ngx.req.set_uri_args behavior with escape sequences

[Arunabha Saha]

I'm using openresty to rewrite the query params in a URI. The way I
do it is of course to extra the query params, rewrite them and then
use ngx.req.set_uri_args() to set the query params. What I notice is
that it unescapes the URI also.

For the website I was having issues with, the URL is of the form
https://host/uri?query=x

Here uri is actually json that is run through a url encoder to escape
it. When I try to rewrite the query=x part using
ngx.req.set_uri_args(), I'm running into an issue where uri is now
transformed back into its original json and breaks the request.

I have worked around it by copying $request_uri to $orig_uri and
encoding the proxy_pass as something like proxy_pass
https://host$orig_uri$rewrite_args (i set $rewrite_args instead of
using ngx.req.set_uri_args). However, was wondering if there is
something I am missing here that would avoid the need for this
workaround.

--
regards,
Arun

[DeJiang Zhu]

Hi Arun,

I can reproduce it on my side. Maybe it's by design in Nginx. Anyway, I will take a deep look at it soon.

result:

```

# original server

$ curl 'http://127.0.0.1:8098/%7B%22f%20o%20%23%5C%2F%22%3A%22%20bar%20%40%3F%20%22%7D?query=x'
uri: /{"f o #\/":" bar @? "}
request_uri: /%7B%22f%20o%20%23%5C%2F%22%3A%22%20bar%20%40%3F%20%22%7D?query=x

# server with rewrite

$ curl 'http://127.0.0.1:8099/%7B%22f%20o%20%23%5C%2F%22%3A%22%20bar%20%40%3F%20%22%7D?query=x'
uri: /{"f o #\/":" bar @? "}
request_uri: /{"f%20o%20%23\/":"%20bar%20@%3F%20"}?query=rewrite

```

with the following configuration:

```

    server {
        listen       8098;

        location / {
            content_by_lua_block {
                ngx.say("uri: ", ngx.var.uri)
                ngx.say("request_uri: ", ngx.var.request_uri)
            }
        }
    }

    server {
        listen       8099;

        location / {
            rewrite_by_lua_block {
                ngx.req.set_uri_args("query=rewrite")
            }
            proxy_pass http://local;
        }

        location /hello {
            content_by_lua_block {
                local body = "hello"
                ngx.header['Content-Length'] = #body + 1
                ngx.say(body)
            }
        }

    }

````

--

regards,

doujiang24

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