lowerCaseHeader := make(map[string]string, len(attrs.NexusHeader))
for k, v := range attrs.NexusHeader {
lowerCaseHeader[lowerK] = v
headerLength += len(lowerK) + len(v)
if slices.Contains(ch.config.DisallowedOperationHeaders(), lowerK) {
return FailWorkflowTaskError{
Cause: enumspb.WORKFLOW_TASK_FAILED_CAUSE_BAD_SCHEDULE_NEXUS_OPERATION_ATTRIBUTES,