Heroku Node.js和uWebsockets.js R10错误，绑定端口失败

Question

我已经创建了一个最小的应用程序，用于测试在heroku上部署node.js uWebsockets.js服务器和dockerfile。Heroku日志显示它失败，出现R10(引导超时(错误，未能绑定到$PORT，尽管之前的日志显示它正在该端口侦听。

server.js

const uWS = require('uWebSockets.js');
const port = process.env.PORT || 9001;
const host = '0.0.0.0'
const app = uWS.App()
.ws('/*', {
maxPayloadLength: 16 * 1024 * 1024,
idleTimeout: 160,
})
.listen(port, host, (token) => {
if (token) {
console.log('Listening to port ' + port);
} else {
console.log('Failed to listen to port ' + port);
}
});

Dockerfile

# syntax=docker/dockerfile:1
FROM node:17.0.1
ENV NODE_ENV=production
WORKDIR /app
COPY ["package.json", "package-lock.json*", "./"]
RUN npm install --production
COPY . .
EXPOSE $PORT
CMD [ "npm", "start" ]

Heroku日志

2021-12-02T15:34:50.509492+00:00 app[web.1]: > dummyserver@1.0.0 start
2021-12-02T15:34:50.509492+00:00 app[web.1]: > node server.js
2021-12-02T15:34:50.509492+00:00 app[web.1]: 
2021-12-02T15:34:50.586940+00:00 app[web.1]: Listening to port 39686
2021-12-02T15:35:49.393274+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2021-12-02T15:35:49.424793+00:00 heroku[web.1]: Stopping process with SIGKILL
2021-12-02T15:35:49.596430+00:00 heroku[web.1]: Process exited with status 0

我尝试过的东西：

1. 使用了process.env.PORT
2. 已将主机用作0.0.0.0
3. 直接推给heroku而不是码头文件

Answer 1

我做了很多更改，但我认为这是一个docker问题，将我的dockerfile更改为下面的代码段使其生效。

# syntax=docker/dockerfile:1
FROM node:17.0.1
WORKDIR /app
COPY "package.json" .
RUN npm install
COPY . .
EXPOSE $PORT
CMD [ "npm", "start" ]

还确保使用wss://app-name.herokuapp.com而不是要连接的前端上的ws://。