Merge branch 'issue/6' into 'master'

Try again if TCP connection cannot be established

See merge request tpo/anti-censorship/emma!3

tests.go

@@ -9,6 +9,7 @@ import (
 	"net/url"
 	"strings"
 	"time"
+	"os"
 )
 
 // timeout specifies the number of seconds we're willing to wait until we
@@ -44,10 +45,14 @@ func IsTCPPortReachable(addrTuple string) (r Result) {
 	r.Target = addrTuple
 
 	conn, err := net.DialTimeout("tcp", addrTuple, timeout)
+	if os.IsTimeout(err) {
+		conn, err = net.DialTimeout("tcp", addrTuple, timeout)
+	}
 	if err != nil {
 		r.Error = err
 		return
 	}
+    
 	conn.Close()
 	r.Error = nil
 	return