server {
    listen    8861;
    server_name abc.com;
  }

location = / {
  .....
}
# 只匹配http://abc.com
# http://abc.com [匹配成功]
# http://abc.com/index [匹配失败]

location ~ /Example/ {
  .....
}
#http://abc.com/Example/ [匹配成功]
#http://abc.com/example/ [匹配失败]

location ~* /Example/ {
  .....
}
# 则会忽略 uri 部分的大小写
#http://abc.com/test/Example/ [匹配成功]
#http://abc.com/example/ [匹配成功]

location ^~ /index/ {
  .....
}
#以 /img/ 开头的请求，都会匹配上
#http://abc.com/index/index.page  [匹配成功]
#http://abc.com/error/error.page [匹配失败]

location /index/ {
  error_page 404 @index_error;
}
location @index_error {
  .....
}
#以 /index/ 开头的请求，如果链接的状态为 404。则会匹配到 @index_error 这条规则上。

location /index/ {
  ......
}
#http://abc.com/index  [匹配成功]
#http://abc.com/index/index.page  [匹配成功]
#http://abc.com/test/index  [匹配失败]
#http://abc.com/Index  [匹配失败]
# 匹配到所有uri
location / {
  ......
}