Correct the response URI and add content type and encoding

UnitTests/DataAssemblyTest.cs

@@ -37,8 +37,8 @@ public void LookupRddl()
                 */
             Assert.NotNull(res);
             Assert.NotNull(res.Stream);
-            Assert.NotNull(res.Uri);
-            Assert.That(res.Uri.Scheme == "pack");
+            Assert.NotNull(res.ResolvedUri);
+            Assert.That(res.ResolvedUri.Scheme == "pack");
         }
 
         /*

UnitTests/ResolverTest.cs

@@ -51,7 +51,7 @@ public void LookupSystem() {
                 IResourceResponse rsrc = resolver.ResolveEntity(null, null, "https://example.com/sample/1.0/sample.dtd", null);
 
                 Assert.NotNull(rsrc.Stream);
-                Assert.AreEqual(result, rsrc.Uri);
+                Assert.AreEqual(result, rsrc.ResolvedUri);
             } catch (Exception ex) {
                 Console.WriteLine(ex.Message);
                 Assert.Fail();
@@ -63,9 +63,38 @@ public void LookupSystemAsUri() {
             try {
                 Uri result = UriUtils.Resolve(TEST_ROOT_DIRECTORY, "UnitTests/resources/sample10/sample.dtd");
                 IResourceResponse rsrc = resolver.ResolveEntity(null, null, "https://example.com/sample/1.0/uri.dtd", null);
+                Assert.NotNull(rsrc.Stream);
+                Assert.AreEqual(result, rsrc.ResolvedUri);
+            } catch (Exception) {
+                Assert.Fail();
+            }
+        }
 
+        [Test]
+        public void LookupUri() {
+            try
+            {
+                IResourceResponse rsrc = resolver.ResolveUri("XMLSchema.xsd", "http://www.w3.org/TR/xmlschema11-1/");
+                Assert.NotNull(rsrc.Uri);
+                Assert.NotNull(rsrc.ResolvedUri);
+                Assert.NotNull(rsrc.Stream);
+
+                Assert.AreEqual(new Uri("http://www.w3.org/TR/xmlschema11-1/XMLSchema.xsd"), rsrc.Uri);
+                Assert.AreEqual("pack", rsrc.ResolvedUri.Scheme);
+            } catch (Exception) {
+                Assert.Fail();
+            }
+        }
+
+        [Test]
+        public void LookupRedirectedUri() {
+            try
+            {
+                IResourceResponse rsrc = resolver.ResolveUri("https://www.w3.org/TR/1999/WD-font-19990902");
+                Assert.NotNull(rsrc.Uri);
+                Assert.NotNull(rsrc.ResolvedUri);
                 Assert.NotNull(rsrc.Stream);
-                Assert.AreEqual(result, rsrc.Uri);
+                Assert.NotNull(rsrc.Encoding);
             } catch (Exception) {
                 Assert.Fail();
             }

XmlResolver/ResourceAccess.cs

@@ -166,6 +166,19 @@ private static IResourceResponse _getHttpResource(IResourceRequest request, Uri
         }
 
         var rsrc = new ResourceResponse(request, resolvedUri);
+
+        var pos = ctype.IndexOf("charset=", StringComparison.Ordinal);
+        if (pos > 0)
+        {
+            var charset = ctype.Substring(pos + 8);
+            pos = charset.IndexOf(";", StringComparison.Ordinal);
+            if (pos > 0)
+            {
+                charset = charset.Substring(0, pos);
+            }
+            rsrc.Encoding = charset;
+        }
+        rsrc.ContentType = ctype;
         rsrc.SetHeaders(headers);
         rsrc.Stream = resp.Content.ReadAsStream();
         rsrc.StatusCode = 200;
@@ -219,13 +232,13 @@ private static (Uri resolvedUri, HttpResponseMessage resp) _getHttpResponse(Uri
 
         throw CreateHttpRequestException("Failed to read resource", status);
 
-        HttpRequestException CreateHttpRequestException(string text, HttpStatusCode statusCode)
-        {
-#if NETSTANDARD2_0
-            return new HttpRequestException($"{text} ({statusCode})");
-#else
-            return new HttpRequestException(text, null, statusCode);
-#endif
+        HttpRequestException CreateHttpRequestException(string text, HttpStatusCode statusCode)
+        {
+#if NETSTANDARD2_0
+            return new HttpRequestException($"{text} ({statusCode})");
+#else
+            return new HttpRequestException(text, null, statusCode);
+#endif
         }
     }
 

XmlResolver/ResourceResponse.cs

@@ -15,7 +15,7 @@ internal ResourceResponse(IResourceRequest request, Uri? uri = null)
     {
         Request = request;
         Rejected = false;
-        Uri = uri;
+        Uri = request.GetAbsoluteUri();
         ResolvedUri = uri;
         Resolved = uri != null;
     }