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function handleRequest(request, response) {
const XSLT = `<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="#bug"?>
<xsl:template name="f" match="/">
<xsl:param name="n" select="0" />
<xsl:apply-templates select="document(concat('${request.path}?', $n))/xsl:stylesheet/xsl:template[@name='f']">
<xsl:with-param name="n" select="$n + 1"/>
</xsl:apply-templates>
<xsl:call-template name="f">
<xsl:with-param name="n" select="$n + 1"/>
</xsl:call-template>
</xsl:template>
</xsl:stylesheet>`;
// reset_counter sets the counter to -1.
if (request.queryString === "reset_counter") {
setState("base", "-1");
response.write("");
return;
}
// record_counter makes us store the current value of the counter.
if (request.queryString === "record_counter") {
setState("base", getState("counter"));
response.write("");
return;
}
// get_counter_change returns the difference between the current
// value of the counter and the value it had when the script was
// loaded with the record_counter query string.
if (request.queryString === "get_counter_change") {
response.write(
String(Number(getState("counter")) - Number(getState("base")))
);
return;
}
// The XSLT code calls the document() function with a URL pointing to
// this script, with the query string set to a counter starting from 0
// and incremementing with every call of the document() function.
// The first load will happen either from the xml-stylesheet PI, or
// with fetch(), to parse a document to pass to
// XSLTProcessor.importStylesheet. In that case the query string will
// be empty, and we don't change the counter value, we only care about
// the loads through the document() function.
if (request.queryString) {
setState("counter", request.queryString);
}
response.setHeader("Content-Type", "text/xml; charset=utf-8", false);
response.write(XSLT);
}