code: public static base_responses update(nitro_service client, policyhttpcallout resources[]) throws Exception {
  		base_responses result = null;
  		if (resources != null && resources.length > 0) {
  			policyhttpcallout updateresources[] = new policyhttpcallout[resources.length];
  			for (int i=0;i<resources.length;i++){
  				updateresources[i] = new policyhttpcallout();
  				updateresources[i].name = resources[i].name;
  				updateresources[i].ipaddress = resources[i].ipaddress;
  				updateresources[i].port = resources[i].port;
  				updateresources[i].vserver = resources[i].vserver;
  				updateresources[i].returntype = resources[i].returntype;
  				updateresources[i].httpmethod = resources[i].httpmethod;
  				updateresources[i].hostexpr = resources[i].hostexpr;
  				updateresources[i].urlstemexpr = resources[i].urlstemexpr;
  				updateresources[i].headers = resources[i].headers;
  				updateresources[i].parameters = resources[i].parameters;
  				updateresources[i].bodyexpr = resources[i].bodyexpr;
  				updateresources[i].fullreqexpr = resources[i].fullreqexpr;
  				updateresources[i].scheme = resources[i].scheme;
  				updateresources[i].resultexpr = resources[i].resultexpr;
  				updateresources[i].cacheforsecs = resources[i].cacheforsecs;
  			}
  			result = update_bulk_request(client, updateresources);
  		}
  		return result;
  	}
docs: Use this API to update policyhttpcallout resources.