WildFly expression variables

Question

Is there any complete list of variables supported in WildFly web configuration expressions (eg rewrite filters)? Like %U, %h, %p...

<filters>
<rewrite name="http-to-https" redirect="true" target="https://myhostname:8443%U"/>
</filters>

<server name="default-server">
    <host name="default-host" alias="localhost">
        ...
        <filter-ref name="http-to-https" predicate="equals(%p,8080)"/>

Answer 1

These are the attributes used by AccessLogHandler.java for log.

%a - Remote IP address

%A - Local IP address

%b - Bytes sent, excluding HTTP headers, or '-' if no bytes were sent

%B - Bytes sent, excluding HTTP headers

%h - Remote host name

%H - Request protocol

%l - Remote logical username from identd (always returns '-')

%m - Request method

%p - Local port

%q - Query string (excluding the '?' character)

%r - First line of the request

%s - HTTP status code of the response

%t - Date and time, in Common Log Format format

%u - Remote user that was authenticated

%U - Requested URL path

%v - Local server name

%D - Time taken to process the request, in millis

%T - Time taken to process the request, in seconds

%I - current Request thread name (can compare later with stacktraces)

In addition, the caller can specify one of the following aliases for commonly utilized patterns:

• common - %h %l %u %t "%r" %s %b
• combined - %h %l %u %t "%r" %s %b "%{i,Referer}" "%{i,User-Agent}"

There is also support to write information from the cookie, incoming header, or the session
It is modeled after the apache syntax:

• %{i,xxx} for incoming headers
• %{o,xxx} for outgoing response headers
• %{c,xxx} for a specific cookie
• %{r,xxx} xxx is an attribute in the ServletRequest
• %{s,xxx} xxx is an attribute in the HttpSession

Answer 2

Current WildFly (15) uses Undertow 2.0 so take a look at Undertow documentation on predicates: http://undertow.io/undertow-docs/undertow-docs-2.0.0/predicates-attributes-handlers.html