org.springframework.messaging.handler.annotation

## Annotation Type Header

    @Target(value=PARAMETER)
     @Retention(value=RUNTIME)
     @Documented
    public @interface Header

Annotation which indicates that a method parameter should be bound to a message header.

Since:
  4.0
Author:
  Rossen Stoyanchev, Sam Brannen

### Optional Element Summary

Optional Elements
`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()`.

### Element Detail

#### value

    @AliasFor(value="name")
    public abstract String value

Alias for `name()`.

Default:
  ""

#### name

    @AliasFor(value="value")
    public abstract String name

The name of the request header to bind to.

Since:
  4.2

Default:
  ""

#### required

    public abstract 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.

See Also:
  `defaultValue()`

Default:
  true

#### defaultValue

    public abstract String defaultValue

The default value to use as a fallback.

Supplying a default value implicitly sets `required()` to `false`.

Default:
  "\n\t\t\n\t\t\n\ue000\ue001\ue002\n\t\t\t\t\n"