Add header

src/main/java/gov/usgs/earthquake/nshmp/www/hazard/DisaggService.java

@@ -117,7 +117,8 @@ public final class DisaggService {
         .response(response)
         .build();
     String svcResponse = ServletUtil.GSON2.toJson(body);
-    return HttpResponse.ok(svcResponse);
+    return HttpResponse.ok(svcResponse)
+        .header("Connection", "keep-alive");
   }
 
   /*