Python 3.x Python requests.post响应主体表示b'；错误的容量值和错误的标题

我正在尝试分析我的回复后正文： 当我执行curl时，我的服务将返回以下响应：

curl  -v -POST -H 'Content-type: application/json' http://localhost:6543/myservice -d '{"problem": {"capacity": 60, "weights": [10, 20, 33], "values": [10, 3, 30]}'

* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 6543 (#0)
> POST /myservice HTTP/1.1
> Host: localhost:6543
> User-Agent: curl/7.60.0
> Accept: */*
> Content-type: application/json
> Content-Length: 76
> 
* upload completely sent off: 76 out of 76 bytes
< HTTP/1.1 200 OK
< Content-Length: 279
< Content-Type: application/json
< 
{
"problem" : {
    "capacity" : 60,
    "values" : [
        10,
        3,
        30
    ],
    "weights" : [
        10,
        20,
        33
    ]
},
"solution" : "{}",
"status" : "submitted",
"task" : "1001",
"timestamps" : {
    "completed" : "null",
    "started" : "null",
    "submitted" : "1552052954"
}
* Connection #0 to host localhost left intact
}

两个人之间有什么问题？为什么我的python响应没有打印主体？ 同样令人惊讶的是，标题的输出也是错误的：

---

{'Connection'：'close'，'Content Length'：'20'}

您可以发送字典本身（换句话说，API允许您以这样一种方式编写代码，看起来您正在发送非常

的dict

对象）：

---

您可以发送字典本身（换句话说，API允许您以这样一种方式编写代码，即看起来您正在发送非常

dict

对象）：

post_url = "http://localhost:6543/myservice"
data = {"problem": {"capacity": 60, "weights": [10, 20, 33], "values": [10, 3, 30]}}

data_json = json.dumps(data)
res = requests.post(post_url, json={"text": data_json}, headers=    {'Content-Type': 'application/json'})
print(res.text)
print(res.headers)

Output:
{'Connection': 'close', 'Content-Length': '20'}
Wrong capacity Value

res = requests.post(post_url,
    json=data, # not `data_json`
    ...)