Google Apps脚本UrlFetchApp.fetch返回缓存副本 [英] Google Apps-script UrlFetchApp.fetch returning cached copy

问题描述

我在谷歌应用程序脚本中使用UrlFetchApp来执行get操作，如下所示：

  var optAdvancedArgs = {
method：GET，
headers：{Cache-Control：no-cache，Pragma：no-cache}，
}; 
 var response = UrlFetchApp.fetch（url，optAdvancedArgs）; 
  

尽管我尝试在头文件中禁用缓存，但我得到的响应始终是缓存副本。如果我使用相同的URL在我的控制台中执行wget，我会看到收到最新版本。

我的问题是：我怎样 em>在执行UrlFetchApp.fetch时禁用缓存？我的代码有什么问题吗？

解决方案

我可以通过使用max-age = 0来解决这个问题。我的缓存控制头，例如：

  var url =http://www.stackoverflow.com; 
 var options = 
 {
 //确保我们每次都得到新的站点副本。 
 headers：{'Cache-Control'：'max-age = 0'} 
}; 
 var response = UrlFetchApp.fetch（url，options）
  

听起来像Google App Engine有一个类似的问题。有人开了一个问题，但它似乎已关闭。

I am using UrlFetchApp in a google apps script to perform a get, as follows:

var optAdvancedArgs = {
    "method": "GET",
    "headers": {"Cache-Control": "no-cache", "Pragma": "no-cache"}, 
};
var response = UrlFetchApp.fetch(url, optAdvancedArgs);

Despite my attempt to disable the cache in the headers, the response I get is always a cached copy. If I perform a wget in my console using the same url, I see receive an up to date version.

My question is: How can I really disable the cache when performing a UrlFetchApp.fetch? Is there something wrong with my code?

解决方案

I was able to overcome this issue by using "max-age=0" in my Cache-Control header, e.g.:

var url = "http://www.stackoverflow.com";
var options =
  {
    // Ensure we get a fresh copy of the site every time.
    headers : {'Cache-Control' : 'max-age=0'}
  };
var response = UrlFetchApp.fetch(url, options)

It sounds like Google App Engine has a similar problem. Someone opened an issue however it appears to have been closed.

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