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常用的功能。

访问不存在的图片显示默认图片

Nginx

location ~* \.(jpg|jpeg|gif|png)$ {
    try_files $uri /not-exists.jpg =404;
}

Apache

...

设置指定文件类型过期时间

Nginx

location ~* \.(jpg|gif|png|ico|gif|css|js|svg)$ {
    expires 30d;
}

# 其时间单位有如下选项
# ms milliseconds
# s	seconds
# m	minutes
# h	hours
# d	days
# w	weeks
# M	months, 30 days
# y	years, 365 days

Apache

ExpiresActive on
ExpiresByType image/jpg "access 1 years"
ExpiresByType image/png "access 1 years"
ExpiresByType image/gif "access 1 years"
ExpiresByType image/jpeg "access 1 years"

# 其时间单位有如下选项
# years
# months
# weeks
# days
# hours
# minutes
# seconds