BadStatusline在Python 3中返回服务器回复时会提出异常



我正在尝试将脚本移植到python 3,以提交XML feeds:

运行2to3.py并进行了一些次要调整以删除任何语法错误,因此脚本失败了:

(py33dev) d:devworkspace>python pushfeed_client.py --datasource="TEST1" --feedtype="full" --url="http://gsa:19900/xmlfeed" --xmlfilename="test.xml"
Traceback (most recent call last):
  File "pushfeed_client.py", line 108, in <module>
    main(sys.argv)
  File "pushfeed_client.py", line 56, in main
    result = urllib.request.urlopen(request_url)
  File "C:Python33Liburllibrequest.py", line 156, in urlopen
    return opener.open(url, data, timeout)
  File "C:Python33Liburllibrequest.py", line 469, in open
    response = self._open(req, data)
  File "C:Python33Liburllibrequest.py", line 487, in _open
    '_open', req)
  File "C:Python33Liburllibrequest.py", line 447, in _call_chain
    result = func(*args)
  File "C:Python33Liburllibrequest.py", line 1268, in http_open
    return self.do_open(http.client.HTTPConnection, req)
  File "C:Python33Liburllibrequest.py", line 1253, in do_open
    r = h.getresponse()
  File "C:Python33Libhttpclient.py", line 1147, in getresponse
    response.begin()
  File "C:Python33Libhttpclient.py", line 358, in begin
    version, status, reason = self._read_status()
  File "C:Python33Libhttpclient.py", line 340, in _read_status
    raise BadStatusLine(line)
http.client.BadStatusLine: <!DOCTYPE html>

为什么通过服务器的响应来返回该异常?这是我嗅到会话时GSA的全部回应:

<!DOCTYPE html>
<html lang=en>
  <meta charset=utf-8>
  <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">
  <title>Error 400 (Bad Request)!!1</title>
  <style>
    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}
  </style>
  <a href=//www.google.com/><img src=//www.google.com/images/errors/logo_sm.gif alt=Google></a>
  <p><b>400.</b> <ins>That’s an error.</ins>
  <p>Your client has issued a malformed or illegal request.  <ins>That’s all we know.</ins>

它确实返回了HTTP400。只要XML有效负载中有UTF-8字符,我就可以可靠地导致此问题。当它是普通的ASCII时,它可以完美地工作。这是我可以用来可靠重新创建问题的代码的最基本版本:

import http.client
http.client.HTTPConnection.debuglevel = 1
with open("GSA_full_Feed.xml", encoding='utf-8') as xdata:
    payload = xdata.read()
content_length = len(payload)
feed_path = "xmlfeed"
content_type = "multipart/form-data; boundary=----------boundary_of_feed_data$"
headers = {"Content-type": content_type, "Content-length": content_length}
conn = http.client.HTTPConnection("gsa", 19900)
conn.request("POST", feed_path, body=payload.encode("utf-8"), headers=headers)
res = conn.getresponse()
print(res.read())
conn.close()

这是用于导致例外的示例XML有效载荷:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE gsafeed PUBLIC "-//Google//DTD GSA Feeds//EN" "gsafeed.dtd">
<gsafeed>
  <header>
    <datasource>TEST1</datasource>
    <feedtype>full</feedtype>
  </header>
  <group>
    <record action="add" mimetype="text/html" url="https://myschweetassurl.com">
      <metadata>
        <meta content="shit happens, then you die" name="description"/>
      </metadata>
      <content>wacky Umläut test of non utf-8 characters</content>
    </record>
  </group>
</gsafeed>

我可以在2和3版本之间找到唯一的三角洲,是每个请求的内容长度的标题。Python 3版本始终短于2版,870 vs.873。

经过大量的WirSharking,我发现问题的原因和解决方案是设置内容长度的标题的方式。在脚本的Python 3端口中,我复制了设置内容长度的方法。这是:

headers['Content-length']=str(len(body))

那是不正确的!正确的方法是:

headers['Content-length']=str(len(bytes(body, 'utf-8')))

因为有效载荷必须是字节对象。当您的字体编码时,长度与字符串版本不同。

return urllib.request.Request(theurl, bytes(body, 'utf-8'), headers)

使用从http.client.httpconnection派生的任何内容时,您可以安全省略手动设置内容长度的标头。它具有一个内部方法,可以检查内容长度的标头,如果缺少内容,则根据内容主体的长度进行设置。

这个问题是翻译,但Python 2和3之间的微妙差异以及它如何处理字符串和编码它们。当UTF-8版本没有的情况下,常规ASCII版本一定是某种fluke,哦。

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