学习记录：企业微信API调用偶发EOF occurred in violation of protocol

问题现象

使用Python调用企业微信的API，偶发错误。

ERROR: 

HTTPSConnectionPool(host='qyapi.weixin.qq.com', port=443): 

Max retries exceeded with url: /cgi-bin/message/send?access_token=***

 (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:997)')))

研究步骤

1、参考stackoverflow文章检查Python支持的协议版本。

python -c "from urllib.request import urlopen ; print(urlopen('https://www.howsmyssl.com/a/check').read())"

2、由于我的Windows电脑完全没安装OpenSSL，报错了。

3、下载安装OpenSSL。

4、重新测试，输出结果显示支持TLS1.3。

b'{
    "given_cipher_suites": [
        "TLS_AES_256_GCM_SHA384",
        "TLS_CHACHA20_POLY1305_SHA256",
        "TLS_AES_128_GCM_SHA256",
        "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
        "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
        "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
        "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
        "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
        "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
        "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
        "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
        "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
        "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
        "TLS_DHE_RSA_WITH_AES_256_GCM_SHA384",
        "TLS_DHE_RSA_WITH_AES_128_GCM_SHA256",
        "TLS_DHE_RSA_WITH_AES_256_CBC_SHA256",
        "TLS_DHE_RSA_WITH_AES_128_CBC_SHA256",
        "TLS_EMPTY_RENEGOTIATION_INFO_SCSV"
    ],
    "ephemeral_keys_supported": true,
    "session_ticket_supported": true,
    "tls_compression_supported": false,
    "unknown_cipher_suite_supported": false,
    "beast_vuln": false,
    "able_to_detect_n_minus_one_splitting": false,
    "insecure_cipher_suites": {},
    "tls_version": "TLS 1.3",
    "rating": "Probably Okay"
}'

5、由于是偶发情况，还待后续观察企业微信API调用结果。