HTTP 503 & other CORS errors trying to get some results

MusicBrainz Development
1

I am trying to get a bunch of covers from the MB API but I keep getting 503 errors and other CORS things:

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Does anybody know what my issue is? This is what I’m doing (hacky but it’s the best I can do with last.fm…)

async function getArt(
    trackMbid: string, 
    title: string, 
    artistMbid: string
): Promise<string | null> {
    let res = await fetch(`https://musicbrainz.org/ws/2/recording/${trackMbid}?inc=releases&fmt=json`).catch(() => null);
    if (!res || res.status === 503) return null;

    if (!res.ok) {
        let searchData = await (await fetch(`https://musicbrainz.org/ws/2/recording?query=recording:"${encodeURIComponent(title)}" AND arid:${artistMbid}&fmt=json`)).json();
        trackMbid = searchData.recordings?.[0]?.id;
        if (!trackMbid) return null;
        res = await fetch(`https://musicbrainz.org/ws/2/recording/${trackMbid}?inc=releases&fmt=json`).catch(() => null);
    }

    if (!res) return null;

    let response: Response = res;
    let data = await response.json();

    return data.releases?.[0]?.id ? `https://coverartarchive.org/release/${data.releases[0].id}/front` : null;
}

Thanks

2

You can install an extension that allows/ ignores all cors for localhost if it is just for you.
As alternative you could make it so your server makes the request instead of your browser.

3

I am going to be running this from the browser, there is no backend, it’s my personal portfolio site.

4

404s are likely because you request something not existing (check the mbid source, does it match an actual recording?).
503s are mainly because you didn’t respect MusicBrainz API / Rate Limiting - MusicBrainz

5 Likes
5

1 req/s is really low considering I am not planning on proxying this. Anything I can do?

6

I can usually get about 1-2 a second consistently, and more if just in short bursts. Try implementing some code to re-try calls and slow down every time one fails. Just don’t do this too often…

7

Actually you can do bursts of 5 req per 5 seconds. Altough I’m not able to recomend a rate limit package

1 Like