Nginx rewrite rules with query string arguments

Question

Here are my nginx rewrite rules

rewrite ^(.*)$ http://www.destination.com/main.php?utm_source=xxx&utm_medium=yyy&utm_campaign=zzz permanent;

Everything works so far except when there's query arguments.

This is a permanent 301 redirect, and I need to configure the case when there's query string, it will be appended before the utm tracking query.

How do I do this while also taking care of rewrite without query string?

eg.

http://www.from.com/?test=ABC

goes to

http://www.destination.com/main.php?test=ABC&utm_source=xxx&utm_medium=yyy&utm_campaign=zzz

instead of

http://www.destination.com/main.php?utm_source=xxx&utm_medium=yyy&utm_campaign=zzz&test=ABC

Richard Smith · Accepted Answer · 2016-04-14 22:04:20Z

2

You can insert the query arguments manually, but you will need to use a map to calculate whether an & separator is required.

The map should be placed in the http block:

map $is_args $separator {
    default "";
    "?"     "&";
}

The rewrite would then look something like this:

rewrite ^(.*)$ /some/url.php?$args${separator}q=$1? permanent;

See this document for details.

answered Apr 14, 2016 at 22:04

Richard Smith

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3 Comments

KDX Over a year ago

Works perfect. Can you elaborate what the map block where "?" and "&" do? Is map applying certain condition here?

Richard Smith Over a year ago

@KDX the $is_args variable is set to "?" if a query string is present. We need to map that to a "&" to join our argument to the existing query string ($args) unless it's empty.

KDX Over a year ago

Is that meant $separator will be "" if there's no query string? If there's is query string, $separator will become "&". Am I understanding correctly?

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