Header (Spring Framework 4.3.30.RELEASE API)

```
@Target(PARAMETER)
@Retention(RUNTIME)
@Documented
public @interface Header
```
Annotation which indicates that a method parameter should be bound to a message header.
从以下版本开始:
4.0
作者:
Rossen Stoyanchev, Sam Brannen

可选元素概要

可选元素
修饰符和类型	可选元素	说明
`String`	`defaultValue`	The default value to use as a fallback.
`String`	`name`	The name of the request header to bind to.
`boolean`	`required`	Whether the header is required.
`String`	`value`	Alias for `name()`.

- 元素详细资料
  - value
```
@AliasFor("name")
String value
```
    Alias for name().
    默认值:
    ""
- - name
```
@AliasFor("value")
String name
```
    The name of the request header to bind to.
    从以下版本开始:
    4.2
    默认值:
    ""
- - required
```
boolean required
```
    Whether the header is required.
    Default is true, leading to an exception if the header is missing. Switch this to false if you prefer a null value in case of a header missing.
    另请参阅:
    defaultValue()
    默认值:
    true
- - defaultValue
```
String defaultValue
```
    The default value to use as a fallback.
    Supplying a default value implicitly sets required() to false.
    默认值:
    "\n\t\t\n\t\t\n\ue000\ue001\ue002\n\t\t\t\t\n"