Sample XSLT

Refer to the following sample XSLT to store the headers of the request message: 

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:f="http://www.tibco.com/asg/content-types/form"
xmlns:c="http://www.tibco.com/schemas/asg/context"
xmlns:h="http://www.tibco.com/asg/protocols/http"
xmlns:form="http://www.tibco.com/asg/functions/form" exclude-result-prefixes="xsl h c f form">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes" omit-xml-declaration="no"/>
<xsl:variable name="context">
<xsl:for-each select="/transformation/context">
   <xsl:copy-of select="document(@href)"/>
</xsl:for-each>
</xsl:variable>
<xsl:variable name="httpRequest">
<xsl:copy-of select="$context/c:context/c:entry[@key='asg:httpRequest']/h:request"/>
</xsl:variable>		
   <xsl:variable name="request-uri">
   <xsl:copy-of select="$httpRequest/h:request/h:request-uri"/>
   </xsl:variable>		
   <xsl:template match="/">	
   <output>
   <key type="requestURI" log="true">
     <xsl:copy-of select="normalize-space($request-uri)"/>
   </key>
   <key type="clientIP" log="true">
   <xsl:choose>
   <xsl:when    test="$httpRequest/h:request/h:header[lower-case(@name)='x-forw   arded-for']">
   <xsl:value-of    select="$httpRequest/h:request/h:header[lower-case(@name)='x-fo   rwarded-for']"/>
   </xsl:when>
   <xsl:otherwise>
     <xsl:value-of select="$httpRequest/h:request/h:client-ip"/>
   </xsl:otherwise>
   </xsl:choose>
   </key>
   <xsl:for-each select="$httpRequest/h:request/h:header">
   <xsl:variable name="hdr_name" select="@name"/>
   <xsl:if test="lower-case($hdr_name)='host'">
     <key type="host" log="true">
     <xsl:value-of select="."/>
     </key>
   </xsl:if>
   <xsl:if test="lower-case($hdr_name)='apikey'">
     <key type="apikey" log="true">
     <xsl:value-of select="."/>
     </key>
   </xsl:if>
   <xsl:if test="lower-case($hdr_name)='referer'">
     <key type="referer" log="true">
     <xsl:value-of select="."/>
     </key>
   </xsl:if>
   <xsl:if test="lower-case($hdr_name)='user-agent'">
     <key type="useragent" log="true">
     <xsl:value-of select="."/>
     </key>
   </xsl:if>			
</xsl:for-each>
   </output>
   </xsl:template>
   </xsl:stylesheet>

Note: You can use the key elements populated by the parse step XSLT transformation to pass parameters to custom policies, which can be developed leveraging the custom extension mechanism. The SampleStage custom extension in the ASGDefaultImplementation project uses the key elements.