htaccess redirect whilst parsing query string and variable

Question

How do you redirect a subdomain whilst capturing anything after the '?' and appending to a redirect using htaccess, whilst maintaining a particular variable?

redirect from...

http://subdomain1.example.com/?retailcentre=subdomain1&utm_source=twitter&utm_medium=twitter&utm_campaign=022641example

to...

http://www.example.com/?retailcentre=subdomain1&utm_source=twitter&utm_medium=twitter&utm_campaign=022641example

The query string after the '?' could be anything as it could come from twitter, facebook etc.

The one var that has to be parsed is what subdomain the redirect came from, in this case 'retailcentre'.

Croises · Accepted Answer · 2016-09-06 12:52:41Z

2

Try with:

RewriteEngine on 
RewriteCond %{HTTP_HOST} ^subdomain1\.example\.com$ [NC]
RewriteRule ^ http://www.example.com%{REQUEST_URI}?retailcentre=subdomain1 [QSA,NE,R=301,L]

[QSA] Flag: When the replacement URI contains a query string, the default behavior of RewriteRule is to discard the existing query string, and replace it with the newly generated one. Using the [QSA] flag causes the query strings to be combined.

edited Sep 6, 2016 at 12:52

answered Sep 5, 2016 at 17:17

Croises

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4 Comments

Amesey Over a year ago

Thanks, this is close but is missing the 'retailcentre' variable. The value for this variable is taken from the subdomain part of the URL, so the '?retailcentre=subdomain1' part is followed by the query string in the original URL. is this possible?

Amesey Over a year ago

I nearly got this to work, i've used the following... RewriteRule ^ http://www.example.com/?retailcentre=subdomain1$1%{REQUEST_URI} [QSA,NE,R=301,L] ... but it adds a %2F after the value of 'retailcentre'.

Amesey Over a year ago

So my reditected URL looks like this

http://www.example.com/?retailcentre=subdomain1%2F&utm_source=email&utm_medium=email&utm_campaign=022641ReservedEventCustomerEmail

. I want to remove the %2F

Croises Over a year ago

Retailcentre is in your "redirect from" exemple... I edit my code with that.

Amit Verma · Accepted Answer · 2016-09-05 17:31:31Z

0

You can use the following rules :

RewriteEngine on

RewriteCond %{HTTP_HOST} !^www\.example\.com$
RewriteCond %{THE_REQUEST} /\?retailcentre=.+&utm_source=.+&utm_medium=.+&utm_campaign=.+\sHTTP [NC]
RewriteRule ^ http://example.com/ [L,R,NE]

answered Sep 5, 2016 at 17:31

Amit Verma

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1 Comment

Amesey Over a year ago

This won't work in this scenario because I have to capture anything that comes after the '?' and not specific variables as you have.

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