升级到appengine后断开连接错误1.7.6

Question

我使用gae和Python 2.7，升级到gae 1.7.6后，我的单元测试被破坏。我正在使用nose和nosega进行单元测试。有谁知道发生了什么事？任何想法将非常感激。我觉得这与webob 1.2.3被升级到GA有关。

self.app.post(task['url'], params, headers) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 835, in post 
    content_type=content_type) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 807, in _gen_request 
    expect_errors=expect_errors) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 1118, in do_request 
    self._check_status(status, res) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 1154, in _check_status 
    res) 
AppError: Bad response: 500 Internal Server Error (not 200 OK or 3xx redirect for http://localhost/task/request_log) 
<pre>Traceback (most recent call last): 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py&quot;, line 1089, in __call__ 
    method(*args, **kwargs) 
    File &quot;/Users/***/projects/game_server/game_service/events.py&quot;, line 184, in post 
    inputs = pickle.loads(self.request.body) 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 677, in _body__get 
    self.make_body_seekable() # we need this to have content_length 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 922, in make_body_seekable 
    self.copy_body() 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 945, in copy_body 
    self.body = self.body_file.read(self.content_length) 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 1528, in readinto 
    + &quot;(%d more bytes were expected)&quot; % self.remaining 
DisconnectionError: The client disconnected while sending the POST/PUT body (151 more bytes were expected) 
</pre> 
    self.app.post(task['url'], params, headers) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 835, in post 
    content_type=content_type) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 807, in _gen_request 
    expect_errors=expect_errors) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 1118, in do_request 
    self._check_status(status, res) 
    File "/Library/Python/2.7/site-packages/WebTest-1.4.0-py2.7.egg/webtest/app.py", line 1154, in _check_status 
    res) 
AppError: Bad response: 500 Internal Server Error (not 200 OK or 3xx redirect for http://localhost/task/request_log) 
<pre>Traceback (most recent call last): 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py&quot;, line 1089, in __call__ 
    method(*args, **kwargs) 
    File &quot;/Users/***/projects/game_server/game_service/events.py&quot;, line 184, in post 
    inputs = pickle.loads(self.request.body) 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 677, in _body__get 
    self.make_body_seekable() # we need this to have content_length 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 922, in make_body_seekable 
    self.copy_body() 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 945, in copy_body 
    self.body = self.body_file.read(self.content_length) 
    File &quot;/Users/***/Downloads/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.2.3/webob/request.py&quot;, line 1528, in readinto 
    + &quot;(%d more bytes were expected)&quot; % self.remaining 
DisconnectionError: The client disconnected while sending the POST/PUT body (151 more bytes were expected) 
</pre> 

Answer 1

简短版本：headers可能包含错误的内容长度;修复它像这样（假设params是str）：

fixed_header = ('Content-Length', str(len(params))) 
for i, header in enumerate(headers): 
    if header[0] == 'Content-Length': 
     headers[i] = fixed_header 
     fixed_header = None 
     break 
if fixed_header: # in case you're completely missing a Content-Length header 
    headers.append(fixed_header) 

---

GAE 1.7.6改变了默认的WebOb从V0.9至V1.2.3。用于检索请求参数的代码（例如，通过webob.Request.get()）在这些版本之间改变。

在1.2.3，如果你看一下BaseRequest.params它创建了一个NestedMultiDict使用BaseRequest.POST这反过来又尝试读取使用cgi.FieldStorage()它检查Content-Length头的请求的主体。如果内容长度不正确，您会看到您遇到的DisconnectionError。

在0.9,Request.params使用Request.str_params构建，其使用Request.str_POST（不同于1.2.3）构建其NestedMultiDict。这反过来使用已有的Request.body_ file，其已经与StringIO()一起使用，没有检查内容长度报头。

因此，您可以在1.7.5中使用不正确的Content-Length标头，但不在1.7.6中。

任务队列数据是Base64编码的。我怀疑你在回溯的第一行传入的params已经从其Base64格式解码，但是您没有更新headers中的Content-Length标头以反映这一点。我怀疑你从任务队列上的GetTasks()获得了任务的头部，该任务队列的Content-Length设置为原始Base64编码数据的长度。

Answer 2

您要发送的请求可能缺少适当的Content-Length标头。

没有它，服务器无法确定客户端是否已上传所有数据，或者他是否在传输过程中断开连接。