503 : Service Unavailable

ZW3B’s LAB3W : The Web’s Laboratory ; Engineering of the Internet.

This page uses zw3bApiClient 7.1.2 v0.1 Authentification - Test phase : Interconnections.

¿WHAT's? (◕‿◕) - LB

Client Address : 18.97.9.169

Via : fc00:5300:60:9389:15:1:0:f - Frontend : SRV-CA

Response Backend SERVER_ADDR : fc00:5300:60:9389:15:1:a:10 - VHOST : www.zw3b.tv

Looking for how to do it :

• I can't seem to capture the correct headers x-forwarded-for ; x-forwarded-host ; x-forwarded-server that I'm sending from the front end ; The one we see in our browsers.
  - So ; x-forwarded-server for the VHOST ; x-forwarded-host for the name in the URL ; x-forwarded-for for the client's IP address.
• I can't see my custom headers on the backends x-zw-backnode ; x-zw-head ; x-zw-lb-ipv4 ; x-zw-lb-ipv6 ; x-zw-lb-name.

Worth checking ; Is there a bug ?

$_COOKIE => Array
(
)

apache_request_headers() => Array
(
    [Content-Length] => 0
    [Host] => zw3b.tv
    [X-Forwarded-Server] => www.zw3b.tv
    [X-Forwarded-Host] => zw3b.tv
    [X-Forwarded-For] => 18.97.9.169
    [Te] => trailers
    [Accept-Encoding] => zstd, br, gzip
    [If-Modified-Since] => Sat, 16 May 2026 04:58:17 GMT
    [Accept-Language] => en-US,en;q=0.5
    [Accept] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    [User-Agent] => CCBot/2.0 (https://commoncrawl.org/faq/)
)

headers_list() => Array
(
)

$_SERVER => Array
(
    [USER] => www-data
    [HOME] => /var/www
    [SCRIPT_NAME] => /app.php
    [REQUEST_URI] => /music/r-n-b/?t=dark
    [QUERY_STRING] => t=dark
    [REQUEST_METHOD] => GET
    [SERVER_PROTOCOL] => HTTP/2.0
    [GATEWAY_INTERFACE] => CGI/1.1
    [REDIRECT_QUERY_STRING] => t=dark
    [REDIRECT_URL] => /music/r-n-b/
    [REMOTE_PORT] => 41304
    [SCRIPT_FILENAME] => /var/pro/web_sites/zw3b_tv/www/web/app.php
    [SERVER_ADMIN] => roots@zw3b.tv
    [CONTEXT_DOCUMENT_ROOT] => /var/pro/web_sites/zw3b_tv/www/web/
    [CONTEXT_PREFIX] => 
    [REQUEST_SCHEME] => https
    [DOCUMENT_ROOT] => /var/pro/web_sites/zw3b_tv/www/web/
    [REMOTE_ADDR] => fc00:5300:60:9389:15:1:0:f
    [SERVER_PORT] => 443
    [SERVER_ADDR] => fc00:5300:60:9389:15:1:a:10
    [SERVER_NAME] => zw3b.tv
    [SERVER_SOFTWARE] => Apache
    [SERVER_SIGNATURE] => 
    [PATH] => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    [CONTENT_LENGTH] => 0
    [HTTP_HOST] => zw3b.tv
    [HTTP_X_FORWARDED_SERVER] => www.zw3b.tv
    [HTTP_X_FORWARDED_HOST] => zw3b.tv
    [HTTP_X_FORWARDED_FOR] => 18.97.9.169
    [HTTP_TE] => trailers
    [HTTP_ACCEPT_ENCODING] => zstd, br, gzip
    [HTTP_IF_MODIFIED_SINCE] => Sat, 16 May 2026 04:58:17 GMT
    [HTTP_ACCEPT_LANGUAGE] => en-US,en;q=0.5
    [HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    [HTTP_USER_AGENT] => CCBot/2.0 (https://commoncrawl.org/faq/)
    [proxy-nokeepalive] => 1
    [SSL_TLS_SNI] => zw3b.tv
    [HTTPS] => on
    [H2_STREAM_TAG] => 7884-20-117
    [H2_STREAM_ID] => 117
    [H2_PUSHED_ON] => 
    [H2_PUSHED] => 
    [H2_PUSH] => off
    [H2PUSH] => off
    [HTTP2] => on
    [forwarded] => 1
    [QS_ConnectionId] => 17861004800962832707884
    [REDIRECT_STATUS] => 200
    [REDIRECT_SSL_TLS_SNI] => zw3b.tv
    [REDIRECT_HTTPS] => on
    [REDIRECT_H2_STREAM_TAG] => 7884-20-117
    [REDIRECT_H2_STREAM_ID] => 117
    [REDIRECT_H2_PUSHED_ON] => 
    [REDIRECT_H2_PUSHED] => 
    [REDIRECT_H2_PUSH] => off
    [REDIRECT_H2PUSH] => off
    [REDIRECT_HTTP2] => on
    [REDIRECT_forwarded] => 1
    [REDIRECT_QS_ConnectionId] => 17861004800962832707884
    [FCGI_ROLE] => RESPONDER
    [PHP_SELF] => /app.php
    [REQUEST_TIME_FLOAT] => 1786100480.0981
    [REQUEST_TIME] => 1786100480
)