Linkedin uses status code 999 which leads to RangeError about fetch HOT 4 OPEN

Thanks for the above code.

If you construct a Response in JS directly and not via fetch it will error:

new Response('',{status:999})
// Uncaught RangeError: Response constructor: Invalid response status code.
//    <anonymous> debugger eval code:1

It looks to me like the host environment can accept wider range statuses than can be constructed with the Response class, this will take a bit of code juggling to solve.

To initialize a response, given a Response object response, ResponseInit init, and null or a body with type body:

If init["status"] is not in the range 200 to 599, inclusive, then throw a RangeError.

Source: https://fetch.spec.whatwg.org/#initialize-a-response

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999 is not allowed according to the fetch specification, can you try using the native fetch function and see what happens please?

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Thanks a lot for the fast reply.

I did what you suggested by using a local express server.

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.status(999).send('Hello World!')
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})

Then in the browser:

const ninenineninefetch = async () => {
    try {
        const response = await fetch('http://localhost:3000')
        const text = await response.text();
        console.log(response.status, text)
    } catch(e) {
        console.log('error', e)
    }
}
ninenineninefetch();

Which will output 999 'Hello World!' without triggering the catch.
Tried on Firefox and Chrome.

I also found this:
https://fetch.spec.whatwg.org/#statuses

Which states a status is in the range from 0 to 999.

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Any updates here? @JakeChampion

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