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


The following commit(s) were added to refs/heads/9.0.x by this push:
     new 216602ef8b Fix case sensitivity issues in trailer header allow list
216602ef8b is described below

commit 216602ef8b88d248764801072cc6f849f4a2f860
Author: Mark Thomas <[email protected]>
AuthorDate: Wed Sep 24 18:15:58 2025 +0100

    Fix case sensitivity issues in trailer header allow list
    
    Found by TCK failure
---
 java/org/apache/tomcat/util/http/MimeHeaders.java | 3 ++-
 webapps/docs/changelog.xml                        | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/java/org/apache/tomcat/util/http/MimeHeaders.java 
b/java/org/apache/tomcat/util/http/MimeHeaders.java
index 2c644a23c5..749520a640 100644
--- a/java/org/apache/tomcat/util/http/MimeHeaders.java
+++ b/java/org/apache/tomcat/util/http/MimeHeaders.java
@@ -22,6 +22,7 @@ import java.io.StringWriter;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 
@@ -164,7 +165,7 @@ public class MimeHeaders {
         int j = -1;
         for (int i = 0; i < count; i++) {
             String name = headers[i].getName().toStringType();
-            if (allowedHeaders.contains(name)) {
+            if 
(allowedHeaders.contains(name.trim().toLowerCase(Locale.ENGLISH))) {
                 ++j;
                 if (j != i) {
                     headers[j] = headers[i];
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 10b3508529..33850bb3d5 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -128,6 +128,9 @@
       <fix>
         Further performance improvements for ParameterMap. (jengebr/markt)
       </fix>
+      <fix>
+        Fix a case-sensitivity issue in the trailer header allow list. (markt)
+      </fix>
     </changelog>
   </subsection>
   <subsection name="Coyote">


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