participant dep as Dep with yield
participant operation as Path Operation
participant tasks as Background tasks

    Note over client,operation: Can raise exceptions, including HTTPException
    client ->> dep: Start request
    Note over dep: Run code up to yield
    opt raise Exception
        dep -->> handler: Raise Exception
        handler -->> client: HTTP error response
    end

	v2, err := arg2.evalNode(r, tableAlias)
	if err != nil {
		return nil, err
	}
	inferTypeForArithOp(v2)
	startIdx, ok := v2.ToInt()
	if !ok {
		err := fmt.Errorf("Incorrect type for start index argument in %s", sqlFnSubstring)
		return nil, errIncorrectSQLFunctionArgumentType(err)
	}

	length := -1
	// Evaluate the optional FOR argument
	if arg3 != nil {
		v3, err := arg3.evalNode(r, tableAlias)

En muchos casos tu app de FastAPI será más grande, y probablemente usarás tags para separar diferentes grupos de *path operations*.

Por ejemplo, podrías tener una sección para **items** y otra sección para **users**, y podrían estar separadas por tags:

{* ../../docs_src/generate_clients/tutorial002_py39.py hl[21,26,34] *}

### Genera un Cliente TypeScript con tags { #generate-a-typescript-client-with-tags }

	for ok && file != "" {
		// Clean up the common prefixes
		file = trimTrace(file)
		// Get the function name
		_, funcName := filepath.Split(runtime.FuncForPC(pc).Name())
		// Skip duplicate traces that start with file name, "<autogenerated>"
		// and also skip traces with function name that starts with "runtime."
		if !strings.HasPrefix(file, "<autogenerated>") &&
			!strings.HasPrefix(funcName, "runtime.") {

// See the [ZIP specification] for details.
//
// [ZIP specification]: https://support.pkware.com/pkzip/appnote
type FileHeader struct {
	// Name is the name of the file.
	//
	// It must be a relative path, not start with a drive letter (such as "C:"),
	// and must use forward slashes instead of back slashes. A trailing slash
	// indicates that this file is a directory and should have no data.
	Name string

<img src="/img/deployment/https/https01.drawio.svg">

### Начало TLS-рукопожатия { #tls-handshake-start }

Далее браузер будет общаться с этим IP‑адресом на **порту 443** (порт HTTPS).

Первая часть взаимодействия — установить соединение между клиентом и сервером и договориться о криптографических ключах и т.п.

const verbose = false

func goCmd() string {
	var exeSuffix string
	if runtime.GOOS == "windows" {
		exeSuffix = ".exe"
	}
	path := filepath.Join(testenv.GOROOT(nil), "bin", "go"+exeSuffix)
	if _, err := os.Stat(path); err == nil {
		return path
	}
	return "go"
}

// contexts are the default contexts which are scanned.
var contexts = []*build.Context{
	{GOOS: "linux", GOARCH: "386", CgoEnabled: true},

	VUSRA	$0, V7.D2, V8.D2                                 // ERROR "shift out of range"
	CASPD	(R3, R4), (R2), (R8, R9)                         // ERROR "source register pair must start from even register"
	CASPD	(R2, R3), (R2), (R9, R10)                        // ERROR "destination register pair must start from even register"
	CASPD	(R2, R4), (R2), (R8, R9)                         // ERROR "source register pair must be contiguous"

        Doc(
            """
            Mainly for dependencies with `yield`, define when the dependency function
            should start (the code before `yield`) and when it should end (the code
            after `yield`).

            * `"function"`: start the dependency before the *path operation function*
                that handles the request, end the dependency after the *path operation

This code is something you can actually use in your application, save the password hashes in your database, etc.

We are going to start from where we left in the previous chapter and increment it.

## About JWT { #about-jwt }

JWT means "JSON Web Tokens".

It's a standard to codify a JSON object in a long dense string without spaces. It looks like this: