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epriestley 43935d5916 Don't cache resources we can't generate properly 
Summary:
Fixes T10843. In a multi-server setup, we can do this:

  - Two servers, A and B.
  - You push an update.
  - A gets pushed first.
  - After A has been pushed, but before B has been pushed, a user loads a page from A.
  - It generates resource URIs like `/stuff/new/package.css`.
  - Those requests hit B.
  - B doesn't have the new resources yet.
  - It responds with old resources.
  - Your CDN caches things. You now have a poisoned CDN: old data is saved in a new URL.

To try to avoid this with as little work as possible and generally make it hard to get wrong, check the URL hash against the hash we would generate.

If they don't match, serve our best guess at the resource, but don't cache it. This should make things mostly keep working during the push, but prevent caches from becoming poisoned, and everyone should get a working version of everything after the push finishes.

Test Plan:
  - `curl`'d a resource, got a cacheable one.
  - Changed the hash a little, `curl`'d again. This time: valid resource, but not cacheable.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10843

Differential Revision: https://secure.phabricator.com/D15775
2016-04-21 11:56:54 -07:00
bin Provide bin/nuance import and ngram indexes for sources 2016-03-08 10:30:24 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Improve Amazon SES code error handling behavior 2016-04-05 17:28:45 -07:00
resources Give application actors in feed reasonable icons 2016-04-20 14:38:55 -07:00
scripts Allow cluster devices to SSH to one another without acting as a user 2016-04-19 13:04:41 -07:00
src Don't cache resources we can't generate properly 2016-04-21 11:56:54 -07:00
support Support Aphlict clustering 2016-04-14 13:26:30 -07:00
webroot Give application actors in feed reasonable icons 2016-04-20 14:38:55 -07:00
.arcconfig Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Move server-related Aphlict options to a configuration file 2016-04-14 04:54:42 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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