code: public String lookupHttpCrossDomain(String httpsDomainName) {
  		Iterator iter = crossDomainMappings.keySet().iterator();
  
          while (iter.hasNext()) {
          	String httpDomainName = (String) iter.next();
  
              if (crossDomainMappings.get(httpDomainName).equals(httpsDomainName)) {
                  return httpDomainName;
              }
          }
  
          return null;
  	}
docs: returns the HTTP domain Name