From 0d6d9361ac5abed30b1c026c7cb49eb0b74394da Mon Sep 17 00:00:00 2001
From: Viktor Kryshtal <33136089+Lightwood13@users.noreply.github.com>
Date: Wed, 15 Jul 2026 14:44:13 +0300
Subject: [PATCH] Cookie sync: Make SetuidHandler bidder lookup case
 insensitive (#4557)

---
 .../prebid/server/handler/SetuidHandler.java  |  6 ++++-
 .../server/handler/SetuidHandlerTest.java     | 23 +++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/prebid/server/handler/SetuidHandler.java b/src/main/java/org/prebid/server/handler/SetuidHandler.java
index 2a9d5f72836..fee674c7a7d 100644
--- a/src/main/java/org/prebid/server/handler/SetuidHandler.java
+++ b/src/main/java/org/prebid/server/handler/SetuidHandler.java
@@ -9,6 +9,7 @@
 import io.vertx.core.http.HttpServerRequest;
 import io.vertx.core.http.HttpServerResponse;
 import io.vertx.ext.web.RoutingContext;
+import org.apache.commons.collections4.map.CaseInsensitiveMap;
 import org.apache.commons.lang3.BooleanUtils;
 import org.apache.commons.lang3.ObjectUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -117,7 +118,10 @@ private static Map<String, Usersyncer> collectUsersyncers(BidderCatalog bidderCa
         validateUsersyncersDuplicates(bidderCatalog);
         return bidderCatalog.usersyncReadyBidders().stream()
                 .collect(Collectors.toMap(
-                        Function.identity(), bidder -> bidderCatalog.usersyncerByName(bidder).orElseThrow()));
+                        Function.identity(),
+                        bidder -> bidderCatalog.usersyncerByName(bidder).orElseThrow(),
+                        (_, b) -> b,
+                        CaseInsensitiveMap::new));
     }
 
     private static void validateUsersyncersDuplicates(BidderCatalog bidderCatalog) {
diff --git a/src/test/java/org/prebid/server/handler/SetuidHandlerTest.java b/src/test/java/org/prebid/server/handler/SetuidHandlerTest.java
index c31326f2109..08e983f67c8 100644
--- a/src/test/java/org/prebid/server/handler/SetuidHandlerTest.java
+++ b/src/test/java/org/prebid/server/handler/SetuidHandlerTest.java
@@ -494,6 +494,29 @@ public void shouldRespondWithCookieFromRequestParamWhenBidderAndCookieFamilyAreD
         verify(httpResponse).addCookie(equalToUidsCookie(updatedUidsCookie));
     }
 
+    @Test
+    public void shouldRespondWithCookieFromRequestParamWhenBidderCaseInRequestIsDifferent()
+            throws IOException {
+
+        // given
+        final UidsCookie uidsCookie = emptyUidsCookie();
+        final UidsCookie updatedUidsCookie = uidsCookie.updateUid(ADNXS, "J5VLCWQP-26-CWFT");
+
+        given(uidsCookieService.parseFromRequest(any(RoutingContext.class)))
+                .willReturn(uidsCookie);
+        given(uidsCookieService.updateUidsCookie(uidsCookie, ADNXS, "J5VLCWQP-26-CWFT"))
+                .willReturn(updated(updatedUidsCookie));
+
+        given(httpRequest.getParam("bidder")).willReturn("ApPnExUs");
+        given(httpRequest.getParam("uid")).willReturn("J5VLCWQP-26-CWFT");
+
+        // when
+        setuidHandler.handle(routingContext);
+
+        // then
+        verify(httpResponse).addCookie(equalToUidsCookie(updatedUidsCookie));
+    }
+
     @Test
     public void shouldSendPixelWhenFParamIsEqualToIWhenTypeIsIframe() throws JsonProcessingException {
         // given