Pyramid bootstrap setting a base_url for the request.

gistfile1.py

def bootstrap(config_uri, options=None):
    """
    Bootstraps a pyramid environment

    Differences with the default pyramid bootstrap:
    - It handles tasks.base_url
    """
    app = get_app(config_uri, options=options)
    registry = global_registries.last
    base_url = registry.settings.get('tasks.base_url', None)
    factory = registry.queryUtility(IRequestFactory, default=Request)
    request = factory.blank('/', base_url=base_url)
    env = prepare(request)
    env['app'] = app
    return env