Fix TCK failure in getHeaders test

jaxrs-tck/src/main/java/ee/jakarta/tck/ws/rs/ee/rs/container/requestcontext/JAXRSClientIT.java

diff --git a/jaxrs-tck/src/main/java/ee/jakarta/tck/ws/rs/ee/rs/container/requestcontext/JAXRSClientIT.java b/jaxrs-tck/src/main/java/ee/jakarta/tck/ws/rs/ee/rs/container/requestcontext/JAXRSClientIT.java
index 4b215b6..8060d3d 100644
--- a/jaxrs-tck/src/main/java/ee/jakarta/tck/ws/rs/ee/rs/container/requestcontext/JAXRSClientIT.java
+++ b/jaxrs-tck/src/main/java/ee/jakarta/tck/ws/rs/ee/rs/container/requestcontext/JAXRSClientIT.java
@@ -351,7 +351,7 @@
       setProperty(Property.REQUEST_HEADERS,
               "Content-Type:application/xml;charset=utf8");
       setProperty(Property.REQUEST_HEADERS,
-              "Header3:value1 ;; Value2 ;;value 3");
+              "header3:value1 ;; Value2 ;;value 3");
       setProperty(Property.SEARCH_STRING, "Test1");
       setProperty(Property.SEARCH_STRING, "Test2");
       setProperty(Property.SEARCH_STRING, "Test3");