What is the best way to scrape NOAA for daily summaries for a specific station for previous weather reports?

Question

This is the code I am using to try to scrape the data from 2001 to 2020, but i keep getting a 'JSONDecodeError: Expecting value: line 1 column 1 (char 0)'

    import requests
import pandas as pd
import json
from datetime import datetime
token = 'token'
sta = ['USW00013897', 'USW00013891', 'USW00013893' ]
for year_ in year:
    url = 'https://www.ncdc.noaa.gov/cdo-web/api/v2/data?dataset=daily-summaries&dataTypes=PRCP,SNOW,TMAX,TMIN&stations={}&startDate=2001-01-01&endDate=2020-12-31&format=csv'.format(sta)
    headers = {"token":token}
    r = requests.get(url, "dataset", headers = headers).text
    response = json.loads(r)
    weather = parsed["dataype"][x]
    data.append([x,weather])
print(response)