Trouble replicating a Python requests.post with the httr package in r
Question
This works in Python using the requests library:
plist5 = ["5021072"]
data = {"startDate": "2014-04-01", "endDate": "2014-04-01", "pnodeList": plist5}
data = json.dumps(data)
url = 'https://dataminer.pjm.com/dataminer/rest/public/api/markets/realtime/lmp/daily'
headers = {'Content-Type': 'application/json'}
response = requests.post(url, data=data, headers=headers)
I'd like to replicate the same in R using the httr package. This is what I tried without success:
url <- 'https://dataminer.pjm.com/dataminer/rest/public/api/markets/realtime/lmp/daily'
response <- POST(url, body = list(pnodeList = "5021072",
startDate = "2014-04-01",
endDate = "2014-04-01"),
headers = list('Content-Type' = 'application/json')
)
here is the response I get from the R code:
Response [https://dataminer.pjm.com/dataminerui/]
Date: 2016-02-24 15:28
Status: 200
Content-Type: text/html
Size: 159 B
<!-- Plain HTML page that kicks us into the app -->
<html>
<head>
<meta http-equiv="Refresh" content="0; URL=pages/public/index.html">
</head>
</html>
> content(response)
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<!-- Plain HTML page that kicks us into the app --><html><head><meta http-equiv="Refresh" content="0; URL=pages/public/index.html"></head></html>
Any guidance on how to proceed is much appreciated.
1 answers
solution1
0 ACCPTED 2016-02-24 16:29:16
Hopefully, someone can elaborate on why the following appears to work and/or how to dissect what was being sent in the "wrong" version versus what is being sent in this "correct" version:
response <- POST(url, body = list(pnodeList = list("5021072"),
startDate = "2014-04-01",
endDate = "2014-04-01"),
encode = "json")
)
This Quickstart Guide is what led me to trying above.
Adding verbose() allows you to see what was sent:
POST(url, body = list(pnodeList = list("5021072"),
startDate = "2014-04-01",
endDate = "2014-04-01"),
encode = "json",
verbose()
)
The most obvious flaw in your initial attempt was that in the python version, pnodeList was a list .
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