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I am using nginx as reverse proxy and I have 2 rules like:

location ~ ^/indirect {
  rewrite ^/indirect(.*) /foobar$1;

location ~ ^/foobar {
  set $url$scheme://$host$uri;
  proxy_pass $url;

So, as you can see I'm passing the $uri variable as a parameter to the proxied page (the $uri variable is an nginx one, see the http core module documentation).

Problem is, if I visit, the $uri variable contains /foobar/hello world (as you see, the %20 has been substituted with its url-decoded value, a space). And then, nginx returns http status code 400 (bad request) before executing the proxy_pass line (the backend there is not contacted).

There is also available the variable $request_uri, which holds the original request URI as issued by the client, so in this case it would hold the correct value, with the %20 sequence. But I cannot use this because if a client goes through the /indirect path, $request_uri would contain /indirect/... while I want that the access param passed to the backend be always /foobar/....

There are multiple indirect-like rules (this is for a DAV/calDAV/cardDAV server, and there are multiple clients out there that connect to multiple paths, so I need these indirect-like rules), so it is not feasible to do the proxy_pass there, and there are clients that go directly to the /foobar path.

So is there any way to get $uri without url-decoding it?

possible things that aren't acceptable:

  • sending the request double-encoded, as the request may come from a client I have no control of
  • specifying the final url multiple times in eacy indirect rule and also in the "direct" one, as it causes maintenance problems.
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This whole setup is its own maintenance problem. So I'm not sure why you would reject a solution because it might be a "maintenance problem". – Michael Hampton Nov 5 '12 at 16:52
@MichaelHampton yes, you are right, but if it's possible I don't want to make it even less maintainable – Carlos Campderrós Nov 6 '12 at 8:15
Finally I ended doing external 301 redirects from all the indirect uri's to the direct one, and only having the proxy_pass there. Should I answer my own question with this workaround? – Carlos Campderrós Nov 12 '12 at 9:39

1 Answer 1

The only way I found is to use the HttpSetMiscModule like so:

location ~
 ^/indirect {
  set_escape_uri $key $1;
  rewrite ^/indirect(.*) /foobar$key;

location ~ ^/foobar {
  set_escape_uri $key $uri;
  set $url$scheme://$host$key;
  proxy_pass $url;

If anyone knows of a better way (without having to compile nginx with external modules, because I don't have root access) please let me know!

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