Minikube上的入口控制器未正确路由烧瓶POST请求

Question

我有一个简单的Flask应用。当我通过端口转发将HTTP Post请求直接发送到服务时，它工作正常。

from flask import Flask, request
import redis
from rq import Queue
from worker import job_worker

UPLOAD_FOLDER = './uploads/'

app = Flask(__name__)

r = redis.Redis()
q = Queue(connection = r)

@app.route('/', methods=['POST'])
def upload():
    scale = int(request.form['scale'])
    q.enqueue(job_worker, scale)
    return ""

if __name__ == "__main__":
    app.run()

我还在nginx容器中有一个简单的index.html文件，该文件在端口80上提供。它对“ / upload”执行ajax POST请求。如果您查看入口控制器，应该将其转换为端口5000请求并去除“上传”烧瓶应用程序在端口5000处提供服务

这里是入口控制器：

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: emoji-ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - http:
      paths:
      - path: /upload
        backend:
          serviceName: emoji-backend
          servicePort: 5000
      - path: /
        backend:
          serviceName: emoji-frontend
          servicePort: 80

为了完整起见，表情符号后端服务：

apiVersion: v1
kind: Service
metadata:
  name: emoji-backend
  labels:
    app: emoji-backend
    tier: backend
spec:
  type: LoadBalancer
  ports:
  - port: 5000
  selector:
    app: emoji-backend
    tier: backend

我得到一个502错误的网关，没有任何指示，除了入口日志确实说了这句话：

2019/09/29 21:41:04 [error] 2021#2021: *78651 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.64.1, server: _, 
request: "POST /upload HTTP/2.0", upstream: "http://172.17.0.4:5000/", host: "192.168.64.5", referrer: "https://192.168.64.5/"

“ http://172.17.0.4:5000/”是emoji后端服务的正确端点和端口。