GNU bug report logs - #37207
nginx serving files from the store returns Last-Modified = Epoch

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From: Tobias Geerinckx-Rice <me <at> tobias.gr>
To: 37207 <at> debbugs.gnu.org
Subject: bug#37207: guix.gnu.org Last Modified at epoch
Date: Wed, 28 Aug 2019 16:37:15 +0200

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Gábor, Ludo',

Gábor Boskovits 写道：
> Supressing the last modified header is just an
> add_header Last-Modified "";
> away.

You'll also need:

# Don't honour client If-Modified-Since constraints.
if_modified_since off;
# Nginx's etags are hashes of file timestamp & file length.
etag off;

Turning these off will of course prevent all caching.  I don't 
know if that would add measurable load to guix.gnu.org (it would 
be more problematic if we used a CDN, but it might still make a 
difference).

Nix does something both interesting and icky — as always: patch[0] 
nginx to look up the realpath() instead, so clients can still 
cache using If-None-Match.

Kind regards,

T G-R

[0]: https://github.com/NixOS/nixpkgs/pull/48337

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