python - 这个 Python 请求错误是什么意思？

Question

这个 Python 请求错误是什么意思？这是否意味着它尝试连接到服务器但不能？ [Errno 8] nodename nor servname provided, or not known 是什么意思？

File "python2.7/site-packages/requests/api.py", line 55, in get

File "python2.7/site-packages/requests/api.py", line 44, in request

File "python2.7/site-packages/requests/sessions.py", line 279, in request

File "python2.7/site-packages/requests/sessions.py", line 374, in send

File "python2.7/site-packages/requests/adapters.py", line 209, in send

ConnectionError: HTTPConnectionPool(host='localhost', port=8091): Max retries exceeded with url: /pools/default (Caused by : [Errno 8] nodename nor servname provided, or not known

代码生成了这个:http://github.com...

class RestConnection(object):
    def __init__(self, serverInfo):
        #serverInfo can be a json object
        if isinstance(serverInfo, dict):
            self.ip = serverInfo["ip"]
            self.username = serverInfo["username"]
            self.password = serverInfo["password"]
            self.port = serverInfo["port"]
            self.couch_api_base = serverInfo.get("couchApiBase")
        else:
            self.ip = serverInfo.ip
            self.username = serverInfo.rest_username
            self.password = serverInfo.rest_password
            self.port = serverInfo.port
            self.couch_api_base = None

        self.base_url = "http://{0}:{1}".format(self.ip, self.port)
        server_config_uri = ''.join([self.base_url, '/pools/default'])
        self.config = requests.get(server_config_uri).json()
        # if couchApiBase is not set earlier, let's look it up
        if self.couch_api_base is None:
            #couchApiBase is not in node config before Couchbase Server 2.0
            self.couch_api_base = self.config["nodes"][0].get("couchApiBase")

仅供引用，此错误是从 Couchbase Python 客户端生成的。

Answer 1

这意味着您尝试访问的主机名的 DNS 查找失败。例如，如果我尝试查找无效的主机名，我会得到同样的错误:

>>> import requests
>>> requests.get('http://apsoapsodjaopisjdaoij.com')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests/api.py", line 65, in get
    return request('get', url, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests/safe_mode.py", line 39, in wrapped
    return function(method, url, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests/api.py", line 51, in request
    return session.request(method=method, url=url, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests/sessions.py", line 241, in request
    r.send(prefetch=prefetch)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests/models.py", line 631, in send
    raise ConnectionError(sockerr)
requests.exceptions.ConnectionError: [Errno 8] nodename nor servname provided, or not known

检查 serverInfo["ip"] 的值并确保其设置正确。