webapp2/App Engine 中的调试模式不输出错误或堆栈跟踪

发布于 2024-12-26 19:28:48 字数 917 浏览 2 评论 0原文

我正在使用最新版本的 Google App Engine、Python 2.7 和 webapp2，但启用调试模式只会在出现错误时显示空白 HTML 页面，而不是显示错误和堆栈跟踪。这看起来不像预期的行为：

“在调试模式下，现在捕获的任何异常都会引发，并向客户端显示堆栈跟踪” http://webapp-improved.appspot.com/guide/app.html

我做错了什么吗？如果没有，如何使用 webapp2 中的自定义错误处理程序打印堆栈跟踪？

谢谢。

编辑：这是一个重现错误的示例应用程序：

app.yaml

application: testapp
version: 1
runtime: python27
api_version: 1
threadsafe: true

handlers:
- url: /.*
  script: main.app

libraries:
- name: jinja2
  version: "2.6"

main.py

import webapp2

# Run application
app = webapp2.WSGIApplication([webapp2.Route('/', handler='handlers.IndexHandler')], debug=True)

由于没有名为“handlers.py”的文件包含 IndexHandler，因此该应用程序会引发 500 服务器错误。但即使 debug = True，应用程序也仅显示一个空页面，并且不会输出错误和堆栈跟踪（App Engine 日志除外）。

我还没有在生产服务器上尝试过这个。

原文

I'm using the latest version of Google App Engine, Python 2.7 and webapp2, but enabling debug mode just gives me a blank HTML page on error rather than displaying the error and stack trace. This does not seem like the expected behavior:

"When in debug mode, any exception that is now caught is raised and the stack trace is displayed to the client"
http://webapp-improved.appspot.com/guide/app.html

Am I doing something wrong? If not, how can I print the stack trace using a custom error handler in webapp2?

Thanks.

EDIT: Here's an example app that reproduces the error:

app.yaml

application: testapp
version: 1
runtime: python27
api_version: 1
threadsafe: true

handlers:
- url: /.*
  script: main.app

libraries:
- name: jinja2
  version: "2.6"

main.py

import webapp2

# Run application
app = webapp2.WSGIApplication([webapp2.Route('/', handler='handlers.IndexHandler')], debug=True)

Because there is no file called "handlers.py" containing IndexHandler, this app throws a 500 server error. But even though debug = True, the app just shows an empty page, and does not output the error and stack trace, except in the App Engine log.

I have not tried this on the production server.

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