def METHOD_NAME(datastore: ChangeDetectionStore):
    check_proxies_blueprint = Blueprint('check_proxies', __name__)
    checks_in_progress = {}
    @threadpool
    def long_task(uuid, preferred_proxy):
        import time
        from changedetectionio import content_fetcher
        status = {'status': '', 'length': 0, 'text': ''}
        from jinja2 import Environment, BaseLoader
        contents = ''
        now = time.time()
        try:
            update_handler = text_json_diff.perform_site_check(datastore=datastore)
            changed_detected, update_obj, contents = update_handler.run(uuid, preferred_proxy=preferred_proxy, skip_when_checksum_same=False)
        # title, size is len contents not len xfer
        except content_fetcher.Non200ErrorCodeReceived as e:
            if e.status_code == 404:
                status.update({'status': 'OK', 'length': len(contents), 'text': f"OK but 404 (page not found)"})
            elif e.status_code == 403 or e.status_code == 401:
                status.update({'status': 'ERROR', 'length': len(contents), 'text': f"{e.status_code} - Access denied"})
            else:
                status.update({'status': 'ERROR', 'length': len(contents), 'text': f"Status code: {e.status_code}"})
        except text_json_diff.FilterNotFoundInResponse:
            status.update({'status': 'OK', 'length': len(contents), 'text': f"OK but CSS/xPath filter not found (page changed layout?)"})
        except content_fetcher.EmptyReply as e:
            if e.status_code == 403 or e.status_code == 401:
                status.update({'status': 'ERROR OTHER', 'length': len(contents), 'text': f"Got empty reply with code {e.status_code} - Access denied"})
            else:
                status.update({'status': 'ERROR OTHER', 'length': len(contents) if contents else 0, 'text': f"Empty reply with code {e.status_code}, needs chrome?"})
        except Exception as e:
            status.update({'status': 'ERROR OTHER', 'length': len(contents) if contents else 0, 'text': 'Error: '+str(e)})
        else:
            status.update({'status': 'OK', 'length': len(contents), 'text': ''})
        if status.get('text'):
            status['text'] = Environment(loader=BaseLoader()).from_string('{{text|e}}').render({'text': status['text']})
        status['time'] = "{:.2f}s".format(time.time() - now)
        return status
    def _recalc_check_status(uuid):
        results = {}
        for k, v in checks_in_progress.get(uuid, {}).items():
            try:
                r_1 = v.result(timeout=0.05)
            except Exception as e:
                # If timeout error?
                results[k] = {'status': 'RUNNING'}
            else:
                results[k] = r_1
        return results
    @login_required
    @check_proxies_blueprint.route("/<string:uuid>/status", methods=['GET'])
    def get_recheck_status(uuid):
        results = _recalc_check_status(uuid=uuid)
        return results
    @login_required
    @check_proxies_blueprint.route("/<string:uuid>/start", methods=['GET'])
    def start_check(uuid):
        if not datastore.proxy_list:
            return
        if checks_in_progress.get(uuid):
            state = _recalc_check_status(uuid=uuid)
            for proxy_key, v in state.items():
                if v.get('status') == 'RUNNING':
                    return state
        else:
            checks_in_progress[uuid] = {}
        for k, v in datastore.proxy_list.items():
            if not checks_in_progress[uuid].get(k):
                checks_in_progress[uuid][k] = long_task(uuid=uuid, preferred_proxy=k)
        results = _recalc_check_status(uuid=uuid)
        return results
    return check_proxies_blueprint