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rmaucher pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git

commit 11be2fec9184b0b9b6b7f4addac7e396b4b56498
Author: opencode <[email protected]>
AuthorDate: Wed Sep 30 16:14:38 2026 +0200

    Ignore a null charset in the AddDefaultCharsetFilter response wrapper 
rather than storing it and later appending a literal charset=null parameter to 
the Content-Type header
---
 java/org/apache/catalina/filters/AddDefaultCharsetFilter.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/java/org/apache/catalina/filters/AddDefaultCharsetFilter.java 
b/java/org/apache/catalina/filters/AddDefaultCharsetFilter.java
index e2e6ac4ccd..9c70623cc0 100644
--- a/java/org/apache/catalina/filters/AddDefaultCharsetFilter.java
+++ b/java/org/apache/catalina/filters/AddDefaultCharsetFilter.java
@@ -148,7 +148,9 @@ public class AddDefaultCharsetFilter extends FilterBase {
         @Override
         public void setCharacterEncoding(String charset) {
             super.setCharacterEncoding(charset);
-            encoding = charset;
+            if (charset != null) {
+                encoding = charset;
+            }
         }
     }
 }


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