如何在Google App Engine中为urlfetch设置超时？ [英] How to set timeout for urlfetch in Google App Engine?

问题描述

我试图让Django（在GAE之上）从另一个Web服务中获取数据。我经常遇到这样的错误：

ApplicationError：2超时请求

方法：GET

请求网址： http：// localhost ：8080 /

异常类型：DownloadError

异常值：ApplicationError：2超时

异常位置：_get_fetch_result中的/google_appengine/google/appengine/api/urlfetch.py​​第325行

感觉好像在12秒后才会超时（我不确定，但实际上很短）。

问题：如何设置更长的超时？

解决方案

可以使用截止日期参数提取功能。从文档：

请求处理程序的最后期限最长可达60秒，任务队列和cron作业处理程序的最后期限可达最多60分钟。如果截止日期为无，截止日期设定为5秒。

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编辑：看起来现在已经改变了。从这里：

您可以为请求设置最后期限，服务等待响应的时间最多。默认情况下，提取的截止日期为5秒。您可以使用 urlfetch.set_default_fetch_deadline（）函数调整请求的默认截止日期。

和此页面列出了默认超时值：

目前，Python运行时有几个名为DeadlineExceededError的错误： p>

• google.appengine.runtime.DeadlineExceededError ：如果整体请求超时， 60秒后，或10分钟任务队列请求。


• google.appengine.runtime.apiproxy_errors.DeadlineExceededError ：如果RPC超过了最后期限。这通常是5秒钟，但是可以使用'最后期限'选项为某些API设置。


• google.appengine.api.urlfetch_errors.DeadlineExceededError ：如果URLFetch超时，则被调高。

I'm trying to have Django (on top of GAE) fetch data from another web service. I'm often hit with error like this:

ApplicationError: 2 timed out Request

Method: GET

Request URL:http://localhost:8080/

Exception Type: DownloadError

Exception Value: ApplicationError: 2 timed out

Exception Location: /google_appengine/google/appengine/api/urlfetch.py in _get_fetch_result, line 325

It feels as if it will time out only after 12 seconds (I'm not sure, but it's really short).

Question: how can I set a longer timeout?

解决方案

You can set it using the deadline argument of the fetch function. From the docs:

The deadline can be up to a maximum of 60 seconds for request handlers and 10 minutes for tasks queue and cron job handlers. If deadline is None, the deadline is set to 5 seconds.

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Edit: looks like this has changed now. From here:

You can set a deadline for a request, the most amount of time the service will wait for a response. By default, the deadline for a fetch is 5 seconds. You can adjust the default deadline for requests using the urlfetch.set_default_fetch_deadline() function.

And this page lists the default timeout values:

Currently, there are several errors named DeadlineExceededError for the Python runtime:

• google.appengine.runtime.DeadlineExceededError: raised if the overall request times out, typically after 60 seconds, or 10 minutes for task queue requests.
• google.appengine.runtime.apiproxy_errors.DeadlineExceededError: raised if an RPC exceeded its deadline. This is typically 5 seconds, but it is settable for some APIs using the 'deadline' option.
• google.appengine.api.urlfetch_errors.DeadlineExceededError: raised if the URLFetch times out.

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