How can I disable Symfony 5 class cache for local debugging? - symfony

Question

I'm working on a custom json api (no twig involved). During development, I need to keep making constant changes to the codebase, and every response gets cached for a few minutes or until I clrear the symfony cache.
I'm using a local nginx server, which should be properly configured since these are the headers I get:
Server: nginx/1.16.1
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
X-Powered-By: PHP/7.4.1
Cache-Control: max-age=0, private
Date: Fri, 24 Jul 2020 07:29:28 GMT
X-Debug-Token: f38aeb
X-Debug-Token-Link: http://localhost:8080/_profiler/f38aeb
X-Robots-Tag: noindex
Last-Modified: Friday, 24-Jul-2020 07:29:28 UTC
Cache-Control: private no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0
and responses are properly updated once I run bin/console c:c
I need to do this every time I change any class (controllers, services, models, whatever).
There must be something obvious I'm missing. Is there a way to disable class caching on my dev environment and not having to clear the cache for every little change?
Edited: adding relevant configuration.
This is my nginx .conf file:
server {
listen 80;
server_name ~.*;
location / {
root /app;
try_files $uri /index.php$is_args$args;
}
location ~ ^/index\.php(/|$) {
client_max_body_size 50m;
fastcgi_pass php:9000;
fastcgi_read_timeout 1800;
fastcgi_buffers 16 16k;
fastcgi_buffer_size 32k;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME /app/public/index.php;
# Disable cache
add_header Last-Modified $date_gmt;
add_header Cache-Control 'private no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
expires off;
etag off;
}
error_log /dev/stderr debug;
access_log /dev/stdout;
}

Answer 1

I finally found the culprit. I'll leave this in case someone faces the same issue. I had opcache enabled in my dev environment, so it had nothing to do with symfony or the nginx location. I just disabled opcache and the issue was fixed.
opcache.enable=0