server_read_http
void server_read_http(struct bufferevent *, void *);
clt->clt_bev = bufferevent_new(clt->clt_s, server_read_http,
server_read_http(clt->clt_bev, arg);
if (EVBUFFER_LENGTH(src) && bev->readcb != server_read_http)
bev->readcb = server_read_http;
bev->readcb = server_read_http;
clt->clt_bev->readcb = server_read_http;