Add MYUW-002 and MYUW-003 error codes to existing error pages.

CHANGELOG.md

+# Root context and error valve change log
+
+## 1.1.16
+
++ Label the root 403 error page with error code MYUW-002.
++ Label the root 404 error page with error code MYUW-003.
+
+## 1.1.15 and earlier
+
+Prior versions exist, but they predate this change log.

myuw-root-webapp/src/main/webapp/403.html

@@ -17,7 +17,7 @@
 					<img src="/main_logo_w_all.png" alt="University of Wisconsin System Logo" class="uw-logo">
 				</div>
 				<!-- Title -->
-				<h1 class="mdl-layout-title outage-title">Access Denied</h1>
+				<h1 class="mdl-layout-title outage-title">MYUW-002 Access Denied</h1>
 			</div>
 		</header>
 		<main class="mdl-layout__content content-centered">
@@ -26,8 +26,12 @@
 				<div class="mdl-cell mdl-cell--8-col mdl-cell--10-col-phone">
 					<img src="/alert-icon.png" alt="Line art image of an exclamation mark inside of a triangle" class="alert-icon">
 					<h2 class="mr-title">Sorry, you're not authorized to access this page.</h2>
-					<p>If you're here by accident, head back to your MyUW <a href='/web'>homepage</a>.</p>
-					<p>For help with authorization, contact the DoIT <a href="https://kb.wisc.edu/helpdesk/">Help Desk</a>.</p>
+          <p>MyUW determined you're not authorized to access the requested page.</p>
+          <p>This could be because you're really not authorized. If that's the case, trying again will not help.</p>
+          <p>Or it could be because your session timed out or MyUW otherwise got confused. If so, sorry! And trying again may well work for you.</p>
+					<p>Next, you can head back to your MyUW <a href='/web'>homepage</a>.</p>
+					<p>For help with authorization, contact the DoIT <a href="https://kb.wisc.edu/helpdesk/">Help Desk</a>. When contacting the Help Desk, please mention <em>MyUW error code MYUW-002</em>.</p>
+          <p>(Technical detail: MyUW error code MYUW-002: HTTP status code 403 FORBIDDEN issued by the root servlet context.)</p>
 				</div>
 				<div class="mdl-cell mdl-cell--2-col mdl-cell--1-col-phone"></div>
 			</div>

myuw-root-webapp/src/main/webapp/404.html

@@ -19,7 +19,7 @@
 					<img src="/main_logo_w_all.png" alt="University of Wisconsin System Logo" class="uw-logo">
 				</div>
 				<!-- Title -->
-				<h1 class="mdl-layout-title outage-title">Page Not Found</h1>
+				<h1 class="mdl-layout-title outage-title">MYUW-003: Page Not Found</h1>
 			</div>
 		</header>
 		<main class="mdl-layout__content content-centered">
@@ -30,7 +30,8 @@
 					<h2 class="mr-title">Sorry, the page you are looking for does not exist or you don't have access to it.</h2>
           <p>Please go to the <a href='/'>MyUW home page</a>.</p>
 					<p class="apologize">We apologize for the inconvenience. If you feel as though this URL should exist, please drop
-						us a line on our <a href='https://my.wisc.edu/portal/p/feedback'>feedback form</a>.</p>
+						us a line on our <a href='https://my.wisc.edu/portal/p/feedback'>feedback form</a>. When offering feedback or contacting the Help Desk, please mention <strong>MyUW error code MYUW-003</strong>.</p>
+          <p>(Technical detail: HTTP status code 404 NOT FOUND presented by root servlet context.)</p>
 				</div>
 				<div class="mdl-cell mdl-cell--2-col mdl-cell--1-col-phone"></div>
 			</div>