Update cached Content-Length when setting raw header.

src/Microsoft.AspNetCore.Server.Kestrel/Internal/Http/FrameHeaders.Generated.cs

@@ -6083,6 +6083,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Internal.Http
         }
         public void SetRawContentLength(StringValues value, byte[] raw)
         {
+            _contentLength = ParseContentLength(value);
             _bits |= 2048L;
             _headers._ContentLength = value;
             _headers._rawContentLength = raw;

test/Microsoft.AspNetCore.Server.KestrelTests/FrameResponseHeadersTests.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Text;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Server.Kestrel;
 using Microsoft.AspNetCore.Server.Kestrel.Internal;
@@ -166,6 +167,14 @@ namespace Microsoft.AspNetCore.Server.KestrelTests
             Assert.Throws<InvalidOperationException>(() => ((IHeaderDictionary)headers)["Content-Length"] = "bad");
         }
 
+        [Fact]
+        public void ThrowsWhenSettingRawContentLengthToNonNumericValue()
+        {
+            var headers = new FrameResponseHeaders();
+
+            Assert.Throws<InvalidOperationException>(() => headers.SetRawContentLength("bad", Encoding.ASCII.GetBytes("bad")));
+        }
+
         [Fact]
         public void ThrowsWhenAssigningHeaderContentLengthToNonNumericValue()
         {
@@ -193,6 +202,15 @@ namespace Microsoft.AspNetCore.Server.KestrelTests
             Assert.Equal(42, headers.HeaderContentLengthValue);
         }
 
+        [Fact]
+        public void ContentLengthValueCanBeReadAsLongAfterSettingRawHeader()
+        {
+            var headers = new FrameResponseHeaders();
+            headers.SetRawContentLength("42", Encoding.ASCII.GetBytes("42"));
+
+            Assert.Equal(42, headers.HeaderContentLengthValue);
+        }
+
         [Fact]
         public void ContentLengthValueCanBeReadAsLongAfterAssigningHeader()
         {

tools/Microsoft.AspNetCore.Server.Kestrel.GeneratedCode/KnownHeaders.cs

@@ -242,7 +242,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Internal.Http
         }}")}
         {Each(loop.Headers.Where(header => header.EnhancedSetter), header => $@"
         public void SetRaw{header.Identifier}(StringValues value, byte[] raw)
-        {{
+        {{{If(loop.ClassName == "FrameResponseHeaders" && header.Identifier == "ContentLength", () => @"
+            _contentLength = ParseContentLength(value);")}
             {header.SetBit()};
             _headers._{header.Identifier} = value;
             _headers._raw{header.Identifier} = raw;