What is the syntax for the 'Query string value' in a view argument input? down vote favorite
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In Views (3.3) you have the possibility to provide an argument input once you set up a relationship and a contextual filter. One option is to get this argument from the Query string value.

I tried it with visiting a link like this:

....url_to_view_page?argument=foo


and also

....url_to_view_page?foo


and even

....url_to_view_page?q=foo


But it doesn't seem to work. What is the correct syntax for this in the URL?
Syntax depends on your view display path, e.g. for page displays.

For example, if your page display path is url_to_view_page/% then the syntax is: 

url_to_view_page/foo.

If you do not have a path, then you'll always fall back on the contextual filter not provided behavior, this is always the case for blocks.