58 lines
1.6 KiB
Markdown
58 lines
1.6 KiB
Markdown
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---
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title: Nginx Redirects With Query String Arguments
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date: 2017-01-31
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excerpt: How to redirect from an old domain to a new one, and also to redirect from the root example.com domain to the canonical www subdomain.
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tags:
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- nginx
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---
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This is an example of how my Nginx configuration looked to redirect from an old
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domain to a new one, and also to redirect from the root `example.com` domain to
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the canonical `www` subdomain.
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```nginx
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server {
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listen 80;
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server_name example.com;
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server_name my-old-domain.com;
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server_name www.my-old-domain.com;
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return 301 https://www.example.com$uri;
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}
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```
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It also redirects the URI value, e.g. from `http://example.com/test` to
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`http://example.com/test`, but I noticed recently though that any the query
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string would be lost - e.g. `http://example.com/?test` would redirect to
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`http://www.example.com` and the `?test` would be dropped. The application that
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I built references images based on the query string, so I wanted these to be
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included within the redirect.
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This was fixed by making a small change to my `return` statement.
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Before:
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```nginx
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return 301 https://www.example.com$uri;
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```
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After:
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```nginx
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return 301 https://www.example.com$uri$is_args$args;
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```
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`$is_args` is an empty string if there are no arguments, or a `?` to signify the
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start of the query string. `$args` then adds the arguments (`$query_string`
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could also be used with the same result).
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Here is an demo of it working on this website:
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## Resources
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- [Query string](https://en.wikipedia.org/wiki/Query_string)
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- [Nginx ngx_http_core_module](http://nginx.org/en/docs/http/ngx_http_core_module.html)
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