request help: how to rewrite query parameters using proxy-rewrite

[zTrix]

Issue description

'?' symbol would be encoded to 0x3f when using proxy-rewrite directive.

https://github.com/apache/incubator-apisix/blob/794b1eb65e01e0e15d3dcd9cf1f0d74166e9b246/apisix/plugins/proxy-rewrite.lua#L156

Is there any way to rewrite url to append some more query parameter to the original path?

It would be highly appreciated if rewriting query parameter could be supported like in nginx: https://serverfault.com/questions/311487/nginx-rewrite-append-a-parameter-at-the-end-of-an-url

Environment

• apisix version (cmd: 1.3):
• OS: Linux

[membphis]

this should be a bug, we should only encode uri.

here is the fake code, welcome PR ^_^

local path, arg = split_uri(uri)
path = uri_safe_encode(path)
return path .. arg

[xxm404]

Hi @moonming you can assign this issue to me.