Avoid call if headers are not ready yet.
Avoid call if headers are not ready yet.

IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service