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* If upstreams are all using same host but with different ports
ie:
foobar:4001
foobar:4002
foobar:4003
...
Because fnv-1a has not a good enough avalanche effect
Then the hostByHashing result is not well balanced over
all upstreams
As last byte FNV input tend to affect few bits, the idea is to change
the concatenation order between the key and the upstream strings
So the upstream last byte have more impact on hash diffusion
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* reverseproxy: Improve hashing LB policies with HRW
Previously, if a list of upstreams changed, hash-based LB policies
would be greatly affected because the hash relied on the position of
upstreams in the pool. Highest Random Weight or "rendezvous" hashing
is apparently robust to pool changes. It runs in O(n) instead of
O(log n), but n is very small usually.
* Fix bug and update tests
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* reverseproxy: Begin refactor to enable dynamic upstreams
Streamed here: https://www.youtube.com/watch?v=hj7yzXb11jU
* Implement SRV and A/AAA upstream sources
Also get upstreams at every retry loop iteration instead of just once
before the loop. See #4442.
* Minor tweaks from review
* Limit size of upstreams caches
* Add doc notes deprecating LookupSRV
* Provision dynamic upstreams
Still WIP, preparing to preserve health checker functionality
* Rejigger health checks
Move active health check results into handler-specific Upstreams.
Improve documentation regarding health checks and upstreams.
* Deprecation notice
* Add Caddyfile support, use `caddy.Duration`
* Interface guards
* Implement custom resolvers, add resolvers to http transport Caddyfile
* SRV: fix Caddyfile `name` inline arg, remove proto condition
* Use pointer receiver
* Add debug logs
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
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* caddyhttp: reverseproxy: fix hash selection policy
Fixes: #4135
Test: go test './...' -count=1
* caddyhttp: reverseproxy: add test to catch #4135
If you revert the last commit, the test will fail.
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* add CookieHashSelection for session affinity
* add CookieHashSelection for session affinity
* register module
* reverse_proxy: Add and fix cookie lb_policy
* reverse_proxy: Manage hmac.write error on cookie hash selection
* reverse_proxy: fix some comments
* reverse_proxy: variable `cookieValue` is inside the else block
* reverse_proxy: Abstract duplicate nuanced logic of reservoir sampling into a function
* reverse_proxy: Set a default secret is indeed useless
* reverse_proxy: add configuration syntax for cookie lb_policy
* reverse_proxy: doc typo and improvement
Co-authored-by: utick <123liuqingdong@163.com>
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