utils.py 文件源码

def _should_use_proxy(url, no_proxy=None):
    """Determines whether a proxy should be used to open a connection to the 
    specified URL, based on the value of the no_proxy environment variable.
    @param url: URL
    @type url: basestring or urllib2.Request
    """
    if no_proxy is None:
        no_proxy_effective = os.environ.get('no_proxy', '')
    else:
        no_proxy_effective = no_proxy

    urlObj = urlparse_.urlparse(_url_as_string(url))
    for np in [h.strip() for h in no_proxy_effective.split(',')]:
        if urlObj.hostname == np:
            return False

    return True