Nested ESI + gzip + Squid 2.7.STABLE9 = invalid compressed data--format violated

[Poul-Henning Kamp]

In message <AANLkTikR3Q7jUmKh4psPiEgjfTUwhAUOpi+s0n-P9r1m at mail.gmail.com>, Andr
ea Campi writes:

>Long story short, I finally realized the problem is not with Varnish
>per se, but with the office proxy (Squid 2.7.STABLE9); it seems to
>corrupt the gzip stream just after the 00 00 FF FF sequence:
>
>-0004340    5d  90  4a  4e  4e  00  00  00  00  ff  ff  ec  3d  db  72  dc
>+0004340    5d  90  4a  4e  4e  00  00  00  00  ff  ff  00  3d  db  72  dc
>
>-0024040    75  21  aa  39  01  00  00  00  ff  ff  d4  59  db  52  23  39
>+0024040    75  21  aa  39  01  00  00  00  ff  ff  00  59  db  52  23  39
>
>and so on.

We found a similar issue in ngnix last week:  A 1 byte chunked encoding
get zap'ed to 0x00 just like what you show.

Are you sure there is no ngnix instance involved ?  It would be weird
of both squid and ngnix has the same bug ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.