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# TCP
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TCP 传输模式是目前推荐使用的传输模式之一.
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可以和各种协议有多种组合模式.
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## TcpObject
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`TcpObject` 对应传输配置的 `tcpSettings` 项。
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```json
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{
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"acceptProxyProtocol": false,
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"header": {
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"type": "none"
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}
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}
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```
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> `acceptProxyProtocol`: true | false
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仅用于 inbound，指示是否接收 PROXY protocol。
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[PROXY protocol](https://www.haproxy.org/download/2.2/doc/proxy-protocol.txt) 专用于传递请求的真实来源 IP 和端口，**若你不了解它，请先忽略该项**。
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常见的反代软件（如 HAProxy、Nginx）都可以配置发送它，VLESS fallbacks xver 也可以发送它。
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填写 `true` 时，最底层 TCP 连接建立后，请求方必须先发送 PROXY protocol v1 或 v2，否则连接会被关闭。
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默认值为 `false`。
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> `header`: [NoneHeaderObject](#noneheaderobject) | [HttpHeaderobject](#httpheaderobject)
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数据包头部伪装设置，默认值为 `NoneHeaderObject`。
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::: tip
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HTTP 伪装无法被其它 HTTP 服务器（如 Nginx）分流，但可以被 VLESS fallbacks path 分流。
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:::
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### NoneHeaderObject
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不进行伪装
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```json
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{
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"type": "none"
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}
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```
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> `type`: "none"
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指定不进行伪装
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### HttpHeaderObject
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HTTP 伪装配置必须在对应的入站出站连接上同时配置，且内容必须一致。
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```json
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{
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"type": "http",
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"request": {},
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"response": {}
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}
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```
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> `type`: "http"
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指定进行 HTTP 伪装
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> `request`: [HTTPRequestObject](#httprequestobject)
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HTTP 请求
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> `response`: [HTTPResponseObject](#httpresponseobject)
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HTTP 响应
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#### HTTPRequestObject
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```json
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{
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"version": "1.1",
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"method": "GET",
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"path": ["/"],
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"headers": {
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"Host": ["www.baidu.com", "www.bing.com"],
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"User-Agent": [
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"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36",
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"Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_2 like Mac OS X) AppleWebKit/601.1 (KHTML, like Gecko) CriOS/53.0.2785.109 Mobile/14A456 Safari/601.1.46"
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],
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"Accept-Encoding": ["gzip, deflate"],
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"Connection": ["keep-alive"],
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"Pragma": "no-cache"
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}
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}
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```
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> `version`: string
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HTTP 版本，默认值为 `"1.1"`。
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> `method`: string
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HTTP 方法，默认值为 `"GET"`。
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> `path`: \[ string \]
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路径，一个字符串数组。默认值为 `["/"]`。当有多个值时，每次请求随机选择一个值。
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> `headers`: map{ string, \[ string \]}
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HTTP 头，一个键值对，每个键表示一个 HTTP 头的名称，对应的值是一个数组。
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每次请求会附上所有的键，并随机选择一个对应的值。默认值见上方示例。
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#### HTTPResponseObject
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```json
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{
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"version": "1.1",
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"status": "200",
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"reason": "OK",
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"headers": {
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"Content-Type": ["application/octet-stream", "video/mpeg"],
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"Transfer-Encoding": ["chunked"],
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"Connection": ["keep-alive"],
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"Pragma": "no-cache"
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}
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}
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```
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> `version`: string
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HTTP 版本，默认值为 `"1.1"`。
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> `status`: string
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HTTP 状态，默认值为 `"200"`。
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> `reason`: string
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HTTP 状态说明，默认值为 `"OK"`。
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> `headers`: map {string, \[ string \]}
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HTTP 头，一个键值对，每个键表示一个 HTTP 头的名称，对应的值是一个数组。
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每次请求会附上所有的键，并随机选择一个对应的值。默认值见上方示例。
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