Logging POST body (request and response) with ingress-nginx - nginx-location

Question

It seems that out of the box ngx_http_core_module should log request_body if it's part of the log_format.
However, Im not seeing this working for anything that includes auth_request in location block. Im not entirely sure what causes it. It appears to work fine for location blocks that do not include auth_request directive.
Typical the generated location block would look like,
server {
server_name test-api.dummy.co ;
listen 80 ;
listen 443 ssl http2 ;
set $proxy_upstream_name "-";
ssl_certificate_by_lua_block {
certificate.call()
}
proxy_pass_request_body on;
access_log /var/log/nginx/access.log custom_api_log;
location ~* "^/api/v2/management/customer/[a-zA-Z0-9-]+/" {
set $namespace "control";
set $ingress_name "apps-public-gateway-api-ig-auth";
set $service_name "istio-ingressgateway";
set $service_port "80";
set $location_path "/api/v2/management/customer/[a-zA-Z0-9-]+/";
rewrite_by_lua_block {
lua_ingress.rewrite({
force_ssl_redirect = true,
ssl_redirect = true,
force_no_ssl_redirect = false,
use_port_in_redirects = false,
})
balancer.rewrite()
plugins.run()
}
# be careful with `access_by_lua_block` and `satisfy any` directives as satisfy any
# will always succeed when there's `access_by_lua_block` that does not have any lua code doing `ngx.exit(ngx.DECLINED)`
# other authentication method such as basic auth or external auth useless - all requests will be allowed.
#access_by_lua_block {
#}
header_filter_by_lua_block {
lua_ingress.header()
plugins.run()
}
body_filter_by_lua_block {
}
log_by_lua_block {
balancer.log()
monitor.call()
plugins.run()
}
port_in_redirect off;
set $balancer_ewma_score -1;
set $proxy_upstream_name "control-istio-ingressgateway-80";
set $proxy_host $proxy_upstream_name;
set $pass_access_scheme $scheme;
set $pass_server_port $server_port;
set $best_http_host $http_host;
set $pass_port $pass_server_port;
set $proxy_alternative_upstream_name "";
# this location requires authentication
auth_request /_external-auth;
auth_request_set $auth_cookie $upstream_http_set_cookie;
add_header Set-Cookie $auth_cookie;
auth_request_set $authHeader0 $upstream_http_authorization;
proxy_set_header 'Authorization' $authHeader0;
# Cors Preflight methods needs additional options and different Return Code
if ($request_method = 'OPTIONS') {
more_set_headers 'Access-Control-Allow-Origin: https://test-portal.dummy.co';
more_set_headers 'Access-Control-Allow-Credentials: true';
more_set_headers 'Access-Control-Allow-Methods: GET, PUT, POST, DELETE, PATCH, OPTIONS';
more_set_headers 'Access-Control-Allow-Headers: DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
more_set_headers 'Access-Control-Max-Age: 3600';
more_set_headers 'Content-Type: text/plain charset=UTF-8';
more_set_headers 'Content-Length: 0';
return 204;
}
more_set_headers 'Access-Control-Allow-Origin: https://test-portal.dummy.co';
more_set_headers 'Access-Control-Allow-Credentials: true';
more_set_headers 'Access-Control-Allow-Methods: GET, PUT, POST, DELETE, PATCH, OPTIONS';
more_set_headers 'Access-Control-Allow-Headers: DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
client_max_body_size 1m;
proxy_set_header Host $best_http_host;
# Pass the extracted client certificate to the backend
# Allow websocket connections
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_set_header X-Request-ID $req_id;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Proto $full_x_forwarded_proto;
proxy_set_header X-Forwarded-Host $best_http_host;
proxy_set_header X-Forwarded-Port $pass_port;
proxy_set_header X-Scheme $pass_access_scheme;
# Pass the original X-Forwarded-For
proxy_set_header X-Original-Forwarded-For $http_x_forwarded_for;
# mitigate HTTPoxy Vulnerability
# https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
proxy_set_header Proxy "";
# Custom headers to proxied server
proxy_connect_timeout 5s;
proxy_send_timeout 60s;
proxy_read_timeout 60s;
proxy_buffering off;
proxy_buffer_size 4k;
proxy_buffers 4 4k;
proxy_max_temp_file_size 1024m;
proxy_request_buffering on;
proxy_http_version 1.1;
proxy_cookie_domain off;
proxy_cookie_path off;
# In case of errors try the next upstream server before returning an error
proxy_next_upstream error timeout;
proxy_next_upstream_timeout 0;
proxy_next_upstream_tries 3;
proxy_pass http://upstream_balancer;
proxy_redirect http://test-api.dummy.co https://test-api.dummy.co;
}
}
Is this achievable via a Lua script perhaps if we cannot achieve this out of the box ?
And how to go about logging the response body without having a custom template for ingress-nginx controller ?
Thanks in advance.