We need to figure out if nginx or the hackage-server is to blame here.
On Tue, Jun 10, 2014 at 1:34 AM, Gintautas Miliauskas < gintautas.miliaus...@gmail.com> wrote: > Hi, > > first of all, a shout out to all ZuriHac2014 folks, thanks for the gentle > introduction to the deeper trenches of Haskell infrastructure! > > I spent a bit of time looking into why "cabal update" always redownloads > the entire package list even though the code has explicit support for > etags, and it looks like etags are broken on the server side. The server > does serve "Etag" headers, but does not react to If-None-Match: > > $ curl -I --header 'If-None-Match: "1ea6c9a3168b9c186d5bbafd065ce5ec"' > hackage.haskell.org/packages/index.tar.gz > HTTP/1.1 200 OK > Server: nginx/1.6.0 > Date: Mon, 09 Jun 2014 23:22:49 GMT > Content-Type: application/x-gzip > Content-Length: 7193838 > Connection: keep-alive > Content-MD5: 1ea6c9a3168b9c186d5bbafd065ce5ec > ETag: "1ea6c9a3168b9c186d5bbafd065ce5ec" > Last-modified: Mon, 09 Jun 2014 23:10:44 GMT > > In this case the server is supposed to return a 304 code because the ETag > matches, but it returns the usual 200. > > Here's a well-behaved server for comparison: > > $ curl -I --header 'If-None-Match: f89ef04efbcb1bbd413c9170523beeb1' > http://upload.wikimedia.org/ > HTTP/1.1 304 Not Modified > Last-Modified: Thu, 03 Oct 2013 22:29:34 GMT > Etag: f89ef04efbcb1bbd413c9170523beeb1 > X-Timestamp: 1380839374.33426 > X-Object-Meta-Mtime: 1366745378.0 > Content-Type: text/html > X-Varnish: 2552484147 2541352860, 2937266545 2853346814, 523731362 > Via: 1.1 varnish, 1.1 varnish, 1.1 varnish > Accept-Ranges: bytes > Date: Mon, 09 Jun 2014 23:29:36 GMT > Age: 38954 > Connection: keep-alive > X-Cache: cp1064 hit (336), cp3010 hit (1791), cp3007 frontend miss (0) > Access-Control-Allow-Origin: * > Access-Control-Expose-Headers: Age, Content-Length, Date, X-Cache, > X-Varnish > > Note the 304 return code. > > I do not know about the configuration in use on the server, but something > seems to be wrong there. There are some nginx bug reports [1] about similar > issues, not sure if they are relevant here. > > [1] https://github.com/rgrove/rawgit/issues/13 > > Best regards, > -- > Gintautas Miliauskas > > _______________________________________________ > cabal-devel mailing list > cabal-devel@haskell.org > http://www.haskell.org/mailman/listinfo/cabal-devel > >
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