我可以在循环中进行的 HERE API 调用的数量是否有限制(使用 R)

Question

我正在尝试遍历原点列表以获得运输时间。循环时出现以下错误。但是，当我进行单个调用(不循环(时，我得到一个输出没有错误。我使用免费增值的HERE-API，每月允许我进行25万笔交易。

`for (i in 1:nrow(test))        
{ 
call <- paste0("https://route.api.here.com/routing/7.2/calculateroute.json",
"?app_id=","appid",
"&app_code=","appcode",
"&waypoint0=geo!",y$dc_lat[i],",",y$dc_long[i],
"&waypoint1=geo!",y$store_lat[i],",",y$store_long[i],
"&mode=","fastest;truck;traffic:enabled",
"&trailerscount=","1",
"&routeattributes=","sh",
"&maneuverattributes=","di,sh",
"&limitedweight=","20")
response <-fromJSON(call, simplify = TRUE)
Traffic_time = (response[["response"]][["route"]][[1]][["summary"]][["trafficTime"]]) / 60
Base_time = (response[["response"]][["route"]][[1]][["summary"]][["baseTime"]]) / 60
print(Traffic_time)
}`

Error in file(con, "r"): cannot open the connection to 'https://route.api.here.com/routing/7.2/calculateroute.json?app_id=appid&app_code=appcode&waypoint0=geo!45.1005200,-93.2452000&waypoint1=geo!45.0978500,-95.0413620&mode=fastest;truck;traffic:enabled&trailerscount=1&routeattributes=sh&maneuverattributes=di,sh&limitedweight=20' Traceback:

Answer 1

根据错误，这表明您最后的文件有问题。 它可能已损坏，最好尝试更改文件的扩展名。也可以尝试重新启动 IDE。API 调用的数量取决于您选择免费增值或专业计划的计划。您可以了解更多详情 ： https://developer.here.com/faqs