Is there API for get a free TCP port as web server testing process?

[dlin]

I want to write a test program to test web server which register a free port.

But, when we Listening, we must provide a parameter e.g :6060.

Because port 6060 is occupied by godoc sometimes, I wish my  server_test.go will run as soon as possible.

So, I require to assign a free port number.

Any suggestion?

[Tamás Gulácsi]

Use 0 as port number.

[Jim Teeuwen]

Use Port 0. The operating system will then assign you a free one automatically.

You can see which one was chosen through Listener.Address(), after it has opened.

[dlin]

Thank you, 

In fact, 

In my test, not only the web server required a free port.

I required multiple clients assigned by local port number.

Is there API to get the free local port number for the clients to use?

At the first test, the test will pass.

At 2nd test, the client dialer Dial() to server will caused 'address already used' error.

And use 'netstat -tan | grep <port>' will see it is on TIME_WAIT state.

So, I think to let the auto test smooth is to get a free local port at first.

[lu dongping]

l,_ := net.Listen("tcp",":0")

defer l.Close()

println(l.Addr().String())

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[dlin]

Thanks, I just use "" empty string. And it works.