tcp proxy requests, need more test.

lichao

2021-05-28 9243710ca372de26823c2225c7b46b072458c671

 src/exported_symbols

@@ -5,6 +5,7 @@
   BHUnregister;
   BHRegisterTopics;
   BHQueryTopicAddress;
   BHQueryProcs;
   BHSubscribeTopics;
   BHStartWorker;
   BHHeartbeatEasy;