org.eclipse.jetty.rewrite.handler

## Class HeaderRule

- java.lang.Object
- - org.eclipse.jetty.rewrite.handler.Rule
  - - org.eclipse.jetty.rewrite.handler.HeaderRule

- Direct Known Subclasses:
    ForwardedSchemeHeaderRule

      public abstract class HeaderRule
      extends Rule

  Abstract rule that matches against request headers.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.eclipse.jetty.rewrite.handler.Rule

      `Rule.ApplyURI`

  - ### Field Summary

    - ### Fields inherited from class org.eclipse.jetty.rewrite.handler.Rule

      `_handling, _terminating`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `HeaderRule()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected abstract String` | `apply(String target, String value, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)` Apply the rule to the request
    `String` | `getHeader()`
    `String` | `getHeaderValue()`
    `String` | `matchAndApply(String target, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)` This method calls tests the rule against the request/response pair and if the Rule applies, then the rule's action is triggered.
    `void` | `setHeader(String header)`
    `void` | `setHeaderValue(String headerValue)`
    `String` | `toString()` Returns the handling and terminating flag values.

    - ### Methods inherited from class org.eclipse.jetty.rewrite.handler.Rule

      `isHandling, isTerminating, setHandling, setTerminating`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### HeaderRule

          public HeaderRule()

  - ### Method Detail

    - #### getHeader

          public String getHeader()

    - #### setHeader

          public void setHeader(String header)

      Parameters:
        `header` - the header name to check for

    - #### getHeaderValue

          public String getHeaderValue()

    - #### setHeaderValue

          public void setHeaderValue(String headerValue)

      Parameters:
        `headerValue` - the header value to match against. If null, then the presence of the header is enough to match

    - #### matchAndApply

          public String matchAndApply(String target,
                             javax.servlet.http.HttpServletRequest request,
                             javax.servlet.http.HttpServletResponse response)
                               throws IOException

      Description copied from class: `Rule`
      This method calls tests the rule against the request/response pair and if the Rule applies, then the rule's action is triggered.
      Specified by:
        `matchAndApply` in class `Rule`
      Parameters:
        `target` - The target of the request
      Returns:
        The new target if the rule has matched, else null
      Throws:
        `IOException` - TODO

    - #### apply

          protected abstract String apply(String target,
                     String value,
                     javax.servlet.http.HttpServletRequest request,
                     javax.servlet.http.HttpServletResponse response)
                                   throws IOException

      Apply the rule to the request
      Parameters:
        `target` - field to attempt match
        `value` - header value found
        `request` - request object
        `response` - response object
      Returns:
        The target (possible updated)
      Throws:
        `IOException` - exceptions dealing with operating on request or response objects

    - #### toString

          public String toString()

      Description copied from class: `Rule`
      Returns the handling and terminating flag values.
      Overrides:
        `toString` in class `Rule`

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