solve compatible issue with dubbo 2.5.9, 2.5.10#2175

diecui1202 merged 1 commit intoapache:2.6.xapache/dubbo:2.6.xfrom

jasonjoo2010:protocol_fix_2.6.xjasonjoo2010/incubator-dubbo:protocol_fix_2.6.xCopy head branch name to clipboard