API Documentation on NGINX server - json

Question

I have a Fastapi running on localhost:8020 and I have access to documentation with:localhost:8020/docs and the openapi.json file is in localhost:8020/openapi.json.
I want to redirect localhost:8020/docs to localhost:8080/docs with nginx. Here is my nginx.conf:
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log notice;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
sendfile on;
upstream docss {
server 172.17.0.1:8020;
}
server {
client_max_body_size 500M;
proxy_connect_timeout 600;
proxy_send_timeout 600;
proxy_read_timeout 600;
send_timeout 600;
client_body_timeout 600;
listen 8080;
resolver 127.0.0.11;
autoindex off;
server_name localhost;
server_tokens off;
location /docs/ {
proxy_pass http://docss/docs;
}
}
}
with the above config, when I open localhost:8080/docs/, I receive this error:
Failed to load API definition. Errors Hide Fetch error Not Found
/openapi.json
and in the nginx docker log, I receive this error:
172.21.0.1 - - [23/Jun/2022:18:10:35 +0000] "GET /docs/ HTTP/1.1" 200 931 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36"
2022/06/23 18:10:36 [error] 23#23: *1 open()
"/etc/nginx/html/openapi.json" failed (2: No such file or directory),
client: 172.21.0.1, server: localhost, request: "GET /openapi.json
HTTP/1.1", host: "localhost:8080", referrer:
"http://localhost:8080/docs/"
172.21.0.1 - - [23/Jun/2022:18:10:36 +0000] "GET /openapi.json HTTP/1.1" 404 548 "http://localhost:8080/docs/" "Mozilla/5.0 (Windows
NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/102.0.0.0 Safari/537.36"
I guess it means that it couldnot find openapi.json at "/etc/nginx/html/openapi.json".
So my question is that how can I import 172.17.0.1:8020/openapi.json which is the upstream connection to "/etc/nginx/html/openapi.json".
This is the command I use to create nginx docker:
docker run --link ds-ai-ocr_web_1 --link ds-ai-ocr_api_1 --net ds-ai-ocr_default --name nginx -v c:/Users/ab/Documents/ds-nginx-conf:/etc/nginx -p 8080:8080 -d nginx
I guess I should mount openapi.json through this command but it doesn't work like this:
docker run --link ds-ai-ocr_web_1 --link ds-ai-ocr_api_1 --net ds-ai-ocr_default --name nginx -v c:/Users/amd/Documents/ds-nginx-conf:/etc/nginx -v http://172.17.0.1:8020/openapi.json:/etc/nginx/html -p 8080:8080 -d nginx