[wp-trac] [WordPress Trac] #39128: Customize: Preview fails to load when domain mapping in use (home/siteurl domain mismatch)

[WordPress Trac]

#39128: Customize: Preview fails to load when domain mapping in use (home/siteurl
domain mismatch)
--------------------------+-----------------------
 Reporter:  RomainVB      |       Owner:
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  4.7.3
Component:  Customize     |     Version:  4.7
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
--------------------------+-----------------------

Comment (by westonruter):

 @mikewagz I'm not able to reproduce the issue on my local multisite setup.
 Are you saying your primary site has its `home` set to `www.mydomain.com`
 whereas its `siteurl` is `hosting.mydomain.com`? If so, how do you have
 this mapping applied?

 My `wp-config.php` is similarly configured as you:

 {{{#!php
 <?php
 define( 'WP_ALLOW_MULTISITE', true );
 define( 'MULTISITE', true );
 define( 'SUBDOMAIN_INSTALL', true );
 $base = '/';
 define( 'DOMAIN_CURRENT_SITE', 'src.wordpress-develop.dev' );
 define( 'PATH_CURRENT_SITE', '/' );
 define( 'SITE_ID_CURRENT_SITE', 1 );
 define( 'BLOG_ID_CURRENT_SITE', 1 );
 }}}

 My primary site's frontend is accessed via http://src.wordpress-
 develop.dev
 My sub-site's frontend is accessed via http://a.src.wordpress-develop.dev
 (Note the `a` subdomain for the sub-site.)

 I am able to access the customizer preview on my primary site: http://src
 .wordpress-develop.dev/wp-admin/customize.php
 As well as via a subsite: http://a.src.wordpress-develop.dev/wp-
 admin/customize.php

 This is even without the
 [https://gist.github.com/westonruter/a9c6841ba7f28192e3eb7d90c9316e75
 workaround plugin].

 Do you have any other plugins involved active?

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Ticket URL: <https://core.trac.wordpress.org/ticket/39128#comment:52>
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