Google App Engine出现500服务器错误，不知道为什么

Question

部署在本地运行良好的Web应用程序时，我始终遇到500错误...

Error: Server Error

The server encountered an error and could not complete your request.
If the problem persists, please report your problem and mention this error message and the query that caused it.

除了我的应用程序已成功部署之外，日志没有告诉我其他任何信息。

11:50 PM Host: appengine.google.com
11:50 PM Application: suraj-kapoor; version: 1
11:50 PM 
Starting update of app: suraj-kapoor, version: 1
11:50 PM Getting current resource limits.
11:50 PM Scanning files on local disk.
11:50 PM Cloning 2 static files.
11:50 PM Cloning 6 application files.
11:50 PM Uploading 1 files and blobs.
11:50 PM Uploaded 1 files and blobs
11:50 PM Compilation starting.
11:50 PM Compilation completed.
11:50 PM Starting deployment.
11:50 PM Checking if deployment succeeded.
11:50 PM Deployment successful.
11:50 PM Checking if updated app version is serving.
11:50 PM Completed update of app: suraj-kapoor, version: 1
11:50 PM Uploading index definitions.
Password for suraj@looklab.com: If deploy fails you might need to 'rollback' manually.
The "Make Symlinks..." menu option can help with command-line work.
*** appcfg.py has finished with exit code 0 ***

这是控制台日志。请注意，PIL警告是标准警告。我确实将PIL模块导入到我的应用中，以防万一它没有任何效果...

*** Running dev_appserver with the following flags:
    --skip_sdk_update_check=yes --port=14080 --admin_port=8006
Python command: /usr/bin/python2.7
INFO     2013-06-07 14:52:57,048 devappserver2.py:522] Skipping SDK update check.
WARNING  2013-06-07 14:52:57,086 api_server.py:329] Could not initialize images API; you are likely missing the Python "PIL" module.
INFO     2013-06-07 14:52:57,109 api_server.py:153] Starting API server at: http://localhost:57543
INFO     2013-06-07 14:52:57,115 dispatcher.py:164] Starting server "default" running at: http://localhost:14080
INFO     2013-06-07 14:52:57,127 admin_server.py:117] Starting admin server at: http://localhost:8006

而且我的app.yaml看起来还不错...

application: suraj-kapoor
version: 1
runtime: python27
api_version: 1
threadsafe: yes

handlers:
- url: /static
  static_dir: static

- url: .*
  script: main.app

libraries:
- name: jinja2
  version: latest
- name: webapp2
  version: "2.5.2" 

如果需要的话，Web应用程序会使用JSON从Instagram的API中提取图像。我完全迷失了为什么我得到这个错误！

这是实时日志...

2013-06-07 08:34:21.516 /favicon.ico 500 11ms 0kb Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36
199.47.72.170 - - [07/Jun/2013:08:34:21 -0700] "GET /favicon.ico HTTP/1.1" 500 0 - "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36" "suraj-kapoor.appspot.com" ms=12 cpu_ms=0 app_engine_release=1.8.0 instance=00c61b117c22c59d63580abdad0f481f2f485295
E 2013-06-07 08:34:21.515
Traceback (most recent call last):
  File "/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 196, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 255, in _LoadHandler
    handler = __import__(path[0])
  File "/base/data/home/apps/s~suraj-kapoor/1.367922706590908179/main.py", line 7, in <module>
    import requests
ImportError: No module named requests

Answer 1

有时500强确实是由Google基础架构引起的。当他们可以检测到这种情况时，它应该将用户定向到更具体的支持页面。一般的Google支持页面对报告和应用引擎中断都没有用。