#686: cabal install - Codec.Compression.Zlib: incorrect header check ---------------------------------+------------------------------------------ Reporter: Monsikos | Owner: Type: defect | Status: new Priority: high | Milestone: Component: cabal-install tool | Version: 1.8.0.2 Severity: major | Keywords: Zlib Difficulty: normal | Ghcversion: 6.12.1 Platform: | ---------------------------------+------------------------------------------ Changes (by finlay): * cc: finlay@… (added) * difficulty: unknown => normal * priority: normal => high * severity: normal => major * platform: Windows => Comment: After exploring this a bit more I have discovered that it is caused by secret ISP http proxy. There is a header: Content-Encoding: x-gzip that gets causes the file to be gunzipped before it gets to my computer. There are solutions: 1) patch cabal-install to not fail on files it expects to be gzipped but have been unzipped. I'll see if I can make a patch to do that. 2) make my ISP not proxy the http traffic (not very easy to do). 3) Remove the Content-Encoding: x-gzip header. I have bumped the severity because this error stops me from using cabal, a basic part of the batteries included platform. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/686#comment:4 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects