When rewriting a url with the rewrite directive, is it possible to save the
original url in a request header for the downstream handler?

Similar to the X-Rewrite-URL header built in to ISAPI rewrite.
Or in Apache, I can do it with something like:

#== Capture original uri and query string into environment variable so it
can be put in a header
#== Match non-empty query string
RewriteCond %{QUERY_STRING} (^.+$)
RewriteRule (.*) $1 [E=x-rewrite-url:$1?%1]

If this is possible in nginx, how would I do it?

Thanks
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