前陣子調整了一些 Apache HTTPD & Tomcat & nginx 的 cache 機制與內容壓縮機制，稍微紀錄一下。
Apache HTTPD 的 cache：
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType text/css "access plus 1 month"
</IfModule>
Apache HTTPD 的壓縮：
<IfModule mod_deflate.c>
DeflateCompressionLevel 9
AddOutputFilterByType DEFLATE text/html text/plain text/xml application/x-httpd-php
AddOutputFilter DEFLATE js css
</IfModule>
Apache Tomcat 的 cache（在 application 的 web.xml 做調整）：
<filter>
<filter-name>ExpiresFilter</filter-name>
<filter-class>org.apache.catalina.filters.ExpiresFilter</filter-class>
<init-param>
<param-name>ExpiresByType image</param-name>
<param-value>access plus 1 month</param-value>
</init-param>
<init-param>
<param-name>ExpiresByType text/css</param-name>
<param-value>access plus 1 month</param-value>
</init-param>
<init-param>
<param-name>ExpiresByType application/javascript</param-name>
<param-value>access plus 1 month</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>ExpiresFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>Apache Tomcat 的壓縮（在 conf/server.xml 做調整）：
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
compression="on" compressableMimeType="text/html,text/xml,text/plain,text/css,application/javascript"
redirectPort="8443" />nginx 的 cache（在 server tag 內做調整）：
location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
expires 1M;
}nginx 的壓縮（在 http tag 內做調整）：
gzip_vary on;
gzip_proxied any;
gzip_comp_level 9;
gzip_buffers 8 32k;
gzip_http_version 1.0;
gzip_types text/plain text/css application/json
application/javascript application/x-javascript text/javascript
text/xml application/xml application/rss+xml application/atom+xml application/rdf+xml;大概就調這些，其他多媒體檔案就看需求了…
2 月 22 2016
改用 Let’s Encrypt 的 certificates
之前都在用 StartSSL 的免費 certificate，雖知道有 Let’s Encrypt，但因手邊幾乎都轉用 nginx，遲遲沒下手。
約莫一週前 zeroplex 丟了這個網頁：「Why I stopped using StartSSL (Hint: it involves a Chinese company)」，三、四天前 DK 大神也撰文提及，就決定趁週末沒什麼事來動工…
用 DK 大神在一個月前撰文提過的 dehydrated 這個 GitHub 專案可以輕鬆搞定，步驟大致如下…
dehydrated/dehydrated -c -d {網站hostname}server { listen 443 ssl http2; listen [::]:443 ssl http2; ssl on; ssl_certificate /SOMEWHERE/dehydrated/certs/{網站hostname}/fullchain.pem; ssl_certificate_key /SOMEWHERE/dehydrated/certs/{網站hostname}/privkey.pem; ssl_trusted_certificate /SOMEWHERE/dehydrated/certs/{網站hostname}/fullchain.pem; .... }我記得 Let’s Encrypt 的 certificate 要在 90 天內 renew，所以 cron job 這樣放：
0 0 1 */2 * /SOMEWHERE/dehydrated/letsencrypt.sh -c -d {網站hostname} > /dev/null 2>&1Updated : letsencrypt.sh 改為 dehydrated 。
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By Joe Horn • WWW • Tags: certificate, dehydrated, HTTPS, Let's Encrypt, letsencrypt.sh, nginx, SSL, StartSSL