Nginx access_log needs more detail - docker

Question

I have an issue with my webapp currently where it cannot submit a POST request. The request doesn't even make it past nginx.
When I looked at the access_log file, I saw this:
172.18.0.1 - - [22/Oct/2022:14:44:46 +0000] "POST /Manage/Message/Announcement/Update HTTP/1.1" 400 0
"http://localhost:9190/Manage/Message/Announcement/Edit/a4f91c12-ebd3-4c98-9544-41d3757770bf"
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/106.0.0.0 Safari/537.36"
It just says Error 400. However, I don't know what caused the error 400. My error_log file is empty.
How can I get more details out from my nginx access_log?
This is my conf file:
upstream gateway_us {
server sdr_gateway.web;
}
upstream manage_us {
server sdr_manage.web;
}
server {
listen 80;
server_name localhost;
server_tokens off;
add_header X-Frame-Options "SAMEORIGIN";
add_header X-XSS-Protection "1; mode=block";
error_log /var/log/nginx/sdr-fe-nginx-error.log debug;
access_log /var/log/nginx/sdr-fe-nginx-access.log;
ignore_invalid_headers off;
underscores_in_headers on;
location /{
proxy_pass http://gateway_us/;
proxy_set_header Authorization $http_authorization;
proxy_pass_header Authorization;
}
location /Gateway/{
proxy_pass http://gateway_us/;
proxy_set_header Authorization $http_authorization;
proxy_pass_header Authorization;
}
location /Manage/{
proxy_pass http://manage_us/Manage/;
proxy_set_header Authorization $http_authorization;
proxy_pass_header Authorization;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_http_version 1.1;
proxy_set_header X-NginX-Proxy true;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $http_connection;
proxy_cache_bypass $http_upgrade;
proxy_redirect off;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
A brief explanation of my webapp. It is a .net core web app and I want to submit a form using POST
I have changed the name of my antiforgery token and data protection key name to not contain any underscores or dots:
Data Protection Key Name:
SD-DPK-APP
Anti Forgery Token Name:
SD-AFT-APP
If it helps, this web app is running from a subdirectory. I have another app that is not in the subdirectory and it can perform POST requests fine.