feat: update agent header and endpoint for gRPC web (#443)

* feat: use web prefix for endpoints when using gRPC-web

The domain for our HTTP/1.1 endpoints now has a "web." prefix. We
adjust the endpoints appropriately.

* feat: use appropriate agent header moniker when using gRPC-web

src/Momento.Sdk/Internal/ControlGrpcManager.cs

@@ -74,14 +74,24 @@ internal sealed class ControlGrpcManager : IDisposable
 {
     private readonly GrpcChannel channel;
     public IControlClient Client { get; }
-    private readonly string version = "dotnet:" + GetAssembly(typeof(Momento.Sdk.Responses.CacheGetResponse)).GetName().Version.ToString();
+
+#if USE_GRPC_WEB
+    private readonly static string moniker = "dotnet-web";
+#else
+    private readonly static string moniker = "dotnet";
+#endif
+    private readonly string version = $"{moniker}:{GetAssembly(typeof(Momento.Sdk.Responses.CacheGetResponse)).GetName().Version.ToString()}";
     // Some System.Environment.Version remarks to be aware of
     // https://learn.microsoft.com/en-us/dotnet/api/system.environment.version?view=netstandard-2.0#remarks
-    private readonly string runtimeVersion = "dotnet:" + System.Environment.Version;
+    private readonly string runtimeVersion = $"{moniker}:{System.Environment.Version}";
     private readonly ILogger _logger;
 
     public ControlGrpcManager(ILoggerFactory loggerFactory, string authToken, string endpoint)
     {
+#if USE_GRPC_WEB
+        // Note: all web SDK requests are routed to a `web.` subdomain to allow us flexibility on the server
+        endpoint = $"web.{endpoint}";
+#endif
         var uri = $"https://{endpoint}";
         this.channel = GrpcChannel.ForAddress(uri, new GrpcChannelOptions()
         {

src/Momento.Sdk/Internal/DataGrpcManager.cs

@@ -226,15 +226,24 @@ public class DataGrpcManager : IDisposable
 
     public readonly IDataClient Client;
 
-    private readonly string version = "dotnet:" + GetAssembly(typeof(Responses.CacheGetResponse)).GetName().Version.ToString();
+#if USE_GRPC_WEB
+    private readonly static string moniker = "dotnet-web";
+#else
+    private readonly static string moniker = "dotnet";
+#endif
+    private readonly string version = $"{moniker}:{GetAssembly(typeof(Responses.CacheGetResponse)).GetName().Version.ToString()}";
     // Some System.Environment.Version remarks to be aware of
     // https://learn.microsoft.com/en-us/dotnet/api/system.environment.version?view=netstandard-2.0#remarks
-    private readonly string runtimeVersion = "dotnet:" + Environment.Version;
+    private readonly string runtimeVersion = $"{moniker}:{Environment.Version}";
     private readonly ILogger _logger;
 
-    internal DataGrpcManager(IConfiguration config, string authToken, string host)
+    internal DataGrpcManager(IConfiguration config, string authToken, string endpoint)
     {
-        var url = $"https://{host}";
+#if USE_GRPC_WEB
+        // Note: all web SDK requests are routed to a `web.` subdomain to allow us flexibility on the server
+        endpoint = $"web.{endpoint}";
+#endif
+        var uri = $"https://{endpoint}";
         var channelOptions = config.TransportStrategy.GrpcConfig.GrpcChannelOptions;
         if (channelOptions.LoggerFactory == null)
         {
@@ -245,7 +254,7 @@ internal DataGrpcManager(IConfiguration config, string authToken, string host)
         channelOptions.HttpHandler = new GrpcWebHandler(new HttpClientHandler());
 #endif
 
-        this.channel = GrpcChannel.ForAddress(url, channelOptions);
+        this.channel = GrpcChannel.ForAddress(uri, channelOptions);
         List<Header> headers = new List<Header> { new Header(name: Header.AuthorizationKey, value: authToken), new Header(name: Header.AgentKey, value: version), new Header(name: Header.RuntimeVersionKey, value: runtimeVersion) };
 
         this._logger = config.LoggerFactory.CreateLogger<DataGrpcManager>();