Yes. I originally looked at a plugin but as I thought about it I came to the
conclusion that negative caching 400 is simply the wrong thing to do, because
it is dependent on the user agent, not the origin server, and likely has no
relationship to the success of subsequent requests, which is diff
Just for the sake of completeness, it should be fairly straightforward to write
a plugin or even use conf_remap/header_rewrite to basically strip Cache-Control
headers from the Origin AND override proxy.config.http.negative_caching_enabled
to false on a 400 status from the Origin.
Although, my
Yes, it's about proxy.config.http.negative_caching_enabled. My reading of the
document is that
1) If enabled, the negative response is cached regardless of any Cache-Control:
value.2) If disabled, the negative response is cached only if origin provide
Cache-Control indicates it should be.
Are we just talking about
proxy.config.http.negative_caching_enabled
https://docs.trafficserver.apache.org/en/latest/admin-guide/files/records.config.en.html#proxy-config-http-negative-caching-enabled
If so, then the doc implies that it only affects responses without
cacheable Cache-control direct
As with any kind of response caching, the presumption is that, *if* the Origin
included Cache Control headers that permitted Caching of a 400 response, it
(the Origin) must know and expect that subsequent requests with matching "cache
key" may be served directly from the caches. If the Origin di
But that would be very specific to the bad request. Why would it benefit the
next request to be denied with that same response?
On Wednesday, November 9, 2016 11:23 AM, Sudheer Vinukonda
wrote:
Generally, I'd think if the Origin responded with Cache-Control headers that
permit cachin
Generally, I'd think if the Origin responded with Cache-Control headers that
permit caching, it should be cached.
For e.g., for a 400 response, the Origin may include a Cache-Control: Vary
header indicating what parts of the request that it didn't like.
- Sudheer
From: Alan Carroll
To: D
