diff --git a/system/Tools/jetty/upstream/etc/jetty.xml b/system/Tools/jetty/upstream/etc/jetty.xml
new file mode 100644
index 0000000000..f3f94bce7b
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+++ b/system/Tools/jetty/upstream/etc/jetty.xml
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+<?xml version="1.0"?><!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "https://jetty.org/configure_9_3.dtd">
+
+<!-- =============================================================== -->
+<!-- Documentation of this file format can be found at:              -->
+<!-- https://jetty.org/documentation/current/            -->
+<!--                                                                 -->
+<!-- Additional configuration files are available in $JETTY_HOME/etc -->
+<!-- and can be mixed in. See start.ini file for the default         -->
+<!-- configuration files.                                            -->
+<!--                                                                 -->
+<!-- For a description of the configuration mechanism, see the       -->
+<!-- output of:                                                      -->
+<!--   java -jar start.jar -?                                        -->
+<!-- =============================================================== -->
+
+<!-- =============================================================== -->
+<!-- Configure a Jetty Server instance with an ID "Server"           -->
+<!-- Other configuration files may also configure the "Server"       -->
+<!-- ID, in which case they are adding configuration to the same     -->
+<!-- instance.  If other configuration have a different ID, they     -->
+<!-- will create and configure another instance of Jetty.            -->
+<!-- Consult the javadoc of o.e.j.server.Server for all              -->
+<!-- configuration that may be set here.                             -->
+<!-- =============================================================== -->
+<Configure id="Server" class="org.eclipse.jetty.server.Server">
+    <!--
+         Upstream Jetty 9.4.58 ships the line <Arg name="threadpool"><Ref
+         refid="threadPool"/></Arg> here. It is silently ignored at runtime because
+         the Server class's only ThreadPool constructor parameter is named 'pool'
+         (not 'threadpool') and the bytecode does not carry MethodParameters, so
+         XmlConfiguration cannot match the name to the constructor. This produces
+         one WARN per startup: "Ignored arg <Arg name="threadpool">...".
+
+         The line is removed here (and the file is vendored from
+         system/Tools/jetty/upstream/etc/jetty.xml via the antrun copy task in
+         modules/perc-jetty/pom.xml) so the Server falls back to its no-arg
+         constructor and a default QueuedThreadPool. The threadpool module's
+         custom-configured threadPool bean is created but not bound to the
+         Server; restoring that binding is a separate, deliberate change
+         (drop the name attribute, e.g. <Arg><Ref refid="threadPool"/></Arg>).
+
+         Tracked in issue #206.
+    -->
+
+    <Call name="addBean">
+      <Arg><Ref refid="byteBufferPool"/></Arg>
+    </Call>
+
+    <!-- =========================================================== -->
+    <!-- Add shared Scheduler instance                               -->
+    <!-- =========================================================== -->
+    <Call name="addBean">
+      <Arg>
+        <New class="org.eclipse.jetty.util.thread.ScheduledExecutorScheduler">
+          <Arg name="name"><Property name="jetty.scheduler.name"/></Arg>
+          <Arg name="daemon" type="boolean"><Property name="jetty.scheduler.daemon" default="false" /></Arg>
+          <Arg name="threads" type="int"><Property name="jetty.scheduler.threads" default="-1" /></Arg>
+        </New>
+      </Arg>
+    </Call>
+
+    <!-- =========================================================== -->
+    <!-- Http Configuration.                                         -->
+    <!-- This is a common configuration instance used by all         -->
+    <!-- connectors that can carry HTTP semantics (HTTP, HTTPS, etc.)-->
+    <!-- It configures the non wire protocol aspects of the HTTP     -->
+    <!-- semantic.                                                   -->
+    <!--                                                             -->
+    <!-- This configuration is only defined here and is used by      -->
+    <!-- reference from other XML files such as jetty-http.xml,      -->
+    <!-- jetty-https.xml and other configuration files which         -->
+    <!-- instantiate the connectors.                                 -->
+    <!--                                                             -->
+    <!-- Consult the javadoc of o.e.j.server.HttpConfiguration       -->
+    <!-- for all configuration that may be set here.                 -->
+    <!-- =========================================================== -->
+    <New id="httpConfig" class="org.eclipse.jetty.server.HttpConfiguration">
+      <Set name="secureScheme"><Property name="jetty.httpConfig.secureScheme" default="https" /></Set>
+      <Set name="securePort"><Property name="jetty.httpConfig.securePort" deprecated="jetty.secure.port" default="8443" /></Set>
+      <Set name="outputBufferSize"><Property name="jetty.httpConfig.outputBufferSize" deprecated="jetty.output.buffer.size" default="32768" /></Set>
+      <Set name="outputAggregationSize"><Property name="jetty.httpConfig.outputAggregationSize" deprecated="jetty.output.aggregation.size" default="8192" /></Set>
+      <Set name="requestHeaderSize"><Property name="jetty.httpConfig.requestHeaderSize" deprecated="jetty.request.header.size" default="8192" /></Set>
+      <Set name="responseHeaderSize"><Property name="jetty.httpConfig.responseHeaderSize" deprecated="jetty.response.header.size" default="8192" /></Set>
+      <Set name="sendServerVersion"><Property name="jetty.httpConfig.sendServerVersion" deprecated="jetty.send.server.version" default="true" /></Set>
+      <Set name="sendDateHeader"><Property name="jetty.httpConfig.sendDateHeader" deprecated="jetty.send.date.header" default="false" /></Set>
+      <Set name="headerCacheSize"><Property name="jetty.httpConfig.headerCacheSize" default="1024" /></Set>
+      <Set name="delayDispatchUntilContent"><Property name="jetty.httpConfig.delayDispatchUntilContent" deprecated="jetty.delayDispatchUntilContent" default="true"/></Set>
+      <Set name="maxErrorDispatches"><Property name="jetty.httpConfig.maxErrorDispatches" default="10"/></Set>
+      <Set name="blockingTimeout"><Property deprecated="jetty.httpConfig.blockingTimeout" name="jetty.httpConfig.blockingTimeout.DEPRECATED" default="-1"/></Set>
+      <Set name="persistentConnectionsEnabled"><Property name="jetty.httpConfig.persistentConnectionsEnabled" default="true"/></Set>
+      <Set name="requestCookieCompliance"><Call class="org.eclipse.jetty.http.CookieCompliance" name="valueOf"><Arg><Property name="jetty.httpConfig.requestCookieCompliance" deprecated="jetty.httpConfig.cookieCompliance" default="RFC6265"/></Arg></Call></Set>
+      <Set name="responseCookieCompliance"><Call class="org.eclipse.jetty.http.CookieCompliance" name="valueOf"><Arg><Property name="jetty.httpConfig.responseCookieCompliance" default="RFC6265"/></Arg></Call></Set>
+      <Set name="multiPartFormDataCompliance"><Call class="org.eclipse.jetty.server.MultiPartFormDataCompliance" name="valueOf"><Arg><Property name="jetty.httpConfig.multiPartFormDataCompliance" default="RFC7578"/></Arg></Call></Set>
+      <Set name="relativeRedirectAllowed"><Property name="jetty.httpConfig.relativeRedirectAllowed" default="false"/></Set>
+    </New>
+
+    <!-- =========================================================== -->
+    <!-- Set the default handler structure for the Server            -->
+    <!-- A handler collection is used to pass received requests to   -->
+    <!-- both the ContextHandlerCollection, which selects the next   -->
+    <!-- handler by context path and virtual host, and the           -->
+    <!-- DefaultHandler, which handles any requests not handled by   -->
+    <!-- the context handlers.                                       -->
+    <!-- Other handlers may be added to the "Handlers" collection,   -->
+    <!-- for example the jetty-requestlog.xml file adds the          -->
+    <!-- RequestLogHandler after the default handler                 -->
+    <!-- =========================================================== -->
+    <Set name="handler">
+      <New id="Handlers" class="org.eclipse.jetty.server.handler.HandlerCollection">
+        <Set name="handlers">
+         <Array type="org.eclipse.jetty.server.Handler">
+           <Item>
+             <New id="Contexts" class="org.eclipse.jetty.server.handler.ContextHandlerCollection"/>
+           </Item>
+           <Item>
+             <New id="DefaultHandler" class="org.eclipse.jetty.server.handler.DefaultHandler"/>
+           </Item>
+         </Array>
+        </Set>
+      </New>
+    </Set>
+
+    <!-- =========================================================== -->
+    <!-- extra server options                                        -->
+    <!-- =========================================================== -->
+    <Set name="stopAtShutdown"><Property name="jetty.server.stopAtShutdown" default="true"/></Set>
+    <Set name="stopTimeout"><Property name="jetty.server.stopTimeout" default="5000"/></Set>
+    <Set name="dumpAfterStart"><Property name="jetty.server.dumpAfterStart" deprecated="jetty.dump.start" default="false"/></Set>
+    <Set name="dumpBeforeStop"><Property name="jetty.server.dumpBeforeStop" deprecated="jetty.dump.stop" default="false"/></Set>
+
+</Configure>