Python - 请求 - POST 有效负载

Question

[Q] 请求库 - POST 负载：
嗨，我正在尝试将有效负载发布到网站。从开发控制台（网络选项卡）我发现它需要像这样的“请求有效负载”：
123:42["userData",{"name":"Doe","code":"","avatar":[9,31,13,-1],"join":"bz1nPvY09I1A","language":"English","createPrivate":false}]

我认为我正确地发送了数据，即使是 2 种不同的方式，但我收到了 404 错误：
#1 First way

url = "..."
payload = {"name":"John", "code":"", "avatar":[6,6,9,-1],
"join":"bz1nPvY09I1As", "language":"English", "createPrivate": "false"}

r = requests.post(url, data=payload) #NOTICE DATA=...
print(r.status_code)

#2 Sceond way

url = "..."
payload = {"name":"John", "code":"", "avatar":[6,6,9,-1],
"join":"bz1nPvY09I1As", "language":"English", "createPrivate": "false"}
data = json.dump(payload)

r = requests.post(url, json=data) #NOTICE JSON=
print(r.status_code)

为什么 404，payload 构造错误？