why is Python requests not working as intended

Question

I want to get some info from an JSON RPC API endpoint. the equivalent curl command is this:

curl 'https://api.mainnet-beta.solana.com' -X POST -H "Content-Type: application/json" -d '
  {
    "jsonrpc": "2.0", "id": 1,
    "method": "getTokenAccountBalance",
    "params": [
      "FYj69uxq52dee8AyZbRyNgkGbhJdrPT6eqMhosJwaTXB"
    ]
  }
'

it works and response is:

{"jsonrpc":"2.0","result":{"context":{"apiVersion":"1.13.5","slot":176510490},"value":{"amount":"68662508944","decimals":5,"uiAmount":686625.08944,"uiAmountString":"686625.08944"}},"id":1}

but when I want to make a call in my python script:

headers={'Content-type': 'application/json'}
            data1 =  {
              "jsonrpc": "2.0",
              "id": 1,
              "method": "getTokenAccountBalance",
              "params": [
                "FYj69uxq52dee8AyZbRyNgkGbhJdrPT6eqMhosJwaTXB",
              ]
            }
response = requests.post('https://api.mainnet-beta.solana.com',headers=headers,data=data1) 
print(response.text)

I get this:

{"jsonrpc":"2.0","error":{"code":-32700,"message":"Parse error"},"id":null}

what could be the issue?

@SembeiNorimaki because the first one is actual JSON (no trailing commas) while the second is a Python data structure. — Henry Woody, Feb 07 '23 at 11:40

score 3 · Accepted Answer · answered Feb 07 '23 at 11:38

That's because you should be using json argument of the requests.post function, not the data argument.

This is how you fix it:

import requests

headers = {'Content-type': 'application/json'}
data1 = {
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getTokenAccountBalance",
  "params": [
    "FYj69uxq52dee8AyZbRyNgkGbhJdrPT6eqMhosJwaTXB",
  ]
}

response = requests.post('https://api.mainnet-beta.solana.com', 
                         headers=headers, 
                         json=data1)
print(response.text)

Notice the json argument of the requests.post.

Thanks alot!! thought it will infer the type from header argument and didn't you can specifically choose json, I'm new to the requests library sorry — Fares_Hassen, Feb 07 '23 at 11:43

why is Python requests not working as intended

1 Answers1