[squid-users] URL sometimes reurns empty response

[Marcus Kool]

Looks like MS uses multiple servers for msftconnecttest.com and that they send different content.

On 02/05/17 08:59, Ralf Hildebrandt wrote:
> In some cases, our proxies (got 4 of them) return a empty result when
> querying "http://www.msftconnecttest.com/ncsi.txt" (whcih is used by
> Microsoft Brwosers to check if they're online).
>
> I'm using this incantation to check the URL:
>
> watch -d curl --silent -v -x "http://proxy-cvk-1.charite.de:8080" http://www.msftconnecttest.com/ncsi.txt
>
> Usually, the URL should just return "Microsoft NCSI".
> In some cases I get an empyt response, but curl reports:
>
> < Age: 5
> < X-Cache: HIT from proxy-cvk-1
> < Via: 1.1 proxy-cvk-1 (squid/5.0.0-20170421-r15126)
> < Connection: keep-alive
> <
> * Excess found in a non pipelined read: excess = 14 url = /ncsi.txt (zero-length body)
> * Curl_http_done: called premature == 0
> * Connection #0 to host (nil) left intact
>
> As you can see, something is producing an excess of 14 Bytes (which
> coincides with the 14 bytes length of "Microsoft NCSI").
>
> < Cache-Control: max-age=30,must-revalidate
>
> Immediatly after revalidating, the problem occurs.
>
> I tried this with 5.0.0-20170421-r15126 as well as 4.0.19 - same result.
>