The same models are shared among requests, so, it's not one model per request, or one per user or something similar.

Let's imagine that loading the model can **take quite some time**, because it has to read a lot of **data from disk**. So you don't want to do it for every request.

# Test Client - `TestClient`

You can use the `TestClient` class to test FastAPI applications without creating an actual HTTP and socket connection, just communicating directly with the FastAPI code.

Read more about it in the [FastAPI docs for Testing](https://fastapi.tiangolo.com/tutorial/testing/).

You can import it directly from `fastapi.testclient`:

```python
from fastapi.testclient import TestClient
```

        {
            "openapi": "3.1.0",
            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/app": {
                    "get": {
                        "summary": "Read Main",
                        "operationId": "read_main_app_get",
                        "responses": {
                            "200": {
                                "description": "Successful Response",

name: VulnCheck
on:
  pull_request:
    branches:
      - master

  push:
    branches:
      - master

permissions:
  contents: read # to fetch code (actions/checkout)

jobs:
  vulncheck:
    name: Analysis
    runs-on: ubuntu-latest
    steps:
      - name: Check out code into the Go module directory
        uses: actions/checkout@v4
      - name: Set up Go
        uses: actions/setup-go@v5
        with:

		if err != nil {
			t.Fatalf("Test %d: failed to create ErasureStorage: %v", i, err)
		}
		disks := setup.disks
		data := make([]byte, test.data)
		if _, err = io.ReadFull(crand.Reader, data); err != nil {
			t.Fatalf("Test %d: failed to generate random test data: %v", i, err)
		}

		writeAlgorithm := test.algorithm
		if !test.algorithm.Available() {
			writeAlgorithm = DefaultBitrotAlgorithm

pkg encoding/binary, type AppendByteOrder interface, AppendUint64([]uint8, uint64) []uint8 #50601
pkg encoding/binary, type AppendByteOrder interface, String() string #50601
pkg encoding/csv, method (*Reader) InputOffset() int64 #43401
pkg encoding/xml, method (*Decoder) InputPos() (int, int) #45628
pkg flag, func TextVar(encoding.TextUnmarshaler, string, encoding.TextMarshaler, string) #45754

/// tip | Совет

Следующие разделы не обязательно являются «продвинутыми».

И возможно, что решение для вашего варианта использования находится в одном из них.

///

## Сначала прочитайте руководство { #read-the-tutorial-first }

В следующих разделах предполагается, что вы уже прочитали основной [Учебник — Руководство пользователя: Безопасность](../../tutorial/security/index.md).

/// tip | Tipp

Die nächsten Abschnitte sind **nicht unbedingt „fortgeschritten“**.

Und es ist möglich, dass für Ihren Anwendungsfall die Lösung in einem davon liegt.

///

## Das Tutorial zuerst lesen { #read-the-tutorial-first }

Die nächsten Abschnitte setzen voraus, dass Sie das Haupt-[Tutorial – Benutzerhandbuch: Sicherheit](../../tutorial/security/index.md) bereits gelesen haben.

If something seems interesting and useful to your project, go ahead and check it, but otherwise, you might probably just skip them.

/// tip

If you want to **learn FastAPI** in a structured way (recommended), go and read the [Tutorial - User Guide](../tutorial/index.md) chapter by chapter instead.

/// tip | Consejo

Las siguientes secciones no son necesariamente "avanzadas".

Y es posible que para tu caso de uso, la solución esté en una de ellas.

///

## Lee primero el Tutorial { #read-the-tutorial-first }

Las siguientes secciones asumen que ya leíste el [Tutorial - Guía del Usuario: Seguridad](../../tutorial/security/index.md) principal.