Nginx – Redirect All POST/GET Requests to Another Domain

nginxredirect

My goal is to redirect all API requests (both GET or POST) from old-domain.com to new-domain.com but only from specific GET company_id value (ABC). We will still treat other requests other than that to old-domain.com.

For example :

old-domain.com/user/view/123?company_id=ABC

will be redirected to

new-domain.com/user/view/123?company_id=ABC.

But, I need all requests to these URLS to not be redirected.

old-domain.com/user/view/123?company_id=XYZ
old-domain.com/user/view/123
old-domain.com/other/api/as/well

Here is what I have made so far. 

if ($arg_company_id = ABC) {
    return 302 https://new-domain.com$request_uri;
}

All is working well but I face another issue. I also need to redirect all POST requests as well.

old-domain.com/user/update/123?company_id=XYZ
POST variables : name=John, phone_number=555123

The above request will only redirect the request, but not the POST data (the name=John, phone_number=555123 data is not sent to the new domain).

I have read about proxy_pass but that way is not working for a different domain.

I hope I can get some enlightment. Thank you.

UPDATE :
Thank you to Ivan's answer. I modify my conf to this (nginx doesn't support nested-if): 

    set $RR "";

    if ($arg_company_id = ABC) {
        set $RR R;
    }

    if ($request_method = GET) {
        set $RR "${RR}G";
    }

    if ($request_method = POST) {
        set $RR "${RR}P";
    }

    if ($RR = RG){
       return 302 https://new-domain.com$request_uri;
    }

    if ($RR = RP) {
        return 307 https://new-domain$request_uri;
    }

Best Answer

Try HTTP 307 redirect, it should keep POST request body:

if ($arg_company_id = ABC) {
    if ($request_method = GET) {
        return 302 https://new-domain.com$request_uri;
    }
    if ($request_method = POST) {
        return 307 https://new-domain.com$request_uri;
    }
}
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