public void setHeaders(Map<String, String> headers) {
        this.headers = new HashMap<>(headers.size());
        for(Map.Entry<String, String> entry : headers.entrySet()) {
            this.headers.put(entry.getKey(), entry.getValue());
        }
    }
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