asp.net Exclude OPTIONS request && sample asp.net skywalking.json (#118)

sample/SkyWalking.Sample.AspNet/SkyWalking.Sample.AspNet.csproj

@@ -118,6 +118,9 @@
       <Name>SkyWalking.AspNet</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="skywalking.json" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="..\..\packages\Grpc.Core.1.12.0\build\net45\Grpc.Core.targets" Condition="Exists('..\..\packages\Grpc.Core.1.12.0\build\net45\Grpc.Core.targets')" />
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">

sample/SkyWalking.Sample.AspNet/Web.config

@@ -7,10 +7,6 @@ http://www.mono-project.com/Config_system.web and
 http://msdn2.microsoft.com/en-us/library/b5ysx397.aspx
 -->
 <configuration>
-  <appSettings>
-    <add key="ApplicationCode" value="aspnet-sample"/>
-    <add key="DirectServers" value="localhost:11800"/>
-   </appSettings>
   <system.web>
     <compilation debug="true" targetFramework="4.5">
       <assemblies />

sample/SkyWalking.Sample.AspNet/skywalking.json

+{
+  "SkyWalking": {
+    "ApplicationCode": "SkyWalking.Sample.AspNet",
+    "SpanLimitPerSegment": 300,
+    "Sampling": {
+      "SamplePer3Secs": -1
+    },
+    "Logging": {
+      "Level": "Information",
+      "FilePath": "logs\\SkyWalking-{Date}.log"
+    },
+    "Transport": {
+      "Interval": 3000,
+      "PendingSegmentLimit": 30000,
+      "PendingSegmentTimeout": 1000,
+      "gRPC": {
+        "Servers": "localhost:11800",
+        "Timeout": 2000,
+        "ConnectTimeout": 10000
+      }
+    }
+  }
+}
\ No newline at end of file

src/SkyWalking.AspNet/SkyWalkingApplicationRequestCallback.cs

@@ -42,6 +42,13 @@ namespace SkyWalking.AspNet
         {
             var httpApplication = sender as HttpApplication;
             var httpContext = httpApplication.Context;
+
+            if(httpContext.Request.HttpMethod == "OPTIONS")
+            {
+                //asp.net Exclude OPTIONS request
+                return;
+            }
+
             var carrier = _contextCarrierFactory.Create();
             foreach (var item in carrier.Items)
                 item.HeadValue = httpContext.Request.Headers[item.HeadKey];
@@ -60,15 +67,21 @@ namespace SkyWalking.AspNet
 
         public void ApplicationOnEndRequest(object sender, EventArgs e)
         {
+            var httpApplication = sender as HttpApplication;
+            var httpContext = httpApplication.Context;
+
+            if (httpContext.Request.HttpMethod == "OPTIONS")
+            {
+                //asp.net Exclude OPTIONS request
+                return;
+            }
+
             var httpRequestSpan = ContextManager.ActiveSpan;
             if (httpRequestSpan == null)
             {
                 return;
             }
 
-            var httpApplication = sender as HttpApplication;
-            var httpContext = httpApplication.Context;
-
             var statusCode = httpContext.Response.StatusCode;
             if (statusCode >= 400)
             {