Log binary data as a parameter #2860

samples/SampleApp/Startup.cs

@@ -66,6 +66,7 @@ namespace SampleApp
             var hostBuilder = new WebHostBuilder()
                 .ConfigureLogging((_, factory) =>
                 {
+                    factory.SetMinimumLevel(LogLevel.Debug);
                     factory.AddConsole();
                 })
                 .ConfigureAppConfiguration((hostingContext, config) =>

src/Kestrel.Core/Adapter/Internal/LoggingStream.cs

@@ -174,13 +174,16 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Adapter.Internal
                 builder.Append(" ");
             }
             builder.AppendLine();
+            builder.Append("{0}");
+
+            var rawDataBuilder = new StringBuilder();
             // Write the bytes as if they were ASCII
             for (int i = 0; i < buffer.Length; i++)
             {
-                builder.Append((char)buffer[i]);
+                rawDataBuilder.Append((char)buffer[i]);
             }
 
-            _logger.LogDebug(builder.ToString());
+            _logger.LogDebug(builder.ToString(), rawDataBuilder.ToString());
         }
 
         // The below APM methods call the underlying Read/WriteAsync methods which will still be logged.