How can I get a REST client (such as the one built into PHPStorm or POSTman) to work with XDebug?
In my current set-up of XDebug, using PHPStorm and the Bookmarklet
Until http://youtrack.jetbrains.com/issue/WI-17031 will be implemented you can try one of these approaches:
Configure your xdebug (by editing php.ini) to attempt to debug every php script (xdebug.remote_autostart = 1)
Add xdebug session start parameter to the actual URL (XDEBUG_SESSION_START={{KEY}} -- http://xdebug.org/docs/remote ), for example: ?XDEBUG_SESSION_START=PHPSTORM
Pass xdebug cookie as one of the headers (the one which is set by bookmarklet or browser extension, for example)
For this to work -- make sure that "phone handle" icon is activated (Run | Start Listen for PHP Debug Connection) in advance.