"content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {
                                    "application/json": {
                                        "schema": {

## Declare `Header` parameters { #declare-header-parameters }

Then declare the header parameters using the same structure as with `Path`, `Query` and `Cookie`.

You can define the default value as well as all the extra validation or annotation parameters:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[9] *}

/// note | Technical Details

Avec `Form`, vous pouvez déclarer les mêmes configurations que pour `Body` (ainsi que `Query`, `Path`, `Cookie`), y compris la validation, des exemples, un alias (p. ex. `user-name` au lieu de `username`), etc.

/// info

`Form` est une classe qui hérite directement de `Body`.

///

/// tip | Astuce

                                "content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {
                                    "application/json": {
                                        "schema": {

- Migrated validation in `resource.k8s.io` to declarative validation.
  When the `DeclarativeValidation` feature gate is enabled, mismatches with existing validation are reported via metrics.

                                    }
                                },
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {
                                    "application/json": {
                                        "schema": {

                                        },
                                    },
                                },
                                "description": "Validation Error",
                            },
                        },
                        "summary": "Update Item",
                    },
                },
            },
            "components": {

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.validation;

import org.apache.maven.model.Model;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.model.building.ModelProblemCollector;

/**

nction(b,e,f){e||(e=a("form")),e.each||(e=a(e));var g=function(){var b=a(this),c=b.val();a.split(b.attr("data-sanitize"),function(a){if(!(a in d))throw new Error('Use of unknown sanitize command "'+a+'"');c=d[a](c,b,f)}),b.val(c).trigger("keyup.validation")};e.each(function(){var b=a(this);f.sanitizeAll&&b.find("input,textarea").not(c).each(function(){var b=a(this),c=b.attr("data-sanitize")||"";b.attr("data-sanitize",f.sanitizeAll+" "+c)}),b.find("[data-sanitize]").unbind("blur.sanitation",g).bi...

## 覆盖默认异常处理器 { #override-the-default-exception-handlers }

**FastAPI** 自带了一些默认异常处理器。

当你触发 `HTTPException`，或者请求中包含无效数据时，这些处理器负责返回默认的 JSON 响应。

你也可以用自己的处理器覆盖它们。

### 覆盖请求验证异常 { #override-request-validation-exceptions }

请求中包含无效数据时，**FastAPI** 内部会触发 `RequestValidationError`。

它也内置了该异常的默认处理器。

要覆盖它，导入 `RequestValidationError`，并用 `@app.exception_handler(RequestValidationError)` 装饰你的异常处理器。