RewriteConds:
    - no RewriteMap expansions
    - server variables do not include REQUEST_FILENAME or SCRIPT_FILENAME
    - CondPattern can not test for files, urls or directories
    - %{ENV:variable}, %{SSL:variable}, %{HTTP:header}, %{LA-U:variable}, %{LA-F:variable} not supported

RewriteRules:
    - mapping functions not supported
    - passthrough|PT not implemented (but should work)
    - handler|H not implemented
