升級到appengine後斷開連接錯誤1.7.6

Question

我使用gae和Python 2.7，升級到gae 1.7.6後，我的單元測試被破壞。我正在使用nose和nosega進行單元測試。有誰知道發生了什麼事？任何想法將非常感激。我覺得這與webob 1.2.3被升級到GA有關。

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

簡短版本：headers可能包含錯誤的內容長度;修復它像這樣（假設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改變了默認的WebOb從V0.9至V1.2.3。用於檢索請求參數的代碼（例如，通過webob.Request.get()）在這些版本之間改變。

在1.2.3，如果你看一下BaseRequest.params它創建了一個NestedMultiDict使用BaseRequest.POST這反過來又嘗試讀取使用cgi.FieldStorage()它檢查Content-Length頭的請求的主體。如果內容長度不正確，您會看到您遇到的DisconnectionError。

在0.9,Request.params使用Request.str_params構建，其使用Request.str_POST（不同於1.2.3）構建其NestedMultiDict。這反過來使用已有的Request.body_ file，其已經與StringIO()一起使用，沒有檢查內容長度報頭。

因此，您可以在1.7.5中使用不正確的Content-Length標頭，但不在1.7.6中。

任務隊列數據是Base64編碼的。我懷疑你在回溯的第一行傳入的params已經從其Base64格式解碼，但是您沒有更新headers中的Content-Length標頭以反映這一點。我懷疑你從任務隊列上的GetTasks()獲得了任務的頭部，該任務隊列的Content-Length設置爲原始Base64編碼數據的長度。

Answer 2

您要發送的請求可能缺少適當的Content-Length標頭。

沒有它，服務器無法確定客戶端是否已上傳所有數據，或者他是否在傳輸過程中斷開連接。