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The following commit(s) were added to refs/heads/master by this push:
     new e9ee933  BZ 64166. HttpServletResponse.getHeaderNames() now returns 
unique names
e9ee933 is described below

commit e9ee9338f3b4c694b7fd90b69ed468dbdeff5a76
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Tue Feb 25 14:16:44 2020 +0000

    BZ 64166. HttpServletResponse.getHeaderNames() now returns unique names
    
    https://bz.apache.org/bugzilla/show_bug.cgi?id=64166
---
 java/org/apache/catalina/connector/Response.java | 7 ++++---
 webapps/docs/changelog.xml                       | 4 ++++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/java/org/apache/catalina/connector/Response.java 
b/java/org/apache/catalina/connector/Response.java
index fce5570..9ec0b5d 100644
--- a/java/org/apache/catalina/connector/Response.java
+++ b/java/org/apache/catalina/connector/Response.java
@@ -30,9 +30,11 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Enumeration;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Set;
 import java.util.function.Supplier;
 
 import jakarta.servlet.ServletOutputStream;
@@ -868,9 +870,8 @@ public class Response implements HttpServletResponse {
 
     @Override
     public Collection<String> getHeaders(String name) {
-        Enumeration<String> enumeration =
-                getCoyoteResponse().getMimeHeaders().values(name);
-        List<String> result = new ArrayList<>();
+        Enumeration<String> enumeration = 
getCoyoteResponse().getMimeHeaders().values(name);
+        Set<String> result = new LinkedHashSet<>();
         while (enumeration.hasMoreElements()) {
             result.add(enumeration.nextElement());
         }
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 5632768..dd93f38 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -59,6 +59,10 @@
         Add extension point to DeltaSession to improve subclassing.
         Patch provided by ThStock. (schultz)
       </add>
+      <fix>
+        <bug>64166</bug>: Ensure that the names returned by
+        <code>HttpServletResponse.getHeaderNames()</code> are unique. (markt)
+      </fix>
     </changelog>
   </subsection>
   <subsection name="Coyote">


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