Last updated September 11, 2013. Created by pwolanin on September 7, 2013.
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Manipulating the Request object:

Elements added to the attributes of the Request object by any Drupal module or service should have a _ prepended unless they come from the path. Example:

Example:

<?php
\Drupal::request()->attributes->set('_context_value', $myvalue);
?>

Only values that come from the path will have the "_" omitted, for example, the the path pattern /node/{node}

Drupal core and Symfony typically add some prefixed attributes that should not be overwritten by a contributed module. These include:

_system_path
_title
_account

(Note that _account is being removed in #2073531: Use current user service instead of _account, remove _account from the request object)

and from Symfony\Cmf\Component\Routing\RouteObjectInterface:

_route
_route_object
_controller
_content

See the the original change notice

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