用 Python 下载公开课视频提示 EOF occurred in violation of protocol 是 GFW 在捣乱？

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这是一个创建于 3789 天前的主题，其中的信息可能已经有所发展或是发生改变。

改写了一个公开课edX程序（实现从CDN cloudfront下载，从而避免翻墙，地址： https://github.com/Coiby/edx-downloader ），最近无法下载课程视频了，提示：
error: SSLError(8, '_ssl.c:510: EOF occurred in violation of protocol')

如果走VPS代理，就能正常下载了（比如视频地址 https://d2f1egay8yehza.cloudfront.net/MCGBDYXX/MCGBDYXXT115-V012000_DTH.mp4）。

请问下熟悉这领域的高手，这是GFW在作恶吗？如何判断？有什么解决方法？谢谢！

附上更多测试结果：

不走代理用wget下，提示：
Resolving d2f1egay8yehza.cloudfront.net (d2f1egay8yehza.cloudfront.net)... 54.182.7.50, 54.182.2.187, 54.182.3.101, ...
Connecting to d2f1egay8yehza.cloudfront.net(d2f1egay8yehza.cloudfront.net)|54.182.7.50|:443... connected.
Unable to establish SSL connection.
用openssl（openssl s_client -connect d2f1egay8yehza.cloudfront.net:443 -tls1_2）得到的信息是：
```
CONNECTED(00000003)

140235657782944:error:1409E0E5:SSL routines:SSL3_WRITE_BYTES:ssl handshake failure:s3_pkt.c:598:

no peer certificate available

No client certificate CA names sent

SSL handshake has read 0 bytes and written 0 bytes

New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
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: 1433423574
Timeout : 7200 (sec)

Verify return code: 0 (ok)
```
 
```
如果走代理，执行上面的(openssl s_client -connect d2f1egay8yehza.cloudfront.net:443 -tls1_2)则是：
```
CONNECTED(00000003)
depth=2 C = US, O = "VeriSign, Inc.", OU = VeriSign Trust Network, OU = "(c) 2006 VeriSign, Inc. - For authorized use only", CN = VeriSign Class 3 Public Primary Certification Authority - G5
verify error:num=20:unable to get local issuer certificate

verify return:0

Certificate chain
0 s:/C=US/ST=Washington/L=Seattle/O=Amazon.com, Inc./CN=*.cloudfront.net
i:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=Terms of use at https://www.verisign.com/rpa (c)10/CN=VeriSign Class 3 Secure Server CA - G3
1 s:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=Terms of use at https://www.verisign.com/rpa (c)10/CN=VeriSign Class 3 Secure Server CA - G3
i:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc. - For authorized use only/CN=VeriSign Class 3 Public Primary Certification Authority - G5
2 s:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc. - For authorized use only/CN=VeriSign Class 3 Public Primary Certification Authority - G5

i:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority

Server certificate
-----BEGIN CERTIFICATE-----
...省略
-----END CERTIFICATE-----
subject=/C=US/ST=Washington/L=Seattle/O=Amazon.com, Inc./CN=*.cloudfront.net

issuer=/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=Terms of use at https://www.verisign.com/rpa (c)10/CN=VeriSign Class 3 Secure Server CA - G3

No client certificate CA names sent

SSL handshake has read 4727 bytes and written 421 bytes

New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
....省略
Start Time: 1433423644
Timeout : 7200 (sec)

Verify return code: 20 (unable to get local issuer certificate)
```
 
```