host candidate:本机物理网卡或逻辑网卡地址和端口
srflx candidate:全称Sever Reflexive Candidate,端发送Binding请求到STUN/TURN Server经过NAT时,NAT上分配的地址和端口
prflx candidate:全称Peer Reflexive Candidate,端发送Binding请求到对等端经过NAT时,NAT上分配的地址和端口
relay candidate:全称Relayed Candidate,端发送Allocate请求到TURN Server,由TURN server用于中继的地址和端口
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