* Alternatif dokümantasyon da yeni query parameter ve body'yi yansıtacak:

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### Özet { #recap }

Özetle, parametrelerin, body'nin vb. type'larını fonksiyon parametreleri olarak **bir kere** tanımlarsınız.

Bunu standart modern Python tipleriyle yaparsınız.

    /** The key of the message: Password must contain at least one uppercase letter. */
    public static final String ERRORS_password_no_uppercase = "{errors.password_no_uppercase}";

    /** The key of the message: Password must contain at least one lowercase letter. */
    public static final String ERRORS_password_no_lowercase = "{errors.password_no_lowercase}";

)

const letterBytes = "abcdefghijklmnopqrstuvwxyz01234569"
const (
	letterIdxBits = 6                    // 6 bits to represent a letter index
	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

// Random number state.
// We generate random temporary file names so that there's a good

Lors de la création de web API avec FastAPI, s'il y a une erreur dans notre code, FastAPI la contiendra normalement à la seule requête qui a déclenché l'erreur. 🛡

Le client recevra un **500 Internal Server Error** pour cette requête, mais l'application continuera de fonctionner pour les requêtes suivantes au lieu de simplement s'effondrer complètement.

### Erreurs plus importantes - plantages { #bigger-errors-crashes }

<p>
Identifiers name program entities such as variables and types.
An identifier is a sequence of one or more letters and digits.
The first character in an identifier must be a letter.
</p>
<pre class="ebnf">
identifier = letter { letter | unicode_digit } .
</pre>
<pre>
a
_x9
ThisVariableIsExported
αβ
</pre>

<p>
Some identifiers are <a href="#Predeclared_identifiers">predeclared</a>.
</p>

	defer siteLK.RUnlock()

	return s.region
}

var validRegionRegex = regexp.MustCompile("^[a-zA-Z][a-zA-Z0-9-_-]+$")

// validSiteNameRegex - allows lowercase letters, digits and '-', starts with
// letter. At least 2 characters long.
var validSiteNameRegex = regexp.MustCompile("^[a-z][a-z0-9-]+$")

// LookupSite - get site related configuration. Loads configuration from legacy
// region sub-system as well.

				"application/vnd.contact.cmsg",
				"application/vnd.cosmocaller",
				"application/vnd.crick.clicker",
				"application/vnd.crick.clicker.keyboard",
				"application/vnd.crick.clicker.palette",
				"application/vnd.crick.clicker.template",
				"application/vnd.crick.clicker.wordbank",
				"application/vnd.criticaltools.wbs+xml",
				"application/vnd.ctc-posml",
				"application/vnd.ctct.ws+xml",

heads.  She felt very curious to know what it was all about, and
crept a little way out of the wood to listen.

  The Fish-Footman began by producing from under his arm a great
letter, nearly as large as himself, and this he handed over to
the other, saying, in a solemn tone, `For the Duchess.  An
invitation from the Queen to play croquet.'  The Frog-Footman

cError","console","warn","message","stack","readyException","readyList","completed","removeEventListener","readyWait","wait","readyState","doScroll","access","chainable","emptyGet","raw","bulk","_key","rmsPrefix","rdashAlpha","fcamelCase","_all","letter","toUpperCase","camelCase","string","acceptData","owner","Data","uid","defineProperty","configurable","set","data","prop","hasData","dataPriv","dataUser","rbrace","rmultiDash","dataAttr","JSON","parse","removeData","_data","_removeData","attrs","...

//           can be null. The names used for function inputs are normalized
//           names of the operations (usually placeholders) pointed to by
//           `inputs`. These operation names should start with a letter.
//           Normalization will convert all letters to lowercase and
//           non-alphanumeric characters to '_' to make resulting names match
//           the "[a-z][a-z0-9_]*" pattern for operation argument names.