Nginx 禁止某些UA(User Agent)访问

一般来说,我们直接用nginx 的if 语句配合正则表达式就可以了,比如说

# case sensitive matching
if ($http_user_agent ~ (Antivirx|Arian)) {
return 403;

# case insensitive matching
if ($http_user_agent ~* (netcrawl|npbot|malicious)) {
return 403;

但是当我们需要禁止的user agent lists过长时,用if语句配合正则表达式就不是那么方便,而且性能上也会有影响,因此Nginx官方

多推荐使用map 来代替 if 语句

map $http_user_agent $badagent {
default 0;
~*malicious 1;
~*backdoor 1;
~*netcrawler 1;
~Antivirx 1;
~Arian 1;
~webbandit 1;

 if ($badagent) {
return 403;

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