fix(connect): Handle redirect with "con" parameter for proxy requests

When opening new connection tab from Hawtio on Spring Boot, we're
getting redirected without con parameter. This commit fixes this problem.

Fixes hawtio#3317

Signed-off-by: Grzegorz Grzybek <gr.grzybek@gmail.com>

platforms/springboot/src/main/java/io/hawt/springboot/HawtioEndpoint.java

@@ -43,6 +43,10 @@ public String forwardHawtioRequestToIndexHtml(HttpServletRequest request) {
         final String path = endpointPath.resolve("hawtio");
 
         if (request.getRequestURI().equals(path)) {
+            String query = request.getQueryString();
+            if (query != null && !query.isEmpty()) {
+                return "redirect:" + path + "/index.html?" + query;
+            }
             return "redirect:" + path + "/index.html";
         }
 

platforms/springboot/src/main/java/io/hawt/springboot/TrailingSlashFilter.java

@@ -35,6 +35,11 @@ public void doFilter(ServletRequest request, ServletResponse response, FilterCha
             return;
         }
 
-        redirector.doRedirect(httpRequest, httpResponse, "/index.html");
+        String query = httpRequest.getQueryString();
+        if (query != null && !query.isEmpty()) {
+            redirector.doRedirect(httpRequest, httpResponse, "/index.html?" + query);
+        } else {
+            redirector.doRedirect(httpRequest, httpResponse, "/index.html");
+        }
     }
 }