Server Fault Asked by cortopy on November 27, 2020
I’m trying to configure nginx to perform geoIP checks on first-time visitors only.
The idea is that first-time visitors should be redirected to the page version which has been customised for their language/country.
I’m able to check whether or not a certain cookie exists. If it does, then nginx can proceed and not redirect.
This set up means that all first-time visitors will be redirected to what it’s likely to be the most appropriate version of the page for their country/language. And at the same time, those users that wish to, can still browse freely all versions available afterwards.
I believe Google recommends this type of set up for multilingual/multisite webpages too.
The problem is that I get a redirect loop if the rewrite directive is placed outside the root location. Yet, because the US version is the same as /root, rewrites within locations have proven even more difficult to configure.
The geo_IP values are passed OK via fastcgi to php if no rewrite is specified, so I don’t think there is anything wrong with the setup apart from the rewrite itself.
This is my config:
map $geoip2_data_country_code $country_url {
default example.com; ##This is the US version
GB example.com/uk;
CA example.com/ca;
}
server {
listen 443 ssl spdy default_server;
server_name example.com;
root /var/www/html;
if ($http_cookie !~ "cookie_to_check") {
rewrite ^ https://$country_url break;
#Appending $request_uri to the rewrite yields very similar results
}
location / {
try_files $uri $uri/ /index.php?$args;
}
location /uk {
try_files $uri $uri/ /uk/index.php?$args;
}
location /ca {
try_files $uri $uri/ /ca/index.php?$args;
}
##Other locations
}
After a lot of trial and error, this is the configuration that would work and perform as expected.
The problem with my previous version was double:
Nginx was checking the existence of a cookie which is set by a php application behind nginx. Thanks to @AlexeyTen for pointing this out. Setting an extra cookie conditionally with nginx did the trick
map $geoip2_data_country_code $country_url {
default example.com; ##This is the US version
GB example.com/uk;
CA example.com/ca;
}
server {
listen 443 ssl spdy default_server;
server_name example.com;
root /var/www/html;
location / {
try_files $uri $uri/ /index.php?$args;
if ($http_cookie !~ "country=set") {
add_header Set-Cookie "country=set;Max-Age=31536000";
rewrite ^ $scheme://$country_url$request_uri break;
}
}
location /uk {
try_files $uri $uri/ /uk/index.php?$args;
if ($http_cookie !~ "country=set") {
add_header Set-Cookie "country=set;Max-Age=31536000";
rewrite ^ $scheme://$country_url$request_uri break;
}
}
location /ca {
try_files $uri $uri/ /ca/index.php?$args;
if ($http_cookie !~ "country=set") {
add_header Set-Cookie "country=set;Max-Age=31536000";
rewrite ^ $scheme://$country_url$request_uri break;
}
}
##Other locations
}
Answered by cortopy on November 27, 2020
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