调试斜纹异常错误

Question

我一直没有去URL斜嘴，我找不到进一步调试问题的方法。我已经在twill中为“http”，“equiv-refresh”和“命令”启用了调试级别，仍然斜纹没有提供有关错误的任何细节。这是twill-sh的输出：

    $ twill-sh

     -= Welcome to twill! =-

    current page:  *empty page*
    >> debug equiv-refresh 1
    DEBUG: setting equiv-refresh debugging to level 1
    current page:  *empty page*
    >> debug http 1
    DEBUG: setting http debugging to level 1
    current page:  *empty page*
    >> debug commands 1
    DEBUG: setting commands debugging to level 1
    current page:  *empty page*
    >> go https://auth.nbnco.net.au/okta/login

    ERROR: cannot go to 'https://auth.nbnco.net.au/okta/login'

    current page:  *empty page*

这是python脚本的输出：

    $ ./test.py
    Traceback (most recent call last):
      File "./test.py", line 13, in <module>
        go("https://auth.nbnco.net.au/okta/login")
      File "/usr/lib/python2.7/site-packages/twill/commands.py", line 109, in go
        browser.go(url)
      File "/usr/lib/python2.7/site-packages/twill/browser.py", line 91, in go
        raise TwillException("cannot go to '%s'" % (url,))
    twill.errors.TwillException: cannot go to 'https://auth.nbnco.net.au/okta/login'

Answer 1

猜猜：Twill不会加载页面，因为验证页面的SSL证书时出现问题。

尝试使用urllib2.urlopen获取页面失败，并显示以下错误：

>>> urllib2.urlopen('https://auth.nbnco.net.au/okta/login')
Traceback (most recent call last):
...                                                                                                       
urllib2.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)>   

使用curl获取页面会产生以下输出：

$  curl https://auth.nbnco.net.au/okta/login > /dev/null
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

在Firefox和Chromium中，页面加载时没有错误，因此浏览器的证书处理会对证书进行不同的处理。

站点SSL证书由Symantec颁发。这种行为可能与过去的Symantec证书颁发问题有关，这导致Chrome和Mozilla宣布他们将distrust SSL certificates from Symantec in 2018。

我认为在Twill中你无法解决这个问题。