GoogleAppEngine urlfetch超时异常 [英] GoogleAppEngine urlfetch timeout exception

问题描述

  DownloadError：ApplicationError：2超时
  

我正在尝试发送HTTP POST请求。像这样：

  result = urlfetch.fetch（'http://api.nathan.com:8080/Obj/' 
 method ='POST'，
 payload = postdata，
 deadline = 10）
  

我已经尝试将最后期限设置为最大（10秒）。来自命令行的请求（使用curl或httplib2）需要大约一秒钟。

  nchong @ almond〜$ time curl 
 -d< obj< a> 1< / a>< b> n< / b>< / Obj& 
 http://api.nathan.com:8080/Obj/ 
 agd1c2VyYXBpcgoLEgRTZXNzGAIM＃<钥匙由
真实返回0m1.109s 
用户0m0.003s 
 sys 0m0.009s 
  

---

这是开发应用服务器的curl请求的输出（我使用的是appengine-rest-server）：

  INFO __init__.py:819]从模块__main__ 
 INFO __init__.py:867添加模型添加模型Obj，类型为< class'__main __。Obj > 
 INFO dev_appserver.py:3243]POST / Obj HTTP / 1.1200  -  
 INFO dev_appserver_index.py:205]更新/path/to/index.yaml 
  

当我尝试使用urlfetch时，这是输出：

  ERROR __init__.py:388] ApplicationError：2超时
追溯（最近的最后一次调用）：
文件/path/to/webapp/__init__.py，第507行， __call__ 
 handler.get（* groups）
文件/path/to/myapp/main.py，第62行，get 
 result = urlfetch.fetch（...）
文件/path/to/urlfetch.py​​，行241，在fetch 
中返回rpc.get_result（）
文件/path/to/apiproxy_stub_map.py，第501行， get_result 
 return self .__ get_result_hook（self）
文件/path/to/urlfetch.py​​，第325行，_get_fetch_result 
 raise DownloadError（str（err））
 DownloadError ：ApplicationError：2超时
 INFO dev_appserver.py：3243]GET / HTTP / 1.1500  -  
 INFO dev_appserver.py：3243]POST / Obj / HTTP / 1 .1200  -  
  

解决方案

开发Web服务器是单-threaded。您不能向您自己的应用程序发出请求。尝试在不同端口上运行两个实例。

顺便说一句，部署后这不应该是一个问题，因为实际的AppEngine服务器当然可以处理多个同时请求。

Has anyone got any experience with the following exception when using GAE urlfetch?

      DownloadError: ApplicationError: 2 timed out

I'm trying to send a HTTP POST request. Like so:

      result = urlfetch.fetch('http://api.nathan.com:8080/Obj/',
                              method='POST',
                              payload=postdata,
                              deadline=10)

I've tried setting deadline to the max (10 seconds). The request from the command line (using curl or httplib2) takes about a second.

       nchong@almond ~ $ time curl
                         -d "<Obj><a>1</a><b>n</b></Obj>"
                         http://api.nathan.com:8080/Obj/
       agd1c2VyYXBpcgoLEgRTZXNzGAIM      #< key returned by call
       real 0m1.109s
       user 0m0.003s
       sys  0m0.009s

---

Here's the output from the dev appserver for the curl request (I'm using appengine-rest-server):

INFO     __init__.py:819] adding models from module __main__
INFO     __init__.py:867] added model Obj with type <class '__main__.Obj'>
INFO     dev_appserver.py:3243] "POST /Obj HTTP/1.1" 200 -
INFO     dev_appserver_index.py:205] Updating /path/to/index.yaml

Here's the output when I try to use urlfetch:

ERROR    __init__.py:388] ApplicationError: 2 timed out
Traceback (most recent call last):
  File "/path/to/webapp/__init__.py", line 507, in __call__
    handler.get(*groups)
  File "/path/to/myapp/main.py", line 62, in get
    result = urlfetch.fetch(...)
  File "/path/to/urlfetch.py", line 241, in fetch
    return rpc.get_result()
  File "/path/to/apiproxy_stub_map.py", line 501, in get_result
    return self.__get_result_hook(self)
  File "/path/to/urlfetch.py", line 325, in _get_fetch_result
    raise DownloadError(str(err))
DownloadError: ApplicationError: 2 timed out
INFO     dev_appserver.py:3243] "GET / HTTP/1.1" 500 -
INFO     dev_appserver.py:3243] "POST /Obj/ HTTP/1.1" 200 -

解决方案

The development web server is single-threaded. You can not make a request from your application running inside it to itself. Try running two instances on different ports.

By the way, this should not be a problem once it is deployed, as the actual AppEngine server is of course able to handle multiple simultaneous requests.

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