Solution : https://service.sap.com/sap/support/notes/1343993 (SAP Service marketplace login required)
Key words : 
java virtual machine heap size, maximum heap size       512mbyte, default maximum heap space, block chunked    http requests, java virtual machine, initial heap size, java heap space, chunked http request, compressed http requests, java control panel
Related Notes : 
       
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace |