[squid-users] 'Transfer-Encoding: chunked, chunked' rejected by Squid

[Alex Rousskov]

On 8/15/23 15:04, Andreas Weigel wrote:

> just in reference to 
> https://github.com/squid-cache/squid/pull/702#issuecomment-762459132, I 
> was made aware of a(nother) buggy server in the wild, that sends the 
> header quoted in the subject (Squid version 4.16) in its response: 
> https://riverbird.de. Squid rejects connection to that server with an 
> "Invalid response..." error message, while all browsers I used were able 
> to open the website.
> 
> The server seemingly only shows the behavior if 'Accept-Encoding: gzip' 
> is set in the request. The actual encoding used for the response is a 
> simple (single) chunked encoding.

FWIW, in my test, that server sent two identical "Transfer-Encoding: 
chunked" and many other duplicated header fields:

> HTTP/1.1 200 OK
> Date: Thu, 17 Aug 2023 16:44:46 GMT
> Server: Apache
> Link: ...
> Set-Cookie: <cookie1>
> Set-Cookie: <cookie2>
> Set-Cookie: <cookie2>
> Vary: Accept-Encoding
> X-Via-NSCOPI: 1.0
> X-Via-NSCOPI: 1.0
> Transfer-Encoding: chunked
> Transfer-Encoding: chunked
> Content-Type: text/html; charset=UTF-8
> Cache-Control: no-cache
> Cache-Control: no-cache
> Strict-Transport-Security: max-age=157680000
> Strict-Transport-Security: max-age=157680000; includeSubDomains
> Content-Encoding: gzip

I could not quickly check what the actual transfer encoding was.

Alex.