This is a simple caching plugin for caddy server
Notice: Although this plugin works with static content it is not advised. Static content will not see great benefits. It should be used when there are slow responses, for example when using caddy as a proxy to a slow backend.
Notice: Build requires Go 1.12 or higher.
To use it you need to compile your own version of caddy with this plugin. First fetch the code
export GO111MODULE=on
go get -u github.com/caddyserver/caddy/...
go get -u github.com/nicolasazrak/caddy-cache/...
Then update the file in $GOPATH/src/github.com/caddyserver/caddy/caddy/caddymain/run.go
and import _ "github.com/nicolasazrak/caddy-cache"
.
And finally build caddy with:
cd $GOPATH/src/github.com/caddyserver/caddy/caddy
./build.bash
This will produce the caddy binary in that same folder. For more information about how plugins work read this doc.
Example minimal usage in Caddyfile
caddy.test {
proxy / yourserver:5000
cache
}
This will store in cache responses that specifically have a Cache-control
, Expires
or Last-Modified
header set.
For more advanced usages you can use the following parameters:
match_path
: Paths to cache. For examplematch_path /assets
will cache all successful responses for requests that start with /assets and are not marked as private.match_header
: Matches responses that have the selected headers. For examplematch_header Content-Type image/png image/jpg
will cache all successful responses that with content typeimage/png
ORimage/jpg
. Note that if more than one is specified, anyone that matches will make the response cacheable.path
: Path where to store the cached responses. By default it will use the operating system temp folder.default_max_age
: Max-age to use for matched responses that do not have an explicit expiration. (Default: 5 minutes)status_header
: Sets a header to add to the response indicating the status. It will respond with: skip, miss or hit. (Default:X-Cache-Status
)cache_key
: Configures the cache key using Placeholders, it supports any of the request placeholders. (Default:{method} {host}{path}?{query}
)
caddy.test {
proxy / yourserver:5000
cache {
match_path /assets
match_header Content-Type image/jpg image/png
status_header X-Cache-Status
default_max_age 15m
path /tmp/caddy-cache
}
}
Caddy-cache adds a {cache_status}
placeholder that can be used in logs.
Benchmark files are in benchmark
folder. Tests were run on my Lenovo G480 with Intel i3 3220 and 8gb of ram.
-
First test: Download
sherlock.txt
(608 Kb) file from the root (caddy.test3), a proxy to root server (caddy.test2) and a proxy to root server with cache (caddy.test).wrk -c 400 -d 30s --latency -t 4 http://caddy.test:2015/sherlock.txt
Req/s Throughput 99th Latency proxy + cache 4548.03 2.64 GB/s 561.39 ms proxy 1043.61 619.65 MB/s 1.00 s root 3668.14 2.13 GB/s 612.39 ms -
Second test: Download
montecristo.txt
(2,6 Mb) file from the root (caddy.test3), a proxy to root server (caddy.test2) and a proxy to root server with cache (caddy.test).wrk -c 400 -d 30s --latency -t 4 http://caddy.test:2015/montecristo.txt
Req/s Throughput 99th Latency proxy + cache 1199.81 3.01 GB/s 1.65 s proxy 473.14 1.20 GB/s 1.81 s root 1064.44 2.66 GB/s 1.71 s -
Third test: Download
pg31674.txt
(41 Kb) a root server (caddy.test5) with gzip and a proxy to root server with cache (caddy.test4).wrk -c 50 -d 30s --latency -H 'Accept-Encoding: gzip' -t 4 http://caddy.test4:2015/pg31674.txt
Req/s Throughput 99th Latency proxy + cache 16547.84 242.05 MB/s 22.48ms root 792.08 11.60 MB/s 109.98ms
- Support
vary
header - Add header with cache status
- Stream responses while fetching them from upstream
- Locking concurrent requests to the same path
- File disk storage for larger objects
- Add a configuration to not use query params in cache key (via
cache_key
directive) - Purge cache entries #1
- Serve stale content if proxy is down
- Punch hole cache
- Do conditional requests to revalidate data
- Max entries size