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slice bounds out of range [:16] with capacity 0 #41

@certaintls

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@certaintls

When I followed the documentation to start the dispatcher with shadow, there was no error on the server side, after

./shapeshifter-dispatcher -transparent -server -state state -target 127.0.0.1:3333 -transports shadow -bindaddr shadow-127.0.0.1:2222 -optionsFile ConfigFiles/shadowServer.json -logLevel DEBUG -enableLogging
shadow listening on 127.0.0.1:2222

But, when I got error on the client side

./shapeshifter-dispatcher -transparent -client -state state -transports shadow -proxylistenaddr 127.0.0.1:9999 -optionsFile ConfigFiles/shadowClient.json -logLevel DEBUG -enableLogging
Dialing 
panic: runtime error: slice bounds out of range [:16] with capacity 0

goroutine 5 [running]:
github.com/OperatorFoundation/go-shadowsocks2/darkstar.getServerIdentifier({0xc00001a210?, 0xc000020100?}, 0x8ae)
	/go/pkg/mod/github.com/!operator!foundation/go-shadowsocks2@v1.1.7/darkstar/client.go:198 +0xca
github.com/OperatorFoundation/go-shadowsocks2/darkstar.NewDarkStarClient({0xc000020100?, 0x4?}, {0xc00001a210, 0xe}, 0x0?)
	/go/pkg/mod/github.com/!operator!foundation/go-shadowsocks2@v1.1.7/darkstar/client.go:36 +0xc5
github.com/OperatorFoundation/Shadow-go/shadow/v3.(*Transport).Dial(0xc0001801b0)
	/go/pkg/mod/github.com/!operator!foundation/!shadow-go/shadow/v3@v3.0.4/shadow.go:150 +0x9f
github.com/OperatorFoundation/shapeshifter-dispatcher/modes/transparent_tcp.clientHandler({0x7fff735232ac, 0x6}, {0xc0000fa000, 0x95}, {0x67ded0, 0xc000010010}, 0x640e30?)
	/workspaces/shapeshifter-dispatcher/modes/transparent_tcp/transparent_tcp.go:82 +0x1c7
created by github.com/OperatorFoundation/shapeshifter-dispatcher/modes.clientAcceptLoop
	/workspaces/shapeshifter-dispatcher/modes/tcp_common.go:73 +0x212

The error message doesn't tell the end user what is wrong.

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