anchor.diff:  |===============================================================================
   |Description|Set the value of a HTTP request header.
   |       Type|Action
  -|     Syntax|`setRequestHeader:=`
  +|     Syntax|`setRequestHeader:<name>=<value>`
   |Cardinality|0..n
   |     Module|core
   |    Version|0.4
  
positive.code: [cols=">h,<9"]
  |===============================================================================
  |Description|Configure predicate to set custom vars (fields).
  |       Type|Action
  |     Syntax|`set_predicate_vars`
  |Cardinality|0..1
  |     Module|predicate
  
negative.code: |===============================================================================
  |Description|Set the value of an HTTP response header.
  |       Type|Action
  |     Syntax|`setResponseHeader:<name>=<value>`
  |Cardinality|0..n
  |     Module|core
  |    Version|0.4
  