Fix for port in host

Author: darrelmiller

src/Microsoft.OpenApi.Readers/V2/OpenApiDocumentDeserializer.cs

@@ -153,12 +153,23 @@ private static void MakeServers(IList<OpenApiServer> servers, ParsingContext con
                     {
                         host = "//" + host;  // The double slash prefix creates a relative url where the scheme is defined by the BaseUrl
                     }
-
+                    int? port = null;
+                    if (host.Contains(":"))
+                    {
+                        var pieces = host.Split(':');
+                        host = pieces.First();
+                        port = int.Parse(pieces.Last());
+                    }
                     var uriBuilder = new UriBuilder(scheme, host)
                     {
                         Path = basePath
                     };
 
+                    if (port != null)
+                    {
+                        uriBuilder.Port = port.Value;
+                    }
+
                     var server = new OpenApiServer
                     {
                         Url = uriBuilder.ToString()

test/Microsoft.OpenApi.Readers.Tests/V2Tests/OpenApiServerTests.cs

@@ -235,5 +235,27 @@ public void MultipleServers()
             Assert.Equal("https://dev.bing.com/api", doc.Servers.Last().Url);
         }
 
+        [Fact]
+        public void LocalHostWithCustomHost()
+        {
+            var input = @"
+swagger: 2.0
+info: 
+  title: test
+  version: 1.0.0
+host: localhost:23232
+paths: {}
+";
+            var reader = new OpenApiStringReader(new OpenApiReaderSettings()
+            {
+                BaseUrl = new Uri("https://bing.com")
+            });
+
+            var doc = reader.Read(input, out var diagnostic);
+
+            var server = doc.Servers.First();
+            Assert.Equal(1, doc.Servers.Count);
+            Assert.Equal("https://localhost:23232", server.Url);
+        }
     }
 }