I want to check if a parameter is present in a url in nginx and then rewrite.How can i do that?
For e.g if url is http://website.com/?mobile then redirect user to http://m.website.com
3 Answers
You better use http://example.com/?mobile=1 (argument with value). In this case checking is simple:
if ($arg_mobile) {
return 302 http://m.example.com/;
}
Checking for argument existance is usually done with regexp like if ($args ~ mobile) but it's error-prone, because it will match mobile anywhere, e.g. http://example.com/?tag=automobile.
7 Comments
user2650277
All i need to do is add the code above to my nginx conf.Does nginx already know that
$arg_mobile will check for ?mobile-1.
Alexey Ten
(=) — equality sign, not (-) hyphen. It will check for
mobile=pretty-anything except 0 (zero) and empty argument.
raksja
i'm getting nginx: [emerg] unknown directive "if($arg_querystringkey)" for version nginx/1.12.2. Is this not supported any more?
Alexey Ten
@raksja try to add space after “if”
raksja
thanks @AlexeyTen, it worked. I have a followup question on dynamic proxy_pass variable in here, can you pls take a look nginx dynamic proxy pass variable
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If you know you have only 1 parameter {{variable}} to switch, you can detect if exist like this
if ($request_uri ~ '\?{{variable}}') {
...
}
for example
if ($request_uri ~ '\?mobile') {
return 302 https://m.example.com;
}
Also I suggest consider use this redirection
http://{{domain}}.{{tld}}/mobile -> http://m.{{domain}}.{{tld}}
location ~ '/mobile'
return 301 'https://m.{{domain}}.{{tld}}';
}
for example
location ~ '/mobile'
return 301 'https://m.example.com';
}
Comments
You can try this to match your param
if ($args ~ '\bmobile[=&]?' )
{
return 302 http://m.example.com/;
}
as this will match 'mobile' anywhere in $args, with or without value.
if ($arg_mobile). Checking if there is empty argumentmobileis not so clear and error-prone.