func (a adminAPIHandlers) SRPeerBucketOps(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	objectAPI, _ := validateAdminReq(ctx, w, r, policy.SiteReplicationOperationAction)
	if objectAPI == nil {
		return
	}

	vars := mux.Vars(r)
	bucket := vars["bucket"]
	operation := madmin.BktOp(vars["operation"])

	var err error
	switch operation {

If you pass a "callable" as a dependency in **FastAPI**, it will analyze the parameters for that "callable", and process them in the same way as the parameters for a *path operation function*. Including sub-dependencies.

That also applies to callables with no parameters at all. The same as it would be for *path operation functions* with no parameters.

Then, we can change the dependency "dependable" `common_parameters` from above to the class `CommonQueryParams`:

# Middleware (Проміжний шар)

У **FastAPI** можна додавати middleware (проміжний шар).

"Middleware" — це функція, яка працює з кожним **запитом** перед його обробкою будь-якою конкретною *операцією шляху* (*path operation*), а також з кожною **відповіддю** перед її поверненням.

* Middleware отримує кожен **запит**, що надходить до Вашого застосунку.
* Може виконати певні дії із цим **запитом** або запустити необхідний код.

* A particular program while it is **running** on the operating system.
    * This doesn't refer to the file, nor to the code, it refers **specifically** to the thing that is being **executed** and managed by the operating system.
* Any program, any code, **can only do things** when it is being **executed**. So, when there's a **process running**.

Similarly, you cannot redefine a path operation:

{* ../../docs_src/path_params/tutorial003b.py hl[6,11] *}

The first one will always be used since the path matches first.

## Predefined values { #predefined-values }

De manera similar, no puedes redefinir una path operation:

{* ../../docs_src/path_params/tutorial003b.py hl[6,11] *}

La primera siempre será utilizada ya que el path coincide primero.

## Valores predefinidos

///

Este parámetro no crea ese endpoint / *path operation*, pero declara que la URL `/token` será la que el cliente deberá usar para obtener el token. Esa información se usa en OpenAPI, y luego en los sistemas de documentación interactiva del API.

Pronto también crearemos la verdadera *path operation*.

/// info | Información

    offerAll(elements.iterator());
  }

  /**
   * Adds each member of {@code elements} as a candidate for the top {@code k} elements. This
   * operation takes amortized linear time in the length of {@code elements}. The iterator is
   * consumed after this operation completes.
   *
   * <p>If all input data to this {@code TopKSelector} is in a single {@code Iterator}, prefer

```

...isto ocorre porque o gerador de clientes usa o **operation ID** interno do OpenAPI para cada *operação de rota*.

O OpenAPI exige que cada operation ID seja único em todas as *operações de rota*, então o FastAPI usa o **nome da função**, o **caminho** e o **método/operacao HTTP** para gerar esse operation ID, porque dessa forma ele pode garantir que os operation IDs sejam únicos.

Mas eu vou te mostrar como melhorar isso a seguir. 🤓

     * Maybe semantics packet flag
     */
    int RPC_C_PF_MAYBE = 0x04;
    /**
     * Idempotent operation packet flag
     */
    int RPC_C_PF_IDEMPOTENT = 0x08;
    /**
     * Broadcast with maybe semantics packet flag
     */
    int RPC_C_PF_BROADCAST_MAYBE = 0x10;
    /**
     * Not idempotent operation packet flag
     */
    int RPC_C_PF_NOT_IDEMPOTENT = 0x20;
    /**