res.location(path)
Sets the response Location HTTP header to the specified path parameter.
res.location('/foo/bar');
res.location('http://example.com');
res.location('back');
A path value of “back” has a special meaning, it refers to the URL specified in the Referer header of the request. If the Referer header was not specified, it refers to “/”.
Express passes the specified URL string as-is to the browser in the Location header, without any validation or manipulation, except in case of back.
Browsers take the responsibility of deriving the intended URL from the current URL or the referring URL, and the URL specified in the Location header; and redirect the user accordingly.
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