diff --git a/.gitignore b/.gitignore
index eebfbb28..c8fc6114 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ pkg
 tmp
 .rbx/
 Gemfile.lock
+.idea/
diff --git a/lib/puma/client.rb b/lib/puma/client.rb
index 313d5b17..4252f6b7 100644
--- a/lib/puma/client.rb
+++ b/lib/puma/client.rb
@@ -267,6 +267,13 @@ module Puma
       end
     end
 
+    def write_408
+      begin
+        @io << ERROR_408_RESPONSE
+      rescue StandardError
+      end
+    end
+
     def write_500
       begin
         @io << ERROR_500_RESPONSE
diff --git a/lib/puma/const.rb b/lib/puma/const.rb
index 47aca798..3763f3d2 100644
--- a/lib/puma/const.rb
+++ b/lib/puma/const.rb
@@ -59,6 +59,9 @@ module Puma
     # The standard empty 404 response for bad requests.  Use Error4040Handler for custom stuff.
     ERROR_404_RESPONSE = "HTTP/1.1 404 Not Found\r\nConnection: close\r\nServer: Puma #{PUMA_VERSION}\r\n\r\nNOT FOUND".freeze
 
+    # The standard empty 408 response for requests that timed out.
+    ERROR_408_RESPONSE = "HTTP/1.1 408 Request Timeout\r\nConnection: close\r\nServer: Puma #{PUMA_VERSION}\r\n\r\n".freeze
+
     CONTENT_LENGTH = "CONTENT_LENGTH".freeze
 
     # Indicate that there was an internal error, obviously.
diff --git a/lib/puma/reactor.rb b/lib/puma/reactor.rb
index 5707e1f2..73ba5736 100644
--- a/lib/puma/reactor.rb
+++ b/lib/puma/reactor.rb
@@ -98,8 +98,9 @@ module Puma
 
             while @timeouts.first.timeout_at < now
               c = @timeouts.shift
-              sockets.delete c
+              c.write_408
               c.close
+              sockets.delete c
 
               break if @timeouts.empty?
             end