[wasm] Download Symbols from microsoft symbol server

src/mono/wasm/debugger/BrowserDebugHost/Startup.cs

@@ -15,6 +15,7 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using Microsoft.Extensions.Primitives;
 
 namespace Microsoft.WebAssembly.Diagnostics
 {
@@ -138,7 +139,14 @@ async Task ConnectProxy(HttpContext context)
                     {
                         using var loggerFactory = LoggerFactory.Create(
                             builder => builder.AddConsole().AddFilter(null, LogLevel.Information));
-                        var proxy = new DebuggerProxy(loggerFactory);
+
+                        StringValues urlSymbolServerList;
+
+                        if (!context.Request.Query.TryGetValue("urlSymbolServer", out urlSymbolServerList))
+                            urlSymbolServerList += "http://msdl.microsoft.com/download/symbols";
+
+                        var proxy = new DebuggerProxy(loggerFactory, urlSymbolServerList);
+
                         var ideSocket = await context.WebSockets.AcceptWebSocketAsync();
 
                         await proxy.Run(endpoint, ideSocket);

src/mono/wasm/debugger/BrowserDebugHost/TestHarnessStartup.cs

@@ -19,6 +19,7 @@
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Newtonsoft.Json.Linq;
+using Microsoft.Extensions.Primitives;
 
 namespace Microsoft.WebAssembly.Diagnostics
 {
@@ -122,7 +123,10 @@ public async Task LaunchAndServe(ProcessStartInfo psi, HttpContext context, Func
 
                 using var loggerFactory = LoggerFactory.Create(
                     builder => builder.AddConsole().AddFilter(null, LogLevel.Information));
-                var proxy = new DebuggerProxy(loggerFactory);
+
+                StringValues urlSymbolServerList = new StringValues("http://msdl.microsoft.com/download/symbols");
+
+                var proxy = new DebuggerProxy(loggerFactory, urlSymbolServerList);
                 var browserUri = new Uri(con_str);
                 var ideSocket = await context.WebSockets.AcceptWebSocketAsync();
 

src/mono/wasm/debugger/BrowserDebugProxy/DebuggerProxy.cs

@@ -5,6 +5,7 @@
 using System.Net.WebSockets;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Primitives;
 
 namespace Microsoft.WebAssembly.Diagnostics
 {
@@ -16,9 +17,9 @@ public class DebuggerProxy
     {
         private readonly MonoProxy proxy;
 
-        public DebuggerProxy(ILoggerFactory loggerFactory)
+        public DebuggerProxy(ILoggerFactory loggerFactory, StringValues urlSymbolServerList)
         {
-            proxy = new MonoProxy(loggerFactory);
+            proxy = new MonoProxy(loggerFactory, urlSymbolServerList);
         }
 
         public Task Run(Uri browserUri, WebSocket ideSocket)

src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs

@@ -15,21 +15,22 @@
 using Mono.Cecil.Pdb;
 using Mono.Cecil;
 using System.Net.Http;
+using Microsoft.Extensions.Primitives;
 
 namespace Microsoft.WebAssembly.Diagnostics
 {
 
     internal class MonoProxy : DevToolsProxy
     {
-        List<string> urlSymbolServerList = new List<string> ();
+        StringValues urlSymbolServerList;
         static HttpClient client = new HttpClient();
         HashSet<SessionId> sessions = new HashSet<SessionId>();
         Dictionary<SessionId, ExecutionContext> contexts = new Dictionary<SessionId, ExecutionContext>();
 
-        public MonoProxy(ILoggerFactory loggerFactory, bool hideWebDriver = true) : base(loggerFactory) 
+        public MonoProxy(ILoggerFactory loggerFactory, StringValues urlSymbolServerList, bool hideWebDriver = true) : base(loggerFactory) 
         { 
-            this.hideWebDriver = hideWebDriver; 
-            urlSymbolServerList.Add("http://msdl.microsoft.com/download/symbols");
+            this.hideWebDriver = hideWebDriver;
+            this.urlSymbolServerList = urlSymbolServerList;
         }
 
         readonly bool hideWebDriver;
@@ -352,7 +353,7 @@ protected override async Task<bool> AcceptCommand(MessageId id, string method, J
                     {
                         string url = args["url"]?.Value<string>();
                         if (!String.IsNullOrEmpty(url) && !urlSymbolServerList.Contains(url))
-                            urlSymbolServerList.Add(url);
+                            urlSymbolServerList += url;
                         return true;
                     }
                 case "DotnetDebugger.getMethodLocation":