从XHR请求头中提取令牌R

Question

我一直在使用R和httr和plyr库从API中提取数据。它非常直截了当，并用下面的代码工作得很好：

library(httr) 
library(plyr) 

headers <- c("Accept" = "application/json, text/javascript", 
     "Accept-Encoding" = "gzip, deflate, sdch", 
     "Connection" = "keep-alive", 
     "Referer" = "http://www.afl.com.au/stat", 
     "Host" = "www.afl.com.au", 
     "User-Agent" = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36", 
     "X-Requested-With"= "XMLHttpRequest", 
     "X-media-mis-token" = "f31fcfedacc75b1f1b07d5a08887f078") 

query <- GET("http://www.afl.com.au/api/cfs/afl/season?seasonId=CD_S2016014", add_headers(headers)) 

stats <- httr::content(query) 

我的问题是与问候在头所需的请求令牌（即X-媒体误标记）。这很容易通过检查Chrome或Firefox中的XHR元素来手动获取，但令牌每24小时更新一次，使手动抽取变得非常痛苦。

是否有可能使用R自动查询网页并提取此令牌？

Answer 1

您可以获得X-media-mis-token标记，但带有免责声明。 ;）

library(httr) 
token_url <- 'http://www.afl.com.au/api/cfs/afl/WMCTok' 
token <- POST(token_url, encode="json") 
content(token)$token 
#[1] "f31fcfedacc75b1f1b07d5a08887f078" 
content(token)$disclaimer 
#[1] "All content and material contained within this site is protected by copyright owned by or licensed to Telstra. Unauthorised reproduction, publishing, transmission, distribution, copying or other use is prohibited.