socket.gaierror: [Errno -3] 名称解析暂时失败答案

【问题标题】：socket.gaierror: [Errno -3] Temporary failure in name resolutionsocket.gaierror: [Errno -3] 名称解析暂时失败
【发布时间】：2020-08-04 07:50:52
【问题描述】：

我正在使用 python 请求库请求具有此类代码的 API：

api_request = requests.get(f"http://data.api.org/search?q=example&ontologies=BFO&roots_only=true",
                             headers={'Authorization': 'apikey token=' + 'be03c61f-2ab8'})

api_result = api_request.json()
collection = api_result["collection"]
...

当我不请求大量内容时，此代码可以正常工作，但否则我会收到错误消息。奇怪的是，每次我请求大量内容时都没有得到它。错误信息如下：

Traceback (most recent call last):
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/connection.py", line 160, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/util/connection.py", line 61, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
  File "/usr/lib/python3.6/socket.py", line 745, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 677, in urlopen
    chunked=chunked,
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 392, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/usr/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/connection.py", line 187, in connect
    conn = self._new_conn()
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/connection.py", line 172, in _new_conn
    self, "Failed to establish a new connection: %s" % e
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7f4bdeca7080>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/nobu/.local/lib/python3.6/site-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 725, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/home/nobu/.local/lib/python3.6/site-packages/urllib3/util/retry.py", line 439, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='data.api.org', port=80): Max retries exceeded with url: /ontologies/NCIT/classes/http%3A%2F%2Fncicb.nci.nih.gov%2Fxml%2Fowl%2FEVS%2FThesaurus.owl%23C48481/descendants (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f4bdeca7080>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "new_format.py", line 181, in <module>
    ontology_api(extraction(90))
  File "new_format.py", line 142, in ontology_api
    concept_extraction(collection)
  File "new_format.py", line 100, in concept_extraction
    api_request_tree = requests.get(f"{leaf}", headers={'Authorization': 'apikey token=' + f'{api_key}'})
  File "/home/nobu/.local/lib/python3.6/site-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/home/nobu/.local/lib/python3.6/site-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/nobu/.local/lib/python3.6/site-packages/requests/sessions.py", line 530, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/nobu/.local/lib/python3.6/site-packages/requests/sessions.py", line 643, in send
    r = adapter.send(request, **kwargs)
  File "/home/nobu/.local/lib/python3.6/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='data.api.org', port=80): Max retries exceeded with url: /ontologies/NCIT/classes/http%3A%2F%2Fncicb.nci.nih.gov%2Fxml%2Fowl%2FEVS%2FThesaurus.owl%23C48481/descendants (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f4bdeca7080>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))

我不知道我是否收到错误，因为如果是由于其他原因，我会过度请求 API。我无法在 SO 或其他地方找到我的问题的答案。

提前感谢您的时间和关注。

【问题讨论】：

我也有这个错误。只是很少，但仍然经常忽略它。你有进步吗？你在哪个服务器/主机上得到这个？
是的@tobltobs 我找到了解决方法。我使用请求库的 Session() 方法来增加最大重试次数，如下所示：session = requests.Session() 然后session.mount('http://', requests.adapters.HTTPAdapter(max_retries=100))

标签： python-3.x api python-requests

【解决方案1】：

with requests.Session() as s:
    s.get('http://google.com')

或

with requests.get('http://httpbin.org/get', stream=True) as r:
    # Do something

这是另一种方式

Python-Requests close http connection

但感谢session.mount('http://', requests.adapters.HTTPAdapter(max_retries=100))

【讨论】：