In the output, there's a line with something like:

```hl_lines="4"
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

That line shows the URL where your app is being served on your local machine.

### Check it { #check-it }

Open your browser at [http://127.0.0.1:8000](http://127.0.0.1:8000).

You will see the JSON response as:

```JSON
{"message": "Hello World"}
```

browser --> proxy
proxy --> server
```

/// tip | Astuce

L'IP `0.0.0.0` est couramment utilisée pour signifier que le programme écoute sur toutes les IP disponibles de cette machine/serveur.

///

L'interface de documents doit également indiquer dans le schéma OpenAPI que ce `server` d'API se trouve à `/api/v1` (derrière le proxy). Par exemple :

```JSON hl_lines="4-8"
{

*----+------+------+
| <<<maven.repo.local>>> | The repository on the local machine Maven shall use to store installed and downloaded artifacts (POMs, JARs, etc). | <<<$\{user.home\}/.m2/repository>>> |
*----+------+------+

</div>

Dans la sortie, il y a une ligne semblable à :

```hl_lines="4"
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

Cette ligne montre l’URL où votre application est servie, sur votre machine locale.

### Vérifier { #check-it }

Ouvrez votre navigateur à l’adresse [http://127.0.0.1:8000](http://127.0.0.1:8000).

Vous verrez la réponse JSON suivante :

```JSON
{"message": "Hello World"}
```

def is_linux():
  return platform.system() == 'Linux'


def is_macos():
  return platform.system() == 'Darwin'


def is_ppc64le():
  return platform.machine() == 'ppc64le'


def is_s390x():
  return platform.machine() == 's390x'


def is_cygwin():
  return platform.system().startswith('CYGWIN_NT')


def get_input(question):
  try:
    try:
      answer = raw_input(question)

        if (q20.ans != null) {
            return q20.ans;
        }
        throw q1x.uhe;
    }

    /**
     * Determines the address of a host given it's host name. The name can be a
     * machine name like "jcifs.samba.org",  or an IP address like "192.168.1.15".
     *
     * @param hostname NetBIOS or DNS hostname to resolve
     * @throws java.net.UnknownHostException if there is an error resolving the name
     */

server["Server on http://127.0.0.1:8000/app"]

browser --> proxy
proxy --> server
```

/// tip

The IP `0.0.0.0` is commonly used to mean that the program listens on all the IPs available in that machine/server.

///

The docs UI would also need the OpenAPI schema to declare that this API `server` is located at `/api/v1` (behind the proxy). For example:

```JSON hl_lines="4-8"
{
    "openapi": "3.1.0",

   *
   * @since 8.0
   */
  public static final byte NUL = 0;

  /**
   * Start of Heading: A communication control character used at the beginning of a sequence of
   * characters which constitute a machine-sensible address or routing information. Such a sequence
   * is referred to as the "heading." An STX character has the effect of terminating a heading.
   *
   * @since 8.0
   */
  public static final byte SOH = 1;

pkg crypto/x509, type RevocationList struct, RawTBSRevocationList []uint8 #50674
pkg crypto/x509, type RevocationList struct, Signature []uint8 #50674
pkg debug/elf, const EM_LOONGARCH = 258 #46229
pkg debug/elf, const EM_LOONGARCH Machine #46229
pkg debug/elf, const R_LARCH_32 = 1 #46229
pkg debug/elf, const R_LARCH_32 R_LARCH #46229
pkg debug/elf, const R_LARCH_64 = 2 #46229
pkg debug/elf, const R_LARCH_64 R_LARCH #46229

### Конкурентность + параллелизм: Веб + Машинное обучение { #concurrency-parallelism-web-machine-learning }

С **FastAPI** вы можете использовать преимущества конкурентности, что очень распространено в веб-разработке (это та же основная «фишка» NodeJS).