PHP Notice: Undefined index HTTP_HOST

  • Hi,
    I read a lot about this php warnings that we often found in the debug.log file:

    PHP Notice: Undefined index HTTP_HOST

    In the other forum posts the problem is always related to a specific plugin, but in this case I would like to highlight that these warnings are also related to wordpress core.

    This is an exmaple of the warnings I found everyday in the debug.log file. To collect more information about the request I have traced the $_SERVER variables, But I do not understand why wordpress throws these warnings.
    (N.B. real server path, folder and uri has been removed).

    [20-Jul-2020 07:26:19 UTC] Array
(
    [SERVER_SOFTWARE] => Apache
    [REQUEST_URI] => /
    [PHP_INI_SCAN_DIR] => 
    [PATH] => /usr/local/jdk/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/usr/local/bin:/usr/X11R6/bin:/root/bin:/opt/bin
    [PWD] => /usr/local/cpanel/cgi-sys
    [TZ] => Europe/Rome
    [SHLVL] => 0
    [MAGICK_THREAD_LIMIT] => 1
    [PHP_FCGI_MAX_REQUESTS] => 150000
    [HTTP_CONNECTION] => close
    [SCRIPT_NAME] => /index.php
    [QUERY_STRING] => 
    [REQUEST_METHOD] => GET
    [SERVER_PROTOCOL] => HTTP/1.0
    [GATEWAY_INTERFACE] => CGI/1.1
    [REMOTE_PORT] => 64315
    [SCRIPT_FILENAME] => /home/xxxx/public_html/index.php
    [SERVER_ADMIN] => [email protected]
    [CONTEXT_DOCUMENT_ROOT] => /home/myfolder/public_html
    [CONTEXT_PREFIX] => 
    [REQUEST_SCHEME] => http
    [DOCUMENT_ROOT] => /home/myfolder/public_html
    [REMOTE_ADDR] => 45.76.157.210
    [SERVER_PORT] => 80
    [SERVER_ADDR] => my server ip address
    [SERVER_NAME] => my server name
    [SERVER_SIGNATURE] => 
    [SCRIPT_URI] => my server uri
    [SCRIPT_URL] => /
    [UNIQUE_ID] => XxVHG8twg@6e5mHOH0R6CAAAAHM
    [FCGI_ROLE] => RESPONDER
    [PHP_SELF] => /index.php
    [REQUEST_TIME_FLOAT] => 1595229979.61
    [REQUEST_TIME] => 1595229979
    [argv] => Array
        (
        )

    [argc] => 0
)

[20-Jul-2020 07:26:19 UTC] PHP Notice:  Undefined index: HTTP_HOST in /home/myfolder/public_html/wp-includes/ms-settings.php on line 57
[20-Jul-2020 07:26:20 UTC] PHP Notice:  Undefined index: host in /home/myfolder/public_html/wp-includes/canonical.php on line 536
[20-Jul-2020 07:26:20 UTC] PHP Notice:  Undefined index: host in /home/myfolder/public_html/wp-includes/canonical.php on line 537
[20-Jul-2020 07:26:20 UTC] PHP Notice:  Undefined index: host in /home/myfolder/public_html/wp-includes/canonical.php on line 537
[20-Jul-2020 07:26:20 UTC] PHP Notice:  Undefined index: host in /home/myfolder/public_html/wp-includes/canonical.php on line 538
[20-Jul-2020 07:26:20 UTC] PHP Notice:  Undefined index: host in /home/myfolder/public_html/wp-includes/canonical.php on line 541

    I mean, why wordpress does not check if http_host exists before using it?
    And more specifically, which could be the origin of the problem?
    Maybe would be a security concern?

    I ‘ve also read that this warnings could be related to a connection made without a browser.
    Any help would be appreciated, thanks in advance.

Viewing 1 replies (of 1 total)

  • For wp-includes/canonical.php 536
    Change

    if ( strtolower( $original['host'] ) == strtolower( $redirect['host'] ) ||
		( strtolower( $original['host'] ) != 'www.' . strtolower( $redirect['host'] ) && 'www.' . strtolower( $original['host'] ) != strtolower( $redirect['host'] ) ) ) {
		$redirect['host'] = $original['host'];
	}

    to

    if ( ! isset( $original['host'] ) ) {
// fixing notice host
$original['host'] = '';
}
if ( strtolower( $original['host'] ) == strtolower( $redirect['host'] ) ||
		( strtolower( $original['host'] ) != 'www.' . strtolower( $redirect['host'] ) && 'www.' . strtolower( $original['host'] ) != strtolower( $redirect['host'] ) ) ) {
		$redirect['host'] = $original['host'];
	}

    For ms-settings.php i’m at the work

    • This reply was modified 4 years, 7 months ago by autotutorial.
Viewing 1 replies (of 1 total)
  • The topic ‘PHP Notice: Undefined index HTTP_HOST’ is closed to new replies.