diff --git a/SimpleHttpServer/Types/RequestContext.cs b/SimpleHttpServer/Types/RequestContext.cs
index ffe8f0a..f49128b 100644
--- a/SimpleHttpServer/Types/RequestContext.cs
+++ b/SimpleHttpServer/Types/RequestContext.cs
@@ -52,8 +52,10 @@ public class RequestContext : IDisposable {
     public async Task SetStatusCodeAndDisposeAsync(HttpStatusCode status) {
         using (this) {
             SetStatusCode((int) status);
-            await WriteToRespAsync("\n\n");
-            await RespWriter.FlushAsync();
+            if (status != HttpStatusCode.NotModified) { // NotModified must not write any data to response
+                await WriteToRespAsync("\n\n");
+                await RespWriter.FlushAsync();
+            }
         }
     }