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!!

Solution 1

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'
    }

---

Solution 2

as a work around:

pip install urllib3==1.25.11

Solution 3

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

You can use pip install urllib3==1.25.8

Solution 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/

Solution 5

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

View more solutions

Comments

[DeepSpace]

Provide a minimal reproducible example

[S.V]

I get the error just from running pip3 install --upgrade pip

[dhgoratela]

@scrubjay55 This actually worked! I spent one day and had almost given up on the SSL error. Tried a lot of solutions but nothing worked.. Relieved finally :) Thank you! How did you find out the fix?

[Steven Lee]

mee too. What's the value of PROXY_PORT?

[mikhail]

Depends on your proxy server. It should be your proxy address (not necessarily 127.0.0.1 as in my case) and the port.

[shcrela]

In my case, changing the value of the https_proxy variable from https to http solved the issue by itself.

[wings]

Same error when executing "pip install urllib3==1.25.11" ...

[Theo F]

this worked for me. But I'm keen to properly fix this issue soon.

[mihca]

I had to turn of the proxy (in Windows settings) to be able to install urllib3==1.25.11 as suggested in other answers. Otherwise the installation of old urllib3 using pip failed with the same error message. After the installation of old urllib3, the issue is gone even with active proxy settings.

[mihca]

I had to disable the proxy in Windows settings to be able to downgrade urllib3. Afterwards the issue is gone even with active proxy settings.

[diaryfolio]

can confirm this worked with python 2.7 and very useful to put in requirements.txt to ensure the version is precise

[Ian]

Similar situation, I turned down my "System Proxy" and the problem solved.

[ah-shiang han]

Thanks, this works in windows too, set HTTPS_PROXY=127.0.0.1:3128, then it worked

[Kevin Seymour]

Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.

[Eric Aya]

This has already been mentioned in other answers. When answering older questions that already have answers, please make sure you provide either a novel solution or a significantly better explanation than existing answers.

[Corey]

Work for me! But can you explain why?

[JaY KuMaR]

worked for me thanks a lot man ;)

[Vincent]

This is the right answer!!!

[Sithum Batrow]

Yes but I did not vote

[nlhnt]

This is might be important to some: github.com/conda/conda/issues/10590

[Diego Suarez]

This solved my problem with python 3.9.6 requests module using proxies, thanks KEVIN