download.file不支持的URL方案中的错误 [英] Error in download.file unsupported URL scheme

问题描述

我正在使用一种算法R，该算法R调用一个Web服务，该服务对数据库进行查询并返回JSON对象.

I am working with an algorithm R that calls a webservice that makes a query to a database and returns a JSON object.

url <- "https://example.com?id=1"
json_file <- "C:/xampp/htdocs/example/Download/data.json"
download.file(url, json_file)
document <- fromJSON(json_file)

在我的机器上，当我进入服务器并运行时，该算法通常无法正常工作，出现以下错误:

On my machine the algorithm usually works bad when I go up to the server and run, I get the following error:

Error in download.file(url, json_file) : unsupported URL scheme

URL是https会有问题吗?

here is some problem for the url be https?

推荐答案

来自?download.file的详细信息"部分.

From the Details section of ?download.file.

 Note that 'https://' URLs are only supported if '--internet2' or
 environment variable 'R_WIN_INTERNET2' was set or
 'setInternet2(TRUE)' was used (to make use of Internet Explorer
 internals), and then only if the certificate is considered to be
 valid.

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