This is indeed a bug, however it should have been fixed as part of https://issues.jboss.org/browse/UNDERTOW-180.
Looking at the code it appears that AsyncSenderImpl also has this issue, I will fix it up (https://issues.jboss.org/browse/UNDERTOW-385).
Stuart
> _______________________________________________
----- Original Message -----
> From: "Edgar Espina" <espina.edgar@gmail.com>
> To: undertow-dev@lists.jboss.org
> Sent: Tuesday, 10 February, 2015 10:36:20 PM
> Subject: [undertow-dev] transfer-encoding vs content-length with small response
>
> Hi,
>
> I know that Undertow figure it out a content-length or transfer-encoding
> header when none of them was set. That's good and it works as expected.
>
> It seems to be a problem when you explicitly set the "Transfer-Encoding"
> header bc Undertow, still add the Content-Length (on small responses?) but
> it doesn't remove the Transfer-Encoding header.
>
> On such cases, the response contains both headers, which I think it's wrong,
> no?
>
> --
> edgar
>
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