cors module causes a timeout in upstream

[maki3000]

cors module causes a timeout in upstream

[dougwilson]

Your code calls app.use but next calls next() inside, so requests will never move to the next middleware. Your code can just be simplified to the following:

const cors = require('cors');

    let allowedOrigins = [];
    if (process.env.NODE_ENV === "development") {
        allowedOrigins = [
            "http://www.example.local", 
            "https://www.example.local",
        ];
    } else if (process.env.NODE_ENV === "staging") {
        allowedOrigins = [
            "http://staging.example.com", 
            "https://staging.example.com", 
        ];
    } else if (process.env.NODE_ENV === "production") {
        allowedOrigins = [
            "http://www.example.com", 
            "https://www.example.com",  
        ];
    }
app.use(cors({
        credentials: true,
        origin: allowedOrigins,
        "Access-Control-Allow-Headers": "Origin, X-Requested-With, Access-Control-Max-Age, Content-Type, Accept",
        "Access-Control-Allow-Methods": "GET, POST, OPTIONS, DELETE, PUT",
}));

[maki3000]

Thank you very much @dougwilson

This is working splendid now. BTW, I forgot to use the right options for allowedHeaders and methods. So beneath to upper part of the last snippet, where I prepare allowedOrigins for different envs, I use now the cors module like this:

app.use(cors({
    credentials: true,
    origin: allowedOrigins,
    allowedHeaders: "Origin, X-Requested-With, Access-Control-Max-Age, Content-Type, Accept, x-cron-token, x-path",
    methods: "GET, POST, OPTIONS, DELETE, PUT",
}));