Estou perguntando aqui, pois não importa o que eu tente, continuo notando que as imagens continuam sendo recarregadas depois de um tempo. Basicamente, quero que as imagens sejam armazenadas em cache por 11 meses, mas, no mínimo, elas parecem ficar armazenadas em cache por minutos ou horas. Este é um aplicativo node.js com arquivos estáticos servidos pelo Apache. As imagens estão dentro do diretório public/static. Isto é o que eu tenho:
NameVirtualHost *:443
<VirtualHost *:443>
ServerName app.site.com
ProxyPreserveHost On
RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
RequestHeader set "X-Forwarded-SSL" expr=%{HTTPS}
Alias "/static/" "/home/node/app/public/static/"
<Directory /home/node/app/public>
Options FollowSymLinks
AllowOverride None
Require all granted
ExpiresActive On
ExpiresByType image/jpeg "access plus 11 months"
ExpiresByType image/jpg "access plus 11 months"
ExpiresByType image/png "access plus 11 months"
ExpiresByType image/gif "access plus 11 months"
</Directory>
RewriteEngine On
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*) ws://localhost:3210/$1 [P,L]
RewriteCond %{HTTP:Upgrade} !=websocket [NC]
RewriteRule ^/(?!static/)(.*)$ http://localhost:3210/$1 [P,L]
SSLCertificateFile /root/.lego/certificates/_.site.com.crt
SSLCertificateKeyFile /root/.lego/certificates/_.site.com.key
</VirtualHost>
Ter o console aberto e recarregado para capturar a atividade da rede mostra isso em uma imagem aleatória:
200 OK
Response header:
HTTP/1.1 200 OK
Date: Wed, 12 Aug 2020 10:27:50 GMT
Server: Apache
Last-Modified: Mon, 01 Jun 2020 19:03:16 GMT
ETag: "3313-5a70a727f2500"
Accept-Ranges: bytes
Content-Length: 13075
Cache-Control: max-age=28512000
Expires: Thu, 08 Jul 2021 10:27:50 GMT
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: image/png
Request header:
GET /static/img/profile_5a914158141c9367e38c4d8a.png?ver=74 HTTP/1.1
Host: hue.merkoba.com
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:79.0) Gecko/20100101 Firefox/79.0
Accept: image/webp,*/*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Referer: https://app.site.com/
Cookie: connect.sid=s%3AUZb7Zopuy6LId0iMeMYVaKDtfuppIIxL.8F7Hx%2FeqrodOsS2fHPZjOqRDKTBM4RoBwcKiUu0PUUg; io=fbMMZAHDTJzbnoVvAAAo
Cache-Control: max-age=0
If-Modified-Since: Mon, 01 Jun 2020 19:03:16 GMT
If-None-Match: "3313-5a70a727f2500"
Alguns testes de ondulação:
curl -vso /dev/null https://app.site.com/static/img/profile_5f192733805c646004ecf4c8.png?ver=1
* Trying 196.83.125.124:443...
* TCP_NODELAY set
* Connected to app.site.com (192.81.135.159) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
} [5 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [112 bytes data]
* TLSv1.2 (IN), TLS handshake, Certificate (11):
{ [2391 bytes data]
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
{ [147 bytes data]
* TLSv1.2 (IN), TLS handshake, Server finished (14):
{ [4 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
} [37 bytes data]
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.2 (OUT), TLS handshake, Finished (20):
} [16 bytes data]
* TLSv1.2 (IN), TLS handshake, Finished (20):
{ [16 bytes data]
* SSL connection using TLSv1.2 / ECDHE-ECDSA-AES256-GCM-SHA384
* ALPN, server accepted to use http/1.1
* Server certificate:
* subject: CN=*.site.com
* start date: May 14 20:51:05 2020 GMT
* expire date: Aug 12 20:51:05 2020 GMT
* subjectAltName: host "app.site.com" matched cert's "*.site.com"
* issuer: C=US; O=Let's Encrypt; CN=Let's Encrypt Authority X3
* SSL certificate verify ok.
} [5 bytes data]
> GET /static/img/profile_5f192733805c646004ecf4c8.png?ver=1 HTTP/1.1
> Host: app.site.com
> User-Agent: curl/7.68.0
> Accept: */*
>
{ [5 bytes data]
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Date: Wed, 12 Aug 2020 10:30:40 GMT
< Server: Apache
< Last-Modified: Thu, 23 Jul 2020 06:01:07 GMT
< ETag: "16f27-5ab15950eeec0"
< Accept-Ranges: bytes
< Content-Length: 93991
< Cache-Control: max-age=28512000
< Expires: Thu, 08 Jul 2021 10:30:40 GMT
< Content-Type: image/png
<
{ [5 bytes data]
* Connection #0 to host app.site.com left intact