python - post reguest '422 Unprocessable Entity' with fast api

Question

I have a fast api application, where I want to have a post request.

from pydantic import BaseModel
from fastapi import FastAPI


class Data(BaseModel):
    num: str

app = FastAPI()

@app.post("/set/")
def set_param(data: Data):
    return data

When I send request from another file:

import requests,json

req = requests.post('http://0.0.0.0:5000/set/',data={'num':'1'}).json()

I have an error:

INFO:     127.0.0.1:54236 - "POST /set/ HTTP/1.1" 422 Unprocessable Entity

I don;t know what should I change to eliminate this error.

Answer 1

You are not sending a valid JSON.

You should use json instead of data.

json={"num":"1"}

Use it like this

req = requests.post('http://0.0.0.0:5000/set/',json={'num':'1'}).json()

Or you can use json.dumps()

req = requests.post('http://0.0.0.0:5000/set/', json.dumps(data={'num':'1'})).json()