Longest match test

Author: Tratcher

src/Servers/HttpSys/src/UrlPrefixCollection.cs

@@ -73,6 +73,8 @@ internal bool TryMatchLongestPrefix(bool isHttps, string host, string originalPa
             {
                 foreach (var prefix in _prefixes.Values)
                 {
+                    // The scheme, host, port, and start of path must match.
+                    // Note this does not currently handle prefixes with wildcard subdomains.
                     if (isHttps == prefix.IsHttps
                         && string.Equals(host, prefix.HostAndPort, StringComparison.OrdinalIgnoreCase)
                         && originalPathString.StartsWithSegments(new PathString(prefix.PathWithoutTrailingSlash), StringComparison.OrdinalIgnoreCase, out var remainder)

src/Servers/HttpSys/test/FunctionalTests/Listener/ServerOnExistingQueueTests.cs

@@ -144,6 +144,26 @@ public async Task Server_PathSplitting(string pathBase, string requestPath, stri
             Assert.Equal(string.Empty, response);
         }
 
+        [ConditionalFact]
+        public async Task Server_LongestPathSplitting()
+        {
+            using var baseServer = Utilities.CreateDynamicHttpServer("/basepath", out var root, out var baseAddress);
+            baseServer.Options.UrlPrefixes.Add(baseAddress + "secondTier");
+            using var server = Utilities.CreateServerOnExistingQueue(baseServer.Options.RequestQueueName);
+            server.Options.UrlPrefixes.Add(baseAddress); // Keep them in sync
+            server.Options.UrlPrefixes.Add(baseAddress + "secondTier");
+
+            var responseTask = SendRequestAsync(root + "/basepath/secondTier/path/thing");
+
+            var context = await server.AcceptAsync(Utilities.DefaultTimeout).Before(responseTask);
+            Assert.Equal("/basepath/secondTier", context.Request.PathBase);
+            Assert.Equal("/path/thing", context.Request.Path);
+            context.Dispose();
+
+            var response = await responseTask;
+            Assert.Equal(string.Empty, response);
+        }
+
         [ConditionalFact]
         // Changes to the base server are reflected
         public async Task Server_HotAddPrefix_Success()