CORS error when calling API multiple times using a loop

Question

I've been calling the same API but with different ids using loop.

However I get a CORS error.

This is more of an overview of what my code looks like:

getRequest(id:string) {
    return this.http.get(url+id, options);
}

tableOfIds = [...];

storeData = [];
tableOfIds.forEach(id => {
    this.serv.getRequest(id).subscribe(elements => {
        storeData.push(elements);
    });
});

Is there a way I can call a GET request (multiple times, with different parameters) without getting a CORS error?

The CORS error is very unlikely to be caused by your loop (doesn't matter if calling once or multiple times if Cross-Origin-Request) — hc_dev, Apr 01 '21 at 21:44
So if some requests get through and then others don't... rate limits are one possibility if it is a public api. Is it public or one you control? — charlietfl, Apr 01 '21 at 22:07
@charlietfl I can control. I've noticed some requests actually pass, but after a certain number of them, the CORS come. — WattMonki, Apr 01 '21 at 22:10
Maybe you need to throttle the requests. How many are you making roughly? Might want to check server logs also — charlietfl, Apr 01 '21 at 22:13
That's not many unless the processing server side is really intensive — charlietfl, Apr 01 '21 at 22:21
I looked at it more in-depth. It isn't a CORs issue, when I turned it off I got a 400 error. How I'm calling the api is the problem. I believe I have to write it asynchronously — WattMonki, Apr 02 '21 at 12:56
Found the error. Appended the headers. It's fixed now. Used Set instead of append — WattMonki, Apr 02 '21 at 17:11

score -2 · Answer 1 · answered Apr 01 '21 at 21:50

-2

CORS are Cross-Origin Resource Sharing used in controlling api calls from unfamiliar domains, is highly unlikely that it is caused by the loop. Check how to bypass cors in your application or tell the backend person to enable CORS in his app.

answered Apr 01 '21 at 21:50

Tochukwu Ogugua

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CORS error when calling API multiple times using a loop

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