Handle T-E edge cases #43664 (#43671)

Author: Tratcher

src/Servers/Kestrel/Core/src/Internal/Http/HttpHeaders.cs

@@ -564,6 +564,14 @@ public static TransferCoding GetFinalTransferCoding(StringValues transferEncodin
                             offset += sizeof(uint) / 2;
                             transferEncodingOptions = TransferCoding.Chunked;
                         }
+                        else
+                        {
+                            transferEncodingOptions = TransferCoding.Other;
+                        }
+                    }
+                    else
+                    {
+                        transferEncodingOptions = TransferCoding.Other;
                     }
 
                     if ((uint)offset >= (uint)values.Length)

src/Servers/Kestrel/Core/test/HttpHeadersTests.cs

@@ -174,6 +174,9 @@ public void TestParseConnectionMultipleValues(string value1, string value2, int
         [InlineData(",, ", (int)(TransferCoding.None))]
         [InlineData(" , ,", (int)(TransferCoding.None))]
         [InlineData(" , , ", (int)(TransferCoding.None))]
+        [InlineData("c", (int)(TransferCoding.Other))]
+        [InlineData("z", (int)(TransferCoding.Other))]
+        [InlineData("chunk", (int)(TransferCoding.Other))]
         [InlineData("chunked,", (int)(TransferCoding.Chunked))]
         [InlineData("chunked,,", (int)(TransferCoding.Chunked))]
         [InlineData("chunked, ", (int)(TransferCoding.Chunked))]
@@ -191,6 +194,14 @@ public void TestParseConnectionMultipleValues(string value1, string value2, int
         [InlineData("deflate, chunked", (int)(TransferCoding.Chunked))]
         [InlineData("gzip,chunked", (int)(TransferCoding.Chunked))]
         [InlineData("compress,,chunked", (int)(TransferCoding.Chunked))]
+        [InlineData("chunked,c", (int)(TransferCoding.Other))]
+        [InlineData("chunked,z", (int)(TransferCoding.Other))]
+        [InlineData("chunked,zz", (int)(TransferCoding.Other))]
+        [InlineData("chunked, z", (int)(TransferCoding.Other))]
+        [InlineData("chunked, zz", (int)(TransferCoding.Other))]
+        [InlineData("chunked,chunk", (int)(TransferCoding.Other))]
+        [InlineData("z,chunked", (int)(TransferCoding.Chunked))]
+        [InlineData("z, chunked", (int)(TransferCoding.Chunked))]
         [InlineData("chunkedchunked", (int)(TransferCoding.Other))]
         [InlineData("chunked2", (int)(TransferCoding.Other))]
         [InlineData("chunked 2", (int)(TransferCoding.Other))]