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[docs] Apache setup for Caching assets and media (#2005) (#2005) 

Also change the nginx fileserver expiry, after discussion, to
one week, to match.
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mirabilos 2023-07-20 18:48:52 +02:00 committed by GitHub
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docs/advanced/caching/assets-media.md
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@ -20,6 +20,77 @@ The filesystem location of `/assets` is defined by the [`web-asset-base-dir`](..
## Configuration
### Apache 2.4
This is intended to behave identical to the nginx section below.
The `Cache-Control` header is manually set to merge the values
from the configuration and the `expires` directive to avoid
breakage from having two header lines. `Header set` defaults
to ` onsuccess`, so it is also not added to error responses.
Assuming your GtS installation is rooted in `/opt/GtS` with a
`storage` subdirectory, and the webserver has been given access,
add the following section to the vhost:
```
<Directory /opt/GtS/web/assets>
Options None
AllowOverride None
Require all granted
ExpiresActive on
ExpiresDefault A300
Header set Cache-Control "public, max-age=300"
</Directory>
RewriteRule "^/assets/(.*)$" "/opt/GtS/web/assets/$1" [L]
<Directory /opt/GtS/storage>
Options None
AllowOverride None
Require all granted
ExpiresActive on
ExpiresDefault A604800
Header set Cache-Control "private, immutable, max-age=604800"
</Directory>
RewriteCond "/opt/GtS/storage/$1" -f
RewriteRule "^/fileserver/(.*)$" "/opt/GtS/storage/$1" [L]
```
The trick here is that, in an Apache 2-based reverse proxy setup…
```
RewriteEngine On
RewriteCond %{HTTP:Upgrade} websocket [NC]
RewriteCond %{HTTP:Connection} upgrade [NC]
RewriteRule ^/?(.*) "ws://localhost:8980/$1" [P,L]
ProxyIOBufferSize 65536
ProxyTimeout 120
ProxyPreserveHost On
<Location "/">
ProxyPass http://127.0.0.1:8980/
ProxyPassReverse http://127.0.0.1:8980/
</Location>
```
… everything is proxied by default, the `RewriteRule` bypasses
the proxy (by specifying a filesystem path to redirect to) for
specific URL præficēs and the `RewriteCond` ensures to only
disable the `/fileserver/` proxy if the file is, indeed, present.
Also run the following commands (assuming a Debian-like setup)
to enable the modules used:
```
$ sudo a2enmod expires
$ sudo a2enmod headers
$ sudo a2enmod rewrite
```
Then (after a configtest), restart Apache.
### nginx
Here's an example of the three location blocks you'll need to add to your existing configuration in nginx:
@ -47,7 +118,7 @@ server {
location /fileserver/ {
alias storage-local-base-path/;
autoindex off;
expires max;
expires 1w;
add_header Cache-Control "private, immutable";
try_files $uri @fileserver;
}
@ -62,9 +133,9 @@ The `/fileserver` location is a bit special. When we fail to fetch the media fro
The `expires` directive adds the necessary headers to inform the client how long it may cache the resource:
* For assets, which may change on each release, 5 minutes is used in this example
* For attachments, which should never change once they're created, `max` is used instead setting the cache expiry to the 31st of December 2037.
* For attachments, which should never change once they're created, we currently use one week
For other options, see the nginx documentation on the [`expires` directive](https://nginx.org/en/docs/http/ngx_http_headers_module.html#expires).
For other options, see the nginx documentation on the [`expires` directive](https://nginx.org/en/docs/http/ngx_http_headers_module.html#expires).
Nginx does not add cache headers to 4xx or 5xx response codes so a failure to fetch an asset won't get cached by clients. The `autoindex off` directive tells nginx to not serve a directory listing. This should be the default but it doesn't hurt to be explicit. The added `add_header` lines set additional options for the `Cache-Control` header: