Support ETags for immutable files in web front-end #844
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Reference: tahoe-lafs/trac-2024-07-25#844
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Tahoe immutable files are, well, immutable. GETting an immutable file at a given URL should always retrieve the same content. But caching proxies don't know that.
For instance, in http://allmydata.org/pipermail/tahoe-dev/2009-November/003221.html , it is pointed out that adding a HTTP caching proxy on the client side of the gateway doesn't work:
If the gateway were to use a unique identifier for the file (such as its storage index / verify cap / read cap) as an ETag, and support the associated
If-Match
,If-None-Match
andVary
HTTP headers, then Squid (and any similar caching proxy that supports ETags) would know that the file hasn't changed.Note that if a caching proxy is used, file integrity will depend on the proxy's correctness and security.
Caching of mutable files/directories is more complicated and potentially error-prone; let's leave that to another ticket.
Oops. The current code is supposed to support ETags (search for
setETag
in code:src/allmydata/web/filenode.py). twisted.web.http also supportsIf-None-Match
. (I couldn't immediately see any support forIf-Match
orVary
, but I don't know whether they're needed.) So, this ticket is invalid as an enhancement.This doesn't explain why Squid was concluding that immutable files had been changed, but that should be a different ticket.