Scrapy无法连接到仅支持旧版TLSv1的HTTPS站点。连接丢失

Question

使用scrapy 1.6.0（twisted 18.9.0，pyopenssl 19.0.0，openssl 1.0.2r，osx 10.14.3）。我排除了用户代理和robots.txt。似乎是证书协商问题。没有涉及Web代理。

目的地是https://www.labor.ny.gov/

重现：

04:49:59 dork@Dorks-MacBook:~
0 $ scrapy shell
.
.
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>>> fetch('https://www.labor.ny.gov')
2019-04-05 16:45:11 [scrapy.core.engine] INFO: Spider opened
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/dork/project/venv/lib/python3.6/site-packages/scrapy/shell.py", line 115, in fetch
    reactor, self._schedule, request, spider)
  File "/Users/dork/project/venv/lib/python3.6/site-packages/twisted/internet/threads.py", line 122, in blockingCallFromThread
    result.raiseException()
  File "/Users/dork/project/venv/lib/python3.6/site-packages/twisted/python/failure.py", line 467, in raiseException
    raise self.value.with_traceback(self.tb)
twisted.web._newclient.ResponseNeverReceived: [<twisted.python.failure.Failure twisted.internet.error.ConnectionLost: Connection to the other side was lost in a non-clean fashion: Connection lost.>]

尝试直接在命令行上通过OpenSSL进行连接和协商似乎也失败了：

0 $ openssl version
OpenSSL 1.0.2r  26 Feb 2019
04:49:59 dork@Dorks-MacBook:~
0 $ openssl s_client -connect www.labor.ny.gov:443
CONNECTED(00000003)
4472571500:error:140790E5:SSL routines:ssl23_write:ssl handshake failure:s23_lib.c:177:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 307 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : 0000
    Session-ID:
    Session-ID-ctx:
    Master-Key:
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1554497411
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)
---

但是，如果我强制openssl到TLSv1它似乎工作。我只是不知道如何强制从scrapy - > twisted - > pyopenssl - > OpenSSL或者如果可能的话。

04:49:59 dork@Dorks-MacBook:~
0 $ openssl s_client -tls1 -connect www.labor.ny.gov:443
CONNECTED(00000003)
depth=2 C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA
verify return:1
depth=1 C = BE, O = GlobalSign nv-sa, CN = GlobalSign Organization Validation CA - SHA256 - G2
verify return:1
depth=0 C = US, ST = New York, L = Albany, O = New York State Office for Technology, CN = labor.ny.gov
verify return:1
---
Certificate chain
 0 s:/C=US/ST=New York/L=Albany/O=New York State Office for Technology/CN=labor.ny.gov
   i:/C=BE/O=GlobalSign nv-sa/CN=GlobalSign Organization Validation CA - SHA256 - G2
 1 s:/C=BE/O=GlobalSign nv-sa/CN=GlobalSign Organization Validation CA - SHA256 - G2
   i:/C=BE/O=GlobalSign nv-sa/OU=Root CA/CN=GlobalSign Root CA
---
Server certificate
-----BEGIN CERTIFICATE-----
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邮差也无法获取页面。看起来任何依赖于OpenSSL的东西都会默默地死掉。