HBASE-29531 Addendum fix missing charset in RS Status page (#7594)

Signed-off-by: Tak Lon (Stephen) Wu <taklwu@apache.org>
Signed-off-by: Duo Zhang <zhangduo@apache.org>

Author: PDavid

hbase-server/src/main/resources/hbase-webapps/regionserver/regionserver.jsp

@@ -39,7 +39,7 @@
   if (RSStatusConstants.FORMAT_JSON.equals(format)) {
     response.setContentType("application/json");
   } else {
-    response.setContentType("text/html");
+    response.setContentType("text/html;charset=utf-8");
   }
 
   if (!regionServer.isOnline()) {

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/http/TestRSStatusPage.java

@@ -122,7 +122,7 @@ public void testStatusPage() throws Exception {
     int port = firstServerName.getPort();
 
     URL url = new URL("http://" + hostname + ":" + infoPort + "/regionserver.jsp");
-    String page = TestServerHttpUtils.getPageContent(url, "text/html");
+    String page = TestServerHttpUtils.getPageContent(url, "text/html;charset=utf-8");
 
     assertTrue(page.contains("<title>HBase Region Server: " + masterHostname + "</title>"));