HTTP Accept header only accepts singular value

[quick-pawiromitchel]

Description

The axios library passes multiple Accept Header values like so

curl -H 'Accept: application/json, text/plain, */*' -H 'User-Agent: axios/0.27.2' -H 'Connection: close' IP:PORT

This results in

{
  "code": 400,
  "message": "BAD_REQUEST: Unsupported endpoint version: v2",
  "stacktraces": []
}

Replacing the Accept header with a single value like application/json, the call will work as intended.
A similar issue is found here #3114

Version

Lighthouse v4.1.0-693886b

Steps to resolve

By overriding the Accept header, the call will go through successfully

const axios = require('axios');

axios.get('http://IP:PORT/eth/v2/beacon/blocks/finalized', {
    headers: {
        'Accept': '*/*'
    }
})
    .then(data => {
        console.log('Data:', data);
    })
    .catch(error => {
        console.error('There was a problem with the fetch operation:', error);
    });

[quick-pawiromitchel]

Related to #3114

[michaelsproul]

Should be fixed by #4216

I'll try to get that reviewed for v4.2.1/v4.3.0

[quick-pawiromitchel]

Awesome, thank you 💯

[jmcph4]

@quick-pawiromitchel This seems solved now that #4216 has landed in 4.3.0.

For me locally:

$ curl -H 'Accept: application/json, text/plain, */*' -H 'User-Agent: axios/0.27.2' -H 'Connection: close' 0.0.0.0:8080
{"code":404,"message":"NOT_FOUND","stacktraces":[]}