diff --git a/MangaRipper.Core/Downloader.cs b/MangaRipper.Core/Downloader.cs
index 4e634fa..12c0a8f 100644
--- a/MangaRipper.Core/Downloader.cs
+++ b/MangaRipper.Core/Downloader.cs
@@ -21,7 +21,6 @@ private HttpWebRequest CreateRequest(string url)
             HttpWebRequest request = WebRequest.CreateHttp(uri);
             request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
             request.Credentials = CredentialCache.DefaultCredentials;
-            request.Referer = uri.AbsoluteUri;
             return request;
         }
 
diff --git a/MangaRipper.Core/IMangaService.cs b/MangaRipper.Core/IMangaService.cs
index 7b3054d..acbb052 100644
--- a/MangaRipper.Core/IMangaService.cs
+++ b/MangaRipper.Core/IMangaService.cs
@@ -7,6 +7,9 @@
 
 namespace MangaRipper.Core
 {
+    /// <summary>
+    /// We have many manga services, each service support downloading from one site.
+    /// </summary>
     public interface IMangaService
     {
         SiteInformation GetInformation();
diff --git a/MangaRipper.Core/Worker.cs b/MangaRipper.Core/Worker.cs
index 03d3ff3..ac7adce 100644
--- a/MangaRipper.Core/Worker.cs
+++ b/MangaRipper.Core/Worker.cs
@@ -87,7 +87,7 @@ private async Task DownloadChapterInternal(Chapter chapter, string mangaLocalPat
             // create folder to keep images
             var downloader = new Downloader();
             var folderName = chapter.Name.RemoveFileNameInvalidChar();
-            var destinationPath = Path.Combine(mangaLocalPath, folderName); ;
+            var destinationPath = Path.Combine(mangaLocalPath, folderName);
             Directory.CreateDirectory(destinationPath);
             // download images
             int countImage = 0;
diff --git a/MangaRipper.Test/UnitTest.cs b/MangaRipper.Test/UnitTest.cs
index c59ab58..0087d5a 100644
--- a/MangaRipper.Test/UnitTest.cs
+++ b/MangaRipper.Test/UnitTest.cs
@@ -42,6 +42,10 @@ public async Task MangaReader_Test()
             Assert.AreEqual("http://i10.mangareader.net/naruto/1/naruto-1564773.jpg", images[0]);
             Assert.AreEqual("http://i4.mangareader.net/naruto/1/naruto-1564774.jpg", images[1]);
             Assert.AreEqual("http://i1.mangareader.net/naruto/1/naruto-1564825.jpg", images[52]);
+
+            var downloader = new Downloader();
+            string imageString = await downloader.DownloadStringAsync(images[0]);
+            Assert.IsNotNull(imageString, "Cannot download image!");
         }
 
         [TestMethod]
@@ -61,6 +65,10 @@ public async Task MangaFox_Test()
             Assert.AreEqual("http://h.mfcdn.net/store/manga/19803/001.0/compressed/q001.jpg", images[0]);
             Assert.AreEqual("http://h.mfcdn.net/store/manga/19803/001.0/compressed/q002.jpg", images[1]);
             Assert.AreEqual("http://h.mfcdn.net/store/manga/19803/001.0/compressed/q015.jpg", images[14]);
+
+            var downloader = new Downloader();
+            string imageString = await downloader.DownloadStringAsync(images[0]);
+            Assert.IsNotNull(imageString, "Cannot download image!");
         }
 
         [TestMethod]
@@ -78,23 +86,31 @@ public async Task MangaHere_Test()
             Assert.AreEqual("http://h.mhcdn.net/store/manga/9275/001.0/compressed/m001.01.jpg", images[0]);
             Assert.AreEqual("http://h.mhcdn.net/store/manga/9275/001.0/compressed/m001.02.jpg", images[1]);
             Assert.AreEqual("http://h.mhcdn.net/store/manga/9275/001.0/compressed/m001.55.jpg", images[54]);
+
+            var downloader = new Downloader();
+            string imageString = await downloader.DownloadStringAsync(images[0]);
+            Assert.IsNotNull(imageString, "Cannot download image!");
         }
 
         [TestMethod]
         public async Task MangaShare_Test()
         {
-            string url = "http://read.mangashare.com/Beelzebub";
+            string url = "http://read.mangashare.com/Gantz";
             var service = Framework.GetService(url);
             var chapters = await service.FindChapters(url, new Progress<int>(), source.Token);
             Assert.IsTrue(chapters.Count > 0, "Cannot find chapters.");
             var chapter = chapters.Last();
-            Assert.AreEqual("Beelzebub 1", chapter.Name);
-            Assert.AreEqual("http://read.mangashare.com/Beelzebub/chapter-001/page001.html", chapter.Link);
+            Assert.AreEqual("Gantz 1", chapter.Name);
+            Assert.AreEqual("http://read.mangashare.com/Gantz/chapter-001/page001.html", chapter.Link);
             var images = await service.FindImanges(chapter, new Progress<int>(), source.Token);
-            Assert.AreEqual(58, images.Count);
-            Assert.AreEqual("http://dl01.mangashare.com/manga/Beelzebub/001/001.jpg", images[0]);
-            Assert.AreEqual("http://dl01.mangashare.com/manga/Beelzebub/001/002.jpg", images[1]);
-            Assert.AreEqual("http://dl01.mangashare.com/manga/Beelzebub/001/058.jpg", images[57]);
+            Assert.AreEqual(43, images.Count);
+            Assert.AreEqual("http://dl01.mangashare.com/manga/Gantz/001/001.jpg", images[0]);
+            Assert.AreEqual("http://dl01.mangashare.com/manga/Gantz/001/002.jpg", images[1]);
+            Assert.AreEqual("http://dl01.mangashare.com/manga/Gantz/001/043.jpg", images[42]);
+
+            var downloader = new Downloader();
+            string imageString = await downloader.DownloadStringAsync(images[0]);
+            Assert.IsNotNull(imageString, "Cannot download image!");
         }
     }
 }