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# Loopback
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Loopback 是个出站数据协议，其作用为将经该出站传出的数据重新送入路由入站，以达到数据无需离开 Xray-core 即可再次被路由处理的效果。
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## OutboundConfigurationObject
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```json
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{
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"inboundTag": "TagUseAsInbound"
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}
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```
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> `inboundTag`: string
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用于重新路由的入站协议标识。
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该标识可以在路由中用于 `inboundTag` ，表示该出站中的数据可以被对应的路由规则再次处理。
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### 如何使用？
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如果需要将已经通过路由规则分流过的流量再由其它路由规则做更细致的分流，比如由同一组路由规则分流后的 TCP 流量和 UDP 要走不同的出站，则可以使用 `loopback` 出站完成。
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``` json
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{
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"outbounds": [
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{
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"protocol": "loopback",
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"tag": "need-to-split",
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"settings": {
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"inboundTag": "traffic-input" // 该 tag 在下方用于 RuleObject 的 inboundTag
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}
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},
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{
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"tag": "tcp-output",
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// protocol, settings, streamSettings 之类的设置
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},
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{
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"tag": "udp-output",
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// protocol, settings, streamSettings 之类的设置
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}
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],
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"routing": {
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"rules": [
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{
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"inboundTag": ["traffic-input"], // loopback 设定的 tag
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"network": "tcp",
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"outboundTag": "tcp-output"
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},
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{
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"inboundTag": ["traffic-input"], // loopback 设定的 tag
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"network": "udp",
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"outboundTag": "udp-output"
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}
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]
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}
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}
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```
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