UrlFetchApp 无法访问本地主机资源

这很好用:

var resp = UrlFetchApp.fetch("someremotehost/SomeFile.csv");
resp.getResponseCode();  //returns 200
resp.getContentText();   //returns the data

但是，在我的本地机器上，我正在运行 xampp，其中 SomeFile.csv 位于 htdocs/dev 但我无法让它在本地主机上工作:

however, on my local machine, I'm running xampp with SomeFile.csv is located in htdocs/dev but I cannot get it to work on localhost:

var resp = UrlFetchApp.fetch("localhost/dev/SomeFile.csv");
resp.getResponseCode(); //returns 0.0
resp.getContentText()   //returns nothing!

我检查了 chrome-extension 邮递员和 http://localhost/dev/SomeFile.csv 工作正常，那么为什么 UrlFetchApp.fetch("http://localhost/dev/SomeFile.csv") 不起作用?

I checked with chrome-extension postman and http://localhost/dev/SomeFile.csv works fine, so why does UrlFetchApp.fetch("http://localhost/dev/SomeFile.csv") not work?