diff --git
a/common/scala/src/main/scala/org/apache/openwhisk/http/BasicHttpService.scala
b/common/scala/src/main/scala/org/apache/openwhisk/http/BasicHttpService.scala
index d82591ab11..352be101e8 100644
---
a/common/scala/src/main/scala/org/apache/openwhisk/http/BasicHttpService.scala
+++
b/common/scala/src/main/scala/org/apache/openwhisk/http/BasicHttpService.scala
@@ -63,6 +63,7 @@ trait BasicHttpService extends Directives {
val prioritizeRejections = recoverRejections { rejections =>
val priorityRejection = rejections.find {
case rejection: UnacceptedResponseContentTypeRejection => true
+ case rejection: ValidationRejection => true
case _ => false
}
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