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How do I make case insensitive regex in nginx server?

A serious problem came up after migrating the server from Ubuntu to Debian. Debian does not allow two files, such as " a.html

" and " a.html

", to be used in the same directory.

My server receives three types of requests and this is the current status:

requests such as /archive/2014/www.Test.com

are supplied with the file:/archive/2014/blank.html

requests like /archive/2015/Test.com

and /archive/2015/www.Test.com

come with a file/archive/2015/T.html

requests like /archive/2015/Test.com

and /archive/2015/www.Test.com

come with a file/archive/2015/T.html

I want the last two types of queries to supply the file /archive/2015/T.html

in both cases (in case insensitive case).

How could I achieve this result?

Current server settings:

server {
    listen   127.0.0.1:80;
    server_name 127.0.0.1;

    access_log /srv/siteone/logs/access.log;
    error_log /srv/siteone/logs/error.log error;

    location / {
        root   /srv/siteone/html;
        index  index.html index.htm;
        expires 1d;
    }

    rewrite ^/archive/2014/(.+)$ /archive/2014/blank.html last;
    rewrite ^/archive/2015/(www\.)*(.)(.+)$ /archive/2015/$2.html last; 

    error_page  403  /403.html;
    error_page  404  /404.html;

}
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1 answer


There are many ways to solve this problem.



  • Since you only need to change one specific letter to lowercase, you can use a "map" with a case-insensitive regex:

    map $request $letter {
    "~*^/archive/[0-9]{4}/(www\.)?a(.*)?$"  a;
    "~*^/archive/[0-9]{4}/(www\.)?b(.*)?$"  b;
    "~*^/archive/[0-9]{4}/(www\.)?c(.*)?$"  c;
    "~*^/archive/[0-9]{4}/(www\.)?d(.*)?$"  d;
    "~*^/archive/[0-9]{4}/(www\.)?e(.*)?$"  e;
    "~*^/archive/[0-9]{4}/(www\.)?f(.*)?$"  f;
    "~*^/archive/[0-9]{4}/(www\.)?g(.*)?$"  g;
    "~*^/archive/[0-9]{4}/(www\.)?h(.*)?$"  h;
    "~*^/archive/[0-9]{4}/(www\.)?i(.*)?$"  i;
    "~*^/archive/[0-9]{4}/(www\.)?j(.*)?$"  j;
    "~*^/archive/[0-9]{4}/(www\.)?k(.*)?$"  k;
    "~*^/archive/[0-9]{4}/(www\.)?l(.*)?$"  l;
    "~*^/archive/[0-9]{4}/(www\.)?m(.*)?$"  m;
    "~*^/archive/[0-9]{4}/(www\.)?n(.*)?$"  n;
    "~*^/archive/[0-9]{4}/(www\.)?o(.*)?$"  o;
    "~*^/archive/[0-9]{4}/(www\.)?p(.*)?$"  p;
    "~*^/archive/[0-9]{4}/(www\.)?q(.*)?$"  q;
    "~*^/archive/[0-9]{4}/(www\.)?r(.*)?$"  r;
    "~*^/archive/[0-9]{4}/(www\.)?s(.*)?$"  s;
    "~*^/archive/[0-9]{4}/(www\.)?t(.*)?$"  t;
    "~*^/archive/[0-9]{4}/(www\.)?u(.*)?$"  u;
    "~*^/archive/[0-9]{4}/(www\.)?v(.*)?$"  v;
    "~*^/archive/[0-9]{4}/(www\.)?w(.*)?$"  w;
    "~*^/archive/[0-9]{4}/(www\.)?x(.*)?$"  x;
    "~*^/archive/[0-9]{4}/(www\.)?y(.*)?$"  y;
    "~*^/archive/[0-9]{4}/(www\.)?z(.*)?$"  z;
}

server {
    listen   127.0.0.1:80;
    server_name 127.0.0.1;

    access_log /srv/siteone/logs/access.log;
    error_log /srv/siteone/logs/error.log error;

    root   /srv/siteone/html;

    location / {
        index  index.html index.htm;
        expires 1d;
    }

    rewrite ^/archive/2014/(.+)$ /archive/2014/blank.html last;
    rewrite ^/archive/2015/(www\.)?(.)(.+)$ /archive/2015/$letter.html last; 

    error_page  403  /403.html;
    error_page  404  /404.html;
}

  • If you have the Embedded Perl module installed (sudo apt-get install nginx-extras), you can use Perl to get the lowercase query string:

    perl_set $uri_lowercase 'sub {
    my $r = shift;
    return lc($r->uri);
}';

server {
    listen   127.0.0.1:80;
    server_name 127.0.0.1;

    access_log /srv/siteone/logs/access.log;
    error_log /srv/siteone/logs/error.log error;

    root   /srv/siteone/html;

    location / {
        index  index.html index.htm;
        expires 1d;
    }

    rewrite ^/archive/2014/(.+)$ /archive/2014/blank.html last;
    rewrite ^/archive/2015/(www\.)?(.)(.+)$ $uri_lowercase;
    rewrite ^/archive/2015/(www\.)?(.)(.+)$ /archive/2015/$2.html last;

    error_page  403  /403.html;
    error_page  404  /404.html;
}

  • If you prefer Lua over Perl, you can do the same with Lua (again, you need to install nginx-extras):

    server {
    listen   127.0.0.1:80;
    server_name 127.0.0.1;

    access_log /srv/siteone/logs/access.log;
    error_log /srv/siteone/logs/error.log error;

    root   /srv/siteone/html;

    location / {
        index  index.html index.htm;
        expires 1d;
    }

    rewrite ^/archive/2014/(.+)$ /archive/2014/blank.html last;
    rewrite_by_lua 'ngx.req.set_uri(string.lower(ngx.var.uri), false)';
    rewrite ^/archive/2015/(www\.)?(.)(.+)$ /archive/2015/$2.html last;

    error_page  403  /403.html;
    error_page  404  /404.html;
}

  • If you don't like all of the above, there is always some dark Nginx trick that could help (but I really don't recommend it):

    server {
    listen   127.0.0.1:8484;

    access_log off;

    rewrite ^.*$ /archive/2015/$host.html;

    root /srv/siteone/html;

    location / {
        index  index.html index.htm;
        expires 1d;
    }
}

server {
    listen   127.0.0.1:80;
    server_name 127.0.0.1;

    access_log /srv/siteone/logs/access.log;
    error_log /srv/siteone/logs/error.log error;

    root   /srv/siteone/html;

    location / {
        index  index.html index.htm;
        expires 1d;
    }

    location ~* ^/archive/2015/(?<letter>[A-Z])\.html$ {
        proxy_set_header Host $letter;
        proxy_pass http://127.0.0.1:8484;
    }

    rewrite ^/archive/2014/(.+)$ /archive/2014/blank.html last;
    rewrite ^/archive/2015/(www\.)?(.)(.+)$ /archive/2015/$2.html last;

    error_page  403  /403.html;
    error_page  404  /404.html;
}
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