httr'客戶端錯誤：（407）代理驗證必需'

Question

我已經在防火牆後面，因此使用代理服務器。

library(httr) 

set_config(
    use_proxy(url="18.91.12.23", port=8080) 
) 
r <- GET('http://httpbin.org/get',verbose()) 
http_status(r) 

這裏就是顯示錯誤：

r <- GET('http://httpbin.org/get',verbose()) 
-> GET http://httpbin.org/get HTTP/1.1 
-> Host: httpbin.org 
-> User-Agent: libcurl/7.47.1 r-curl/0.9.7 httr/1.2.1 
-> Accept-Encoding: gzip, deflate 
-> Proxy-Connection: Keep-Alive 
-> Cookie: BCSI-CS-342e9f19b1226740=2 
-> Accept: application/json, text/xml, application/xml, */* 
-> 
<- HTTP/1.1 407 Proxy Authentication Required 
<- Proxy-Authenticate: NTLM 
<- Proxy-Authenticate: BASIC realm="onmi" 
<- Cache-Control: no-cache 
<- Pragma: no-cache 
<- Content-Type: text/html; charset=utf-8 
<- Proxy-Connection: close 
<- Set-Cookie: BCSI-CS-342e9f19b1226740=2; Path=/ 
<- Connection: close 
<- Content-Length: 3645 
<- 
> http_status(r) 
$category 
[1] "Client error" 

$reason 
[1] "Proxy Authentication Required" 

$message 
[1] "Client error: (407) Proxy Authentication Required" 

我試着在我的Internet Explorer中設置代理，Sys.setenv（），with_config（use_proxy（））。但是，這些都沒有工作，我得到相同的客戶端錯誤407.

我已經嘗試GET，POST與不同的URL，但它又是一樣的錯誤。請幫忙！

Answer 1

代理正在詢問認證憑證，響應代碼指示代理將接受基本憑證（用戶名/密碼）以及NTLM憑證。這兩者之間最簡單的區別是，如果流量被嗅探，密碼將在基本憑證模式下可見。另外NTLM是握手過程，而基本憑證是單一請求通信。

使用基本憑據的例子：

use_proxy(url = "18.91.12.23", port = 8080, username = "username-you-wish-to-use", password = "password-you-wish-to-use", auth = "basic") 

使用NTLM憑據的例子：

use_proxy(url = "18.91.12.23", port = 8080, username = "username-you-wish-to-use", password = "password-you-wish-to-use", auth = "ntlm")