Hi,
You can restore to default values in Java System Properties > Service > Http Provider:
https://help.sap.com/saphelp_nw73/helpdata/en/48/bdba8f50dd35bce10000000a42189d/frameset.htm
https://help.sap.com/saphelp_nw73/helpdata/en/47/b08e12542e3378e10000000a421937/content.htm
Regards,
Rajendra