.pkgs".
     */

* **Uvicorn** :
    * A les meilleures performances, étant donné qu'il n'a pas beaucoup de code mis-à-part le serveur en lui-même.

                    tasks =
                        "clean sanityCheck test ${extraTasks.joinToString(
                            " ",
                        )} -PflakyTests=${FlakyTestStrategy.EXCLUDE} --no-configuration-cache"
                    gradleHome = "%teamcity.build.checkoutDir%/dogfood-second"
                    gradleParams = defaultParameters
                }
            },
        )
    })

* <a href="https://www.uvicorn.dev" target="_blank"><code>uvicorn</code></a> - para el servidor que carga y sirve tu aplicación. Esto incluye `uvicorn[standard]`, que incluye algunas dependencias (por ejemplo, `uvloop`) necesarias para servir con alto rendimiento.
* `fastapi-cli[standard]` - para proporcionar el comando `fastapi`.

 *
 * <p>
 * This exception can be thrown when there are problems accessing URLs, files, or any other resources needed for crawling.
 * It includes constructors to handle messages, causes, or both.
 * </p>
 *
 * <p>
 * The log level can be set to DEBUG, INFO, WARN, or ERROR, and the class provides methods to check if a specific log level is enabled.
 * </p>
 *

ECL0013=argument[{0}] is null or empty map.
ECL0014=argument[{0}] which is null the index of array is negative integer.
ECL0015=argument[{0}] which is null the index of array exceed the size of array[{1}].
ECL0016=key[{0}] is not included in this BeanMap : {1}.
ECL0017=Exception occurred, because {0}
ECL0041={0}''s creation failure, because {1}
ECL0040=IOException occurred, because {0}
ECL0042=An illegal access was generated by {0}, because {1}