Add an option to log unsupported route

src/Libraries/Microsoft.AspNetCore.Diagnostics.Middleware/Logging/HttpLoggingRedactionInterceptor.cs

@@ -33,6 +33,7 @@ internal sealed class HttpLoggingRedactionInterceptor : IHttpLoggingInterceptor
     private readonly HeaderReader _responseHeadersReader;
     private readonly string[] _excludePathStartsWith;
     private readonly FrozenDictionary<string, DataClassification> _parametersToRedactMap;
+    private readonly bool _includeUnmatchedRoutes;
 
     public HttpLoggingRedactionInterceptor(
         IOptions<LoggingRedactionOptions> options,
@@ -59,6 +60,7 @@ public HttpLoggingRedactionInterceptor(
         _responseHeadersReader = new(optionsValue.ResponseHeadersDataClasses, redactorProvider, HttpLoggingTagNames.ResponseHeaderPrefix);
 
         _excludePathStartsWith = optionsValue.ExcludePathStartsWith.ToArray();
+        _includeUnmatchedRoutes = optionsValue.IncludeUnmatchedRoutes;
     }
 
     public ValueTask OnRequestAsync(HttpLoggingInterceptorContext logContext)
@@ -115,6 +117,10 @@ public ValueTask OnRequestAsync(HttpLoggingInterceptorContext logContext)
                         }
                     }
                 }
+                else if (_includeUnmatchedRoutes)
+                {
+                    path = context.Request.Path.ToString();
+                }
             }
             else if (request.Path.HasValue)
             {

src/Libraries/Microsoft.AspNetCore.Diagnostics.Middleware/Logging/LoggingRedactionOptions.cs

@@ -100,6 +100,17 @@ public class LoggingRedactionOptions
 #pragma warning disable CA2227 // Collection properties should be read only
     public ISet<string> ExcludePathStartsWith { get; set; } = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
 #pragma warning restore CA2227 // Collection properties should be read only
+
+    /// <summary>
+    /// Gets or sets a value indicating whether to report unmatched routes.
+    /// </summary>
+    /// <remarks>
+    /// If set to true, instead of logging <i>unknown</i> value for path attribute it will log whole path of routes not identified by ASP.NET Routing.
+    /// </remarks>
+    /// <value>Defaults to <see langword="true"/>.</value>
+#pragma warning disable CA1805 // Do not initialize unnecessarily
+    public bool IncludeUnmatchedRoutes { get; set; } = false;
+#pragma warning restore CA1805 // Do not initialize unnecessarily
 }
 
 #endif

test/Libraries/Microsoft.AspNetCore.Diagnostics.Middleware.Tests/Logging/AcceptanceTests.cs

@@ -230,7 +230,7 @@
                 const string Content = "Client: hello!";
 
                 using var content = new StringContent(Content, null, requestContentType);
-                using var response = await client.PostAsync("/", content).ConfigureAwait(false);
+                using var response = await client.PostAsync("/myroute/123", content).ConfigureAwait(false);
                 Assert.True(response.IsSuccessStatusCode);
 
                 await WaitForLogRecordsAsync(logCollector, _defaultLogTimeout);
@@ -267,6 +267,49 @@
             });
     }
 
+    [Fact]
+    public async Task HttpLogging_WhenIncludeUnmatchedRoutes_LogRequestPath()
+    {
+        await RunAsync(
+            LogLevel.Information,
+            services => services.AddHttpLogging(x =>
+            {
+                x.MediaTypeOptions.Clear();
+                x.MediaTypeOptions.AddText("text/*");
+                x.LoggingFields |= HttpLoggingFields.RequestBody;
+            }).AddHttpLoggingRedaction(options => options.IncludeUnmatchedRoutes = true),
+            async (logCollector, client) =>
+            {
+                const string Content = "Client: hello!";
+
+                using var content = new StringContent(Content, null, MediaTypeNames.Text.Html);
+                using var response = await client.PostAsync("/myroute/123", content).ConfigureAwait(false);
+                Assert.True(response.IsSuccessStatusCode);
+
+                await WaitForLogRecordsAsync(logCollector, _defaultLogTimeout);
+
+                Assert.Equal(1, logCollector.Count);
+                Assert.Null(logCollector.LatestRecord.Exception);
+                Assert.Equal(LogLevel.Information, logCollector.LatestRecord.Level);
+                Assert.Equal(LoggingCategory, logCollector.LatestRecord.Category);
+
+                var responseStatus = ((int)response.StatusCode).ToInvariantString();
+                var state = logCollector.LatestRecord.StructuredState!;
+
+                Assert.DoesNotContain(state, x => x.Key == HttpLoggingTagNames.ResponseBody);
+                Assert.DoesNotContain(state, x => x.Key.StartsWith(HttpLoggingTagNames.RequestHeaderPrefix));
+                Assert.DoesNotContain(state, x => x.Key.StartsWith(HttpLoggingTagNames.ResponseHeaderPrefix));
+                Assert.Single(state, x => x.Key == HttpLoggingTagNames.Host && !string.IsNullOrEmpty(x.Value));
+                Assert.Single(state, x => x.Key == HttpLoggingTagNames.Path && x.Value == "/myroute/123");
+                Assert.Single(state, x => x.Key == HttpLoggingTagNames.StatusCode && x.Value == responseStatus);
+                Assert.Single(state, x => x.Key == HttpLoggingTagNames.Method && x.Value == HttpMethod.Post.ToString());
+                Assert.Single(state, x => x.Key == HttpLoggingTagNames.Duration &&
+                    x.Value != null &&
+                    int.Parse(x.Value, CultureInfo.InvariantCulture) == SlashRouteProcessingTimeMs);
+            });
+    }
+
+
     [Fact]
     public async Task HttpLogging_WhenLogLevelInfo_LogRequestStart()
     {