How can I make request for an API?

Question

I'm trying to make request for API: https://thegraph.com/hosted-service/subgraph/uniswap/uniswap-v2 but I haven't ideas for this. My code gives me next ouput: Response <400> How can I fix it?

My code:

import requests
import json

headers = {'content-type': 'application/json'}

def uniswap():
    url = "https://api.thegraph.com/subgraphs/name/uniswap/uniswap-v2"
    data = {
        'pairs': [
            "id",
            "reserve" : {
                "name",
                "symbol"
            }
        ]
    }
    r = requests.post(url, data=data, headers=headers)
    print(r)

def main():
    uniswap()

if __name__ == "__main__":
    main()

Link for site:

https://thegraph.com/hosted-service/subgraph/uniswap/uniswap-v2