Best Way To Remove Whole URL Query String

[Hadi Abbasi]

hello
when I wanna send request to origin server, I wanna try to remove whole url query string using openresty .
the first thing I can do is redirection. but it's not suggested way (seo problems)!
I thought I can remove url query string by below code but it's not working:
if  string.find(ngx.var.request_uri,"?",1, true) then
            local args = ngx.req.get_uri_args()
            for k , v in pairs(args) do
                args[k]=nil;
                --ngx.log(ngx.DEBUG,tostring(k) .. " --> " .. tostring(v))
            end
             ngx.req.set_uri_args(args)
            --return ngx.redirect(ngx.var.scheme .. "://" .. ngx.var.host..uri_without_query_str,  301)
        end
ngx.log(ngx.DEBUG,"============> " .. tostring(ngx.var.request_uri))
--nothing is changed
is there any way for me or the only way is redirection?
Best,
Hadi

[Kshitij Joshi]

Simply use 

ngx.var.uri. It does not contain any query strings.

[Andrei]

Blindly stripping query parameters from the requests going to the origin server is a horrible idea and has no positive bearing on SEO. On the contrary, the backend app will no longer be able to track utm_ params and unless all your Internal requests use post, I'm willing to bet some query params will be needed. If you're doing this to improve caching, there's always a better way.

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[Peter Booth]

Yes.

Open testy is a super powerful tool. The important question most if the time “what are you wanting to achieve, and why?” 

There are are often a dozen bad ways and only a couple of ideal ways to solve problems with Openresty. 

I haven’t yet found a web problem that openresty couldn’t help with, so I am a fanboy.

Sent from my iPhone

On Apr 24, 2021, at 2:25 PM, Andrei <lag...@gmail.com> wrote:



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[Hadi Abbasi]

kshiti...@gmail.com

 thanks a lot..
but I simply can remove query string in a simple function...
the problem is that openresty has its builtin mechanism and it will send full request by query string to the origin server!

[Kshitij Joshi]

How are you sending requests to the backend server? By proxy_pass?

By default vars like ngx.var.uri,  ngx.var.args etc are immutable. 

It's to generate local variables by copying those variables and then modifying them. 

[Hadi Abbasi]

some of my customers wants to ignore sending query string as they need maximum  use of valid caches and ignore ddos and ... attacks with random query strings. their site doesn't use query string.
so all I wanna say and do is to ignore sending query string to their origin server and also  ignore it in cacheid generation! in other words, I wanna remove full url query string of clients request for those customers!
but openresty builtin mechanism doesn't allow me to do that but just by redirection!
even I can't do that using:

if  string.find(ngx.var.request_uri,"?",1, true) then
            local args = ngx.req.get_uri_args()
            for k , v in pairs(args) do
                args[k]=nil;
                --ngx.log(ngx.DEBUG,tostring(k) .. " --> " .. tostring(v))
            end
             ngx.req.set_uri_args(args)
            --return ngx.redirect(ngx.var.scheme .. "://" .. ngx.var.host..uri_without_query_str,  301)
        end
ngx.log(ngx.DEBUG,"============> " .. tostring(ngx.var.request_uri))
--nothing is changed

[Hadi Abbasi]

kshiti...@gmail.com

proxy_pass

[Kshitij Joshi]

What are you using to cache?

You could simply proxy_pass to

proxy_pass $host$uri.

I'm sure there should be some way to set the cacheKey to $host$uri.

[Andrei]

Yup, just tac on $uri and look over the docs for info on how it can change across locations/rewrites

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[Hadi Abbasi]

lag...@gmail.com
kshiti...@gmail.com

yep, I will try it!
if it still sends query_string, I will continue  & will ask again!
thanks a lot...
Best,
Hadi

[Andrei]

Just read the docs on proxy_pass, $uri, $request_uri

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[Hadi Abbasi]

Sure..
thanks...
All The Best,
Hadi