diff --git a/repository/Zinc-Seaside.package/ZnZincServerAdaptor.class/instance/requestHeadersFor..st b/repository/Zinc-Seaside.package/ZnZincServerAdaptor.class/instance/requestHeadersFor..st
index c174a0f70..b667a66d9 100644
--- a/repository/Zinc-Seaside.package/ZnZincServerAdaptor.class/instance/requestHeadersFor..st
+++ b/repository/Zinc-Seaside.package/ZnZincServerAdaptor.class/instance/requestHeadersFor..st
@@ -3,5 +3,10 @@ requestHeadersFor: aZincRequest
 	| fields |
 	fields := Dictionary new.
 	aZincRequest headersDo: [ :key :value |
-		fields at: key asLowercase put: value ].
+		| keyLowercase combinedValue |
+		keyLowercase := key asLowercase.
+		combinedValue := fields at: keyLowercase
+			ifPresent: [ :presentValue | presentValue , ',' , value ]
+			ifAbsent: [ value ].
+		fields at: keyLowercase put: combinedValue ].
 	^ fields
\ No newline at end of file