google-app-engine - Google App Engine 上的 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，我一直收到 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，日志没有告诉我任何其他信息...

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 ***

这里是控制台日志。请注意，PIL 警告作为标准警告出现。我确实将 PIL 模块导入到我的应用程序中以防万一，但它没有任何效果......

*** 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

我的 app.yaml 看起来不错...

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" 

Web 应用程序使用 JSON 从 Instagram 的 API 中提取图像(如果需要的话)。我完全不知道为什么会收到此错误!

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 真的是由 Google 基础设施造成的。他们什么时候能检测到在这种情况下，它应该将用户引导至更具体的支持页面。一般Google 支持页面对于报告和应用引擎中断毫无用处。