Nginx looking for files instead of URI when proxying - nginx

Question

I'm trying to setup nginx as reverse proxy.
When I using just this simple config, all works well.
location / {
proxy_pass https://domain.name;
proxy_ssl_server_name on;
}
But in my case I have a legacy API and a lot of conditions, and when I using more complex prefix, regex or exact match in case, when my URI looks like this one:
/v1/Server.ashx?parameter=value
nginx looking for file Server.ashx in default root folder "/usr/share/nginx/html/v1/Server.ashx" instead of proxying, and returns 404.
How can I fix this problem?

Answer 1

In my case, this approach helped.
Open for any other advices.
server{
listen 8111;
server_name 192.168.137.43;
location /v1/Server.ashx {
error_page 418 = #specificpage;
error_page 419 = #websocket;
if ($query_string = "parameter=value") {
return 418;
}
if ($query_string = "") {
return 419;
}
if ($query_string = "otherparameter=othervalue") {
return 419;
}
proxy_pass https://domain.name;
proxy_ssl_server_name on;
}
location / {
error_page 419 = #websocket;
if ($request_uri = "/v2") {
return 419;
}
if ($request_uri = "/v2?parameter=value") {
return 419;
}
proxy_pass https://domain.name;
proxy_ssl_server_name on;
}
location #specificpage {
proxy_pass https://other.domain.name;
proxy_ssl_server_name on;
}
location #websocket {
proxy_pass http://domain.name;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_set_header Host $host;
}
}