I made a node js express code that allow me to connect to a server ( reverse proxy ) from apache , so I made this script to when I go to the url it logged in automatically , but it display this error :

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at ClientRequest.setHeader (node:_http_outgoing:703:11)
at ProxyServer. (file:///Users/mohamedyassinemessaoud/Documents/Yassine/PFE/Backend/server.js:87:12)

my code is like that

Code Nodejs

import httpProxy from 'http-proxy';
let serverProxy = httpProxy.createProxyServer();

const username = 'anthony';
const password = 'anthony';
const basicAuth = 'Basic ' + Buffer.from(`${username}:${password}`).toString('base64');

serverProxy.on('proxyReq', function(proxyReq, req, res) {
  // Set headers before sending the response
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');
  res.setHeader('Access-Control-Allow-Credentials', true);

  // Set Authorization header for Basic Auth if body is present
  if (!proxyReq.getHeader('Content-Length') && req.body) {
    const bodyData = JSON.stringify(req.body);
    proxyReq.setHeader('Content-Type', 'application/json');
    proxyReq.setHeader('Content-Length', Buffer.byteLength(bodyData));
    proxyReq.write(bodyData);
  }

  // Set Basic Auth header
  proxyReq.setHeader('Authorization', basicAuth);
});

app.all('/dashboard(/*)?', (req, res) => {
  console.log("Rewritten URL:", req.url);
  serverProxy.web(req, res, {
    target: 'http://localhost:80',
    prependPath: false
  });
});

and my httpd.conf from apache server ::

ServerRoot "/usr/local/apache2"
Listen 80

# Load MPM module - choose one based on your needs
LoadModule mpm_event_module modules/mod_mpm_event.so

LoadModule authn_file_module modules/mod_authn_file.so
LoadModule authn_core_module modules/mod_authn_core.so
LoadModule authz_host_module modules/mod_authz_host.so
LoadModule authz_user_module modules/mod_authz_user.so
LoadModule authz_core_module modules/mod_authz_core.so
LoadModule auth_basic_module modules/mod_auth_basic.so
LoadModule log_config_module modules/mod_log_config.so
LoadModule env_module modules/mod_env.so
LoadModule headers_module modules/mod_headers.so
LoadModule unixd_module modules/mod_unixd.so
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so

<IfModule unixd_module>
User daemon
Group daemon
</IfModule>

ServerAdmin localhost

<Directory />
    AllowOverride none
    Require all denied
    Header set Access-Control-Allow-Origin "*"
    Header set Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
    Header set Access-Control-Allow-Headers "Content-Type, Authorization"

</Directory>

DocumentRoot "/usr/local/apache2/htdocs"

ErrorLog /proc/self/fd/2
LogLevel error

<IfModule log_config_module>
    LogFormat "%h %l %u %t "%r" %>s %b "%{Referer}i" "%{User-Agent}i"" combined
    LogFormat "%h %l %u %t "%r" %>s %b" common
    <IfModule logio_module>
      LogFormat "%h %l %u %t "%r" %>s %b "%{Referer}i" "%{User-Agent}i" %I %O" combinedio
    </IfModule>
    CustomLog /proc/self/fd/1 common
</IfModule>
<IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin "*"
    Header set Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
    Header set Access-Control-Allow-Headers "Authorization, Content-Type"
</IfModule>

<Proxy *>
    AuthType Basic
    AuthName "GrafanaAuthProxy"
    AuthBasicProvider file
    AuthUserFile "/tmp/htpasswd"
    Require valid-user
    RewriteEngine On
    RewriteRule .* - [E=PROXY_USER:%{LA-U:REMOTE_USER},NS]
    RequestHeader set X-WEBAUTH-USER "%{PROXY_USER}e"
</Proxy>

RequestHeader unset Authorization
ProxyRequests Off
ProxyPass / http://grafana:3000/
ProxyPassReverse / http://grafana:3000/

how to fix it emergency please, and thanks