https://github.com/vthoang/cgminer
cgminer.c

static char *gbt_req = "{\"id\": 0, \"method\": \"getblocktemplate\", \"params\": [{\"capabilities\": [\"coinbasetxn\", \"workid\", \"coinbase/append\"]}]}\n";

static char *gbt_solo_req = "{\"id\": 0, \"method\": \"getblocktemplate\", \"params\": [{\"rules\" : [\"segwit\"]}]}\n";