adding query string to redirect ?

[Jonathan Vanasco]

we'd like to add onto the query string an identifier of the nginx server

something like:

	return 301 https://$host$request_uri?source=server1 ;

the problem is that we can't figure out how to make this work correctly when the url already contains query strings.


Example:
	return 301 https://$host$request_uri?source=server1 ;
	Good!
		in  /foo.bar 
		out /foo.bar?source=server1
	Bad!
		in  /foo.bar?a=1
		out /foo.bar?a=1?source=server1

How can we get this?

		in  /foo.bar 
		out /foo.bar?source=server1

		in   /foo.bar?a=1
		out /foo.bar?a=1&source=server1


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