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mod_roster_command: Fix subscription when the "user JID" is a bare domain. Do not attempt to update the roster when the user is bare domain (e.g. a component), since they don't have rosters and the attempt results in an error: $ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value) stack traceback: /usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster' /usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out' mod_roster_command.lua:44: in function 'subscribe'

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labels:
summary: HTTP Strict Transport Security
...

Introduction
============

This module implements [HTTP Strict Transport
Security](https://tools.ietf.org/html/rfc6797) and responds to all
non-HTTPS requests with a `301 Moved Permanently` redirect to the HTTPS
equivalent of the path.

Configuration
=============

Add the module to the `modules_enabled` list and optionally configure
the specific header sent.

    modules_enabled = {
      ...
          "strict_https";
    }
    hsts_header = "max-age=31556952"

Compatibility
=============

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  trunk   Works
  0.9     Works
  0.8     Doesn't work
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