public boolean isWriteFailed() {
        return writeFailed;
    }
This class aims to embody all the data related to a API response. The instance will contain
the response headers, code, message and body. The body will be persisted as a file in a temporary
folder

@author rubenrm1@gmail.com
gateway/engine/core/src/main/java/io/apiman/gateway/engine/impl/CachedResponse.java