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

- - ### Optional Element Summary

    Optional Elements
    Modifier and Type | Optional Element and Description
    --- | ---
    `String` | `defaultValue` The default value to use as a fallback.
    `boolean` | `required` Whether the header is required.
    `String` | `value` The name of the request header to bind to.

- - ### Element Detail

    - #### value

          public abstract String value

      The name of the request header to bind to.
      Default:
        ""

  - - #### required

          public abstract boolean required

      Whether the header is required.

      Default is `true`, leading to an exception if the header missing. Switch this to `false` if you prefer a `null` in case of the header missing.

      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"