Accept Also http Status Code 3xx

[tranmh]

Hi,

I am kindly asking you to change the watchdog-tomcat.go code, so that it also accepts http status code 3xx instead of 200 only.

My change is as diff is:

diff --git a/watchdog-tomcat.go b/watchdog-tomcat.go
index d1b8612..cf792d3 100644
--- a/watchdog-tomcat.go
+++ b/watchdog-tomcat.go
@@ -72,13 +72,20 @@ func runWatchedApp(application string) (pid int, err error) {
 func healthCheck(check_url string, timeout time.Duration) (bool, error) {
     var netClient = &http.Client{
         Timeout: time.Second * timeout,
+        CheckRedirect: func(req *http.Request, via []*http.Request) error {
+            return http.ErrUseLastResponse
+        },
     }
     resp, err := netClient.Get(check_url)
     if err != nil {
         return false, err
     }
-    if resp.StatusCode != 200 {
-        return false, errors.New("health check status is not 200")
+    if resp.StatusCode == 200  {
+        return true, nil
+    } else if resp.StatusCode >= 300 && resp.StatusCode < 400 {
+        return true, nil
+    } else {
+        return false, errors.New("health check status is not 200 or 3xx")
     }
     defer resp.Body.Close()
     return true, nil
@@ -186,4 +193,4 @@ func main() {
         }
     }(check_url)
     wg.Wait()
}

I followed this post for making the change.
https://stackoverflow.com/questions/23297520/how-can-i-make-the-go-http-client-not-follow-redirects-automatically

It would be nice, if you can put my change to branch master.

Thx.