supporting protocol-relative urls

[nagyv]

changing http:// and https:// generated links to // links would easily add support for hosting a site both under http and https easily

one place I've found this to be changed is in wp-includes/link-template.php around line 2006

the first if could be changed to:

$url = str_replace( "https://", "//", $url)
$url = str_replace( "http://", "//", $url)

[nagyv]

a git diff

[georgestephanis]

I don't think you're tracing the code far back enough ... WP_CONTENT_URL is defined partially off of get_option( 'siteurl' ); -- which currently requires there to be a http:// or https://

Your best option with this may be to enable defining that as //example.com rather than http://example.com or https://example.com

[lkraav]

@georgestephanis, there is no ticket for home and siteurl protocol relative options, correct? If not, I think that's the core issue and this ticket should be retargeted to solving it.

3.9 still doesn't let me set addresses as //domain.com

[SergeyBiryukov]

#29768 was marked as a duplicate.

[SergeyBiryukov]

The issue is that sanitize_option()​ specifically requires http(s?)://.

[SergeyBiryukov]

Looks like changing the regex in sanitize_option() is not enough:

1. If you set home and siteurl to a relative URL, you can no longer log in.
2. Links are still generated with http://.

[SergeyBiryukov]

#35814 was marked as a duplicate.

[ericlewis]

A WordPress site should either be configured to serve HTTP or HTTPS, ​the protocol relative URL is an anti-pattern.

We should review ​our HTTPS setup documentation and see if it can be improved.

[jorbin]

#37108 was marked as a duplicate.

[SergeyBiryukov]

#39846 was marked as a duplicate.