<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def spider_url(zap_helper, url, context_name, user_name):
 """Run the spider against a URL."""

    console.info('Running spider...')
    with helpers.zap_error_handler():
        zap_helper.run_spider(url, context_name, user_name)