apply a monkey patch to the server responseto

to not raise an error on unbuffered close

config/initializers/kemal.cr

@@ -1,3 +1,4 @@
+require "../../src/ext/http/server/response"
 require "kemal"
 require "kemal-session"
 require "kemal-session-redis-engine"

src/ext/http/server/response.cr

@@ -0,0 +1,30 @@
+class HTTP::Server
+  class Response < IO
+    private def unbuffered_write(slice : Bytes) : Nil
+      return if slice.empty?
+
+      if response.headers["Transfer-Encoding"]? == "chunked"
+        @chunked = true
+      elsif !response.wrote_headers?
+        if response.version != "HTTP/1.0" && !response.headers.has_key?("Content-Length")
+          response.headers["Transfer-Encoding"] = "chunked"
+          @chunked = true
+        end
+      end
+
+      ensure_headers_written
+
+      if @chunked
+        slice.size.to_s(@io, 16)
+        @io << "\r\n"
+        @io.write(slice)
+        @io << "\r\n"
+      else
+        @io.write(slice)
+      end
+    rescue ex : IO::Error
+      unbuffered_close
+      # raise ClientError.new("Error while writing data to the client", ex)
+    end
+  end
+end