httpTracerMiddleware,
	// Auth middleware verifies incoming authorization headers and routes them
	// accordingly. Client receives a HTTP error for invalid/unsupported
	// signatures.
	//
	// Validates all incoming requests to have a valid date header.
	setAuthMiddleware,
	// Redirect some pre-defined browser request paths to a static location
	// prefix.
	setBrowserRedirectMiddleware,

		}
	}

	for _, tag := range ef.Tags {
		if err := tag.Validate(); err != nil {
			return err
		}
	}

	for _, meta := range ef.Metadata {
		if err := meta.Validate(); err != nil {
			return err
		}
	}
	if err := ef.Purge.Validate(); err != nil {
		return err
	}
	if err := ef.Size.Validate(); err != nil {
		return err
	}

Maar standaard werkt alles **“gewoon”**.

### Validatie

* Validatie voor de meeste (of misschien wel alle?) Python **datatypes**, inclusief:
    * JSON objecten (`dict`).
    * JSON array (`list`) die itemtypes definiëren.
    * String (`str`) velden, die min en max lengtes hebben.
    * Getallen (`int`, `float`) met min en max waarden, enz.

* Validatie voor meer exotische typen, zoals:
    * URL.
    * E-mail.

In those cases, you can use a **custom validator function** that is applied after the normal validation (e.g. after validating that the value is a `str`).

You can achieve that using <a href="https://docs.pydantic.dev/latest/concepts/validators/#field-after-validator" class="external-link" target="_blank">Pydantic's `AfterValidator`</a> inside of `Annotated`.

/// tip

	}

	// Validate that the client from sts creds can access the bucket.
	c.mustListObjects(ctx, minioClient, bucket)

	// Validate that a bucket can be created
	bucket2 := getRandomBucketName()
	err = minioClient.MakeBucket(ctx, bucket2, minio.MakeBucketOptions{})
	if err != nil {
		c.Fatalf("bucket creat error: %v", err)
	}

			if errCode != testCase.expected {
				t.Errorf("(%d) expected to get success, instead got %s", i, niceError(errCode))
			}
		}
	}
}

// TestValidateV2AuthHeader - Tests validate the logic of V2 Authorization header validator.
func TestValidateV2AuthHeader(t *testing.T) {
	ctx, cancel := context.WithCancel(t.Context())
	defer cancel()

	obj, fsDir, err := prepareFS(ctx)
	if err != nil {
		t.Fatal(err)
	}

		urlStr     string
		shouldPass bool
	}{
		{"", false},
		{":", false},
		{"http://localhost/", true},
		{"http://127.0.0.1/", true},
		{"proto://myhostname/path", true},
	}

	// Validates fetching local address.
	for i, testCase := range testCases {
		_, err := checkURL(testCase.urlStr)
		if testCase.shouldPass && err != nil {
			t.Errorf("Test %d: expected to pass but got an error: %v\n", i+1, err)
		}

```Python
item: Item
```

...en met die ene verklaring krijg je:

* Editor ondersteuning, inclusief:
    * Code aanvulling.
    * Type validatie.
* Validatie van data:
    * Automatische en duidelijke foutboodschappen wanneer de data ongeldig is.
    * Validatie zelfs voor diep geneste JSON objecten.

    * Swagger UI.
    * ReDoc.

---

Coming back to the previous code example, **FastAPI** will:

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.
    * If it is not, the client will see a useful, clear error.

    * Swagger UI.
    * ReDoc.

---

Coming back to the previous code example, **FastAPI** will:

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.
    * If it is not, the client will see a useful, clear error.