nginx+uwsgi配置

Question

nginx配置文件：

server {
    listen 80;
    server_name 127.0.0.1; 
    charset  utf-8;
    index index.html index.htm index.nginx-debian.html;
    client_max_body_size 75M;

    location / {
        include uwsgi_params;
        uwsgi_pass 127.0.0.1:8000;
        uwsgi_param UWSGI_PYTHON /PycharmProjects/Flask/venv;
        uwsgi_param UWSGI_CHDIR /PycharmProjects/Flask;
        uwsgi_param UWSGI_SCRIPT run:app;
            
    }
}

uwsgi的文件配置：

[uwsgi]                                                     
socket = 127.0.0.1:8000                         
plugins = python                                        
chidir = /PycharmProjects/Flask                                   
wsgi-file = app.py                                       
callable = app 

Flask代码：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
    return "Hello World!"
if __name__ == "__main__":
    app.run(host='0.0.0.0', port=8080)

为什么在浏览器里面输入：127.0.0.1:80返回结果是：502 Bad Gateway
是哪里配置的不对吗？