Caddy server support

[viliamkopecky]

Caddy behaves mostly as nginx. But unknown $_SERVER['SERVER_SOFTWARE'] caused default permalinks options to include index.php. This patch replicates global $is_nginx variable to Caddy's context.

[viliamkopecky]

adding and using of $is_caddy global variable

[dd32]

I wonder if it's about the time that we can assume that all web servers have rewrites available?

We could keep the iis7/apache checks as they expose methods to check.. but most other server environments DO support it today - and any future server is likely to support it too given how relied upon it is today.

[johnbillion]

Replying to dd32:

I wonder if it's about the time that we can assume that all web servers have rewrites available?

We could keep the iis7/apache checks as they expose methods to check.

This sounds sensible.

[swissspidy]

#57986 was marked as a duplicate.

[swissspidy]

What about CLI usage, Playground, or other unusual setups?

I‘d just add this patch for now & then revisit the suggested approach in a separate ticket.

Trac ticket: https://core.trac.wordpress.org/ticket/41877

[swissspidy]

In 57612:

Permalinks: Detect Caddy web server support.

Support pretty permalinks when Caddy server is detected.

Props swissspidy, mukesh27, sadpencil, cfinnberg, viliamkopecky.
Fixes #41877.

[swissspidy]

In 57613:

Coding Standards: Add missing fullstop to docblocks in wp-includes/vars.php

Follow-up to [57612.

Props mukesh27.
See #41877.

Committed in https://core.trac.wordpress.org/changeset/57612

[stevenlinx]

as a misc note