“如何修复”；JSON输入意外结束“；在python CGI脚本和javascript之间

我一直收到“SyntaxError:JSON输入的意外结束” 但我想不出原因

我使用此javascript代码向python脚本发送2个数字，并从python接收json应答

const requestData = (num1, num2) => {
    
    let number1 = JSON.stringify(num1);
    let number2 = JSON.stringify(num2);

    //here I send the data to the cgi python script. But instead of a json answer I get this error
    const data = fetch(`./cgi-bin/test.cgi?num1=${number1}&num2=${number2}`)
    .then(response => {return response.json() //the error occurs here: "SyntaxError: Unexpected end of JSON input"
    })
    .catch(err => console.error(err))
}

requestData(2, 3);

这是我的python脚本，应该是 从javascript代码接收两个数字，并将答案转换为json并发送回

#!/usr/bin/env python3
import json
import cgi

def sum(num1, num2):
    solution = num1 + num2
    return {"solution": solution}

# here I read the data I have received from javascript
parameters = cgi.FieldStorage();
num1 = json.loads(parameters.getValue('num1'));
num2 = json.loads(parameters.getValue('num2'));
answer = sum(num1, num2)

# here I send an answer back to javascript
print("Content-Type: application/json")
print()
# I suspect that the issue might be with this code. Maybe it doesn't properly convert to json?? but I'm not sure
print(json.dumps(answer))

我不明白错误的原因。

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谢谢大家帮助我

使用DevTools中的“网络”选项卡查看完整响应。