1 files changed, 80 insertions, 2 deletions
diff --git a/MediaBrowser.Model/Dlna/DefaultLocalPlayer.cs b/MediaBrowser.Model/Dlna/DefaultLocalPlayer.cs
index fc15a55a0..4092046e2 100644
--- a/MediaBrowser.Model/Dlna/DefaultLocalPlayer.cs
+++ b/MediaBrowser.Model/Dlna/DefaultLocalPlayer.cs
@@ -1,4 +1,7 @@
-using System.IO;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
 
 namespace MediaBrowser.Model.Dlna
 {
@@ -16,7 +19,82 @@ namespace MediaBrowser.Model.Dlna
 
         public virtual bool CanAccessUrl(string url, bool requiresCustomRequestHeaders)
         {
-            return false;
+            if (requiresCustomRequestHeaders)
+            {
+                return false;
+            }
+
+            return CanAccessUrl(url);
+        }
+
+        private readonly Dictionary<string, TestResult> _results = new Dictionary<string, TestResult>(StringComparer.OrdinalIgnoreCase);
+        private readonly object _resultLock = new object();
+
+        private bool CanAccessUrl(string url)
+        {
+            var key = GetHostFromUrl(url);
+            lock (_resultLock)
+            {
+                TestResult result;
+                if (_results.TryGetValue(url, out result))
+                {
+                    var timespan = DateTime.UtcNow - result.Date;
+                    if (timespan <= TimeSpan.FromMinutes(3))
+                    {
+                        return result.Success;
+                    }
+                }
+            }
+
+            var canAccess = CanAccessUrlInternal(url);
+            lock (_resultLock)
+            {
+                _results[key] = new TestResult
+                {
+                    Success = canAccess,
+                    Date = DateTime.UtcNow
+                };
+            }
+            return canAccess;
+        }
+        
+        private bool CanAccessUrlInternal(string url)
+        {
+            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
+            request.Timeout = 5000;
+            request.Method = "HEAD"; 
+            try
+            {
+                using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
+                {
+                    return response.StatusCode == HttpStatusCode.OK;
+                }
+            }
+            catch (WebException)
+            {
+                return false;
+            }
+        }
+
+        protected void ClearUrlTestResultCache()
+        {
+            lock (_resultLock)
+            {
+                _results.Clear();
+            }
+        }
+
+        private string GetHostFromUrl(string url)
+        {
+            var start = url.IndexOf("://", StringComparison.OrdinalIgnoreCase) + 3;
+            var len = url.IndexOf('/', start) - start;
+            return url.Substring(start, len);
+        }
+
+        private class TestResult
+        {
+            public bool Success;
+            public DateTime Date;
         }
     }
 }