From 0154160c7dcf74508a4b57ac44f4f135022cccb4 Mon Sep 17 00:00:00 2001
From: Arnaud Roques <plantuml@gmail.com>
Date: Tue, 6 Dec 2022 18:52:30 +0100
Subject: [PATCH] Improve tests

---
 .../java/net/sourceforge/plantuml/servlet/ProxyServlet.java    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/net/sourceforge/plantuml/servlet/ProxyServlet.java b/src/main/java/net/sourceforge/plantuml/servlet/ProxyServlet.java
index 151e35b..0a7e026 100644
--- a/src/main/java/net/sourceforge/plantuml/servlet/ProxyServlet.java
+++ b/src/main/java/net/sourceforge/plantuml/servlet/ProxyServlet.java
@@ -64,6 +64,9 @@ public class ProxyServlet extends HttpServlet {
     }
 
     public static boolean forbiddenURL(String full) {
+        if (full == null) {
+            return true;
+        }
         if (full.startsWith("https://") == false && full.startsWith("http://") == false) {
             return true;
         }