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iOS支持设置https SNI的网络库 用swift源码修改来的，把网络库URLSession抽离出来了，使用的是swift的release/5.6版本，应该是比较安全的 依赖了CFURLSessionInterface库，也是Swift Foundation抽离的一个c库，主要功能是对libcurl的封装 libcurl是自己编译的7.80.0版本

使用方法，先找到host和ip，然后设置resolve到header中

let host = "" let ip = "" let resolve = "\(host):443:\(ip)" setValue(resolve, forHTTPHeaderField: "resolve")

也可以设置connectTo属性

let host = "" let ip = "" let connectTo = "\(host):443:\(ip):443" setValue(connectTo, forHTTPHeaderField: "connectTo")

这两个应该都可以支持sni功能，但哪个好用我也还没试，底下的代码为：

` func set(connectTo: String) { let list = _CurlStringList([connectTo]) try! CFURLSession_easy_setopt_ptr(rawHandle, CFURLSessionOptionCONNECT_TO, list.asUnsafeMutablePointer).asError() connectToList = list }

func set(resolve: String) {
    let list = _CurlStringList([resolve])
    try! CFURLSession_easy_setopt_ptr(rawHandle, CFURLSessionOptionRESOLVE, list.asUnsafeMutablePointer).asError()
    try! CFURLSession_easy_setopt_long(rawHandle, CFURLSessionOptionIPRESOLVE, 0).asError()
    resolveList = list
}`