diff --git a/src/main/java/dev/dinauer/oidcproxy/ProxyResource.java b/src/main/java/dev/dinauer/oidcproxy/ProxyResource.java
index c86e3f5..8dbf3f8 100644
--- a/src/main/java/dev/dinauer/oidcproxy/ProxyResource.java
+++ b/src/main/java/dev/dinauer/oidcproxy/ProxyResource.java
@@ -86,7 +86,14 @@ public class ProxyResource
         HttpRequest.Builder builder = HttpRequest.newBuilder().method(method.name(), HttpRequest.BodyPublishers.noBody()).uri(URI.create(forwardRoot + "/" + forwardPath));
         for (Map.Entry<String, String> entry : headers.entries())
         {
-            builder.header(entry.getKey(), entry.getValue());
+            try
+            {
+                builder.header(entry.getKey(), entry.getValue());
+            }
+            catch (Exception e)
+            {
+                // empty
+            }
         }
         if (auth != null && Strings.CI.equals("OIDC", strategy))
         {