Why requests raise this exception "check_hostname requires server_hostname"?

Question

p={
    'http':'http://my correct proxy here',
    'https':'https://my correct proxy here'
    }
self.response=requests.get(url=url,headers=self.headers,timeout=(6,15),proxies=p)

And then it raise the exception:

Traceback (most recent call last):
  File "C:\Users\xyl13509876955\Desktop\Monitor\dicks.py", line 61, in send_request
    self.response=requests.get(url=url,headers=self.headers,timeout=(6,15),proxies=p)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\adapters.py", line 449, in send
    timeout=timeout
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connectionpool.py", line 696, in urlopen
    self._prepare_proxy(conn)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connectionpool.py", line 964, in _prepare_proxy
    conn.connect()
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connection.py", line 359, in connect
    conn = self._connect_tls_proxy(hostname, conn)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connection.py", line 506, in _connect_tls_proxy
    ssl_context=ssl_context,
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\util\ssl_.py", line 432, in ssl_wrap_socket
    ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\ssl.py", line 423, in wrap_socket
    session=session
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\ssl.py", line 827, in _create
    raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname

Please help me solve the problem and the best way is to show me the right code. I am very confused and frustrated for the problem!!

Answer 1

as a work around:

pip install urllib3==1.25.11

Answer 2

As I understand, in new urllib3 the main schema of proxy was changed... can read here . This settings help for me (for urllib3=1.26.4).

An old

proxy={
    'http':'8.88.888.8:8888',
    'https':'8.88.888.8:8888'
    }

The new

proxy={
    'https': 'https://8.88.888.8:8888',
    'http': 'http://8.88.888.8:8888',
    } 

---

UPDATED

I have met this issue again for requests 2.26.0 , but in this time it works with an old schema...

proxy={
    'http':'8.88.888.8:8888',
    'https':'8.88.888.8:8888'
    }

---

Answer 3

I have solved the problem. It is a bug with urllib3.

You can use pip install urllib3==1.25.8

Answer 4

Downgrading urllib3 has solved it for me too. Though I had to reset the proxy env var: https_proxy="http://127.0.0.1:<PROXY_PORT>" pip install urllib3==1.25.11

Without that, I was getting the following error and it couldn't downgrade urllib3 (see SSLError installing with pip ).

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1091)'))': /simple/pip/

Answer 5

In my case, Charles ' windows proxy function caused this error. After I close windows proxy , this error is gone.

Answer 6

Had the same problem on Ubuntu 18.04 using Python 3.6.9, searched through a lot of pages and finally fixed it via trial and error.

The fix is changing the environment variable https_proxy . Previously https_proxy is https://127.0.0.1:<PORT> and I removed the https header via:

export https_proxy=127.0.0.1:<PORT>

Then I can do python3 -m pip install --upgrade urllib3 .

Answer 7

None of the answers did it for me. Here's a silly looking solution that fixed my problem:

If you, like me trying to install packages in a corporate environment, you probably have given a proxy to limit interactions with world wide web, so all you have to do is to export that proxy in http and https format.

something like this:

export http_proxy=http://x.x.x.x:8080

export https_proxy=http://x.x.x.x:8080

(my proxy didnt use the ssl, it didnt even matter.)

replace x with your proxy ip

Answer 8

On Linux, the problem can be resolved by replacing https with http in the proxy settings environment variable export https_proxy=http://123.123.123.123:8888 . Note, it is proxy settings for https , but an http address is used.

Answer 9

I ran into the same issue, the proxy config is enabled by accident. Just turning off the proxy worked for me.

Answer 10

Turn Your VPN/Proxy thing (which enables as System Proxy) maybe it fixed.

i was using QV2ray and i had this issue, when i disabled it, pip works fine.

Answer 11

Don't use VPN proxy service off it and try again

Answer 12

p={
    'http':'http://my correct proxy here',
    'https':'https://my correct proxy here'
    }
self.response=requests.get(url=url,headers=self.headers,timeout=(6,15),proxies=p)

And then it raise the exception:

Traceback (most recent call last):
  File "C:\Users\xyl13509876955\Desktop\Monitor\dicks.py", line 61, in send_request
    self.response=requests.get(url=url,headers=self.headers,timeout=(6,15),proxies=p)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\adapters.py", line 449, in send
    timeout=timeout
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connectionpool.py", line 696, in urlopen
    self._prepare_proxy(conn)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connectionpool.py", line 964, in _prepare_proxy
    conn.connect()
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connection.py", line 359, in connect
    conn = self._connect_tls_proxy(hostname, conn)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\connection.py", line 506, in _connect_tls_proxy
    ssl_context=ssl_context,
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\util\ssl_.py", line 432, in ssl_wrap_socket
    ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\site-packages\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock)
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\ssl.py", line 423, in wrap_socket
    session=session
  File "C:\Users\xyl13509876955\AppData\Local\Programs\Python\Python37\lib\ssl.py", line 827, in _create
    raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname

Please help me solve the problem and the best way is to show me the right code. I am very confused and frustrated for the problem!!

Answer 13

I got this error when I was using a proxy. I disabled the proxy, the error was fixed.

Answer 14

As others mention, it has something to do with the connection to the server.

I solved it simply by closing Fiddler.

Answer 15

For those of you that can't disable their proxy, I found that downgrading pip was the only thing that worked. The version that works for me is located here: https://pypi.org/project/pip/20.2.4/

Download the whl and use

pip install pip-20.2.4-py2.py3-none-any.whl

at the location you downloaded it to.

Answer 16

I had the same problem using Python 3.10.7 (64-bit) on Windows 10.

Rolling back urllib3 to 1.25.11 didn't help.

Using python 3.19.13 (64-bit) instead resolved this error message no matter which urllib3 is used.

I assume that this is caused by some compatibility issue with Python 3.10.x.

Answer 17

if you open the off poxy tools, you sh close it