Can frontend issues trigger CORS errors in web development?

Hey everyone! I’m working on a web project using NextJS for the frontend and Gin (Go) for the backend. I’ve run into a CORS error and I’m wondering if it could be coming from the frontend side. I’m using axios to talk to my Gin backend API.

Here’s a snippet of my code:

// DataFetcher.tsx
useEffect(() => {
  async function grabData() {
    setIsLoading(true);
    try {
      const result = await fetchItems(currentPageNum, itemsPerPage, apiEndpoint);
      updateItemList(result.data.items);
      updateTotalCount(result.data.item_count);
    } catch (err) {
      setErrorMessage('Failed to get data');
    } finally {
      setIsLoading(false);
    }
  }

  grabData();
}, [currentPageNum, itemsPerPage, apiEndpoint]);

// apiCalls.ts
export async function fetchItems(page, limit, endpoint) {
  try {
    const divider = endpoint.includes('?') ? '&' : '?';
    const fullUrl = `${endpoint}${divider}page=${page}&limit=${limit}&query`;
    const response = await api.get(fullUrl);
    return response.data;
  } catch (err) {
    console.error('Oops:', err);
  }
}

Has anyone run into CORS issues that were actually caused by frontend code? Any tips would be super helpful!

hey dude, i’ve seen cors errors appear from misconfigurations in the frontend. check if your axios isnt sending the proper headers and if the endpoint is right. if that doesnt cut it, probs the backend settings. best luck!

ooh, issue! have you tried using the network tab in devtools to see what’s goin on with the request? sometimes cors errors can be misleading. maybe the backend is returning an unexpected status code? also, double-check your api base url. what other troubleshooting steps have you taken so far?

While CORS issues are typically server-side, frontend configurations can indeed contribute to these errors. Have you verified your API base URL is correct and consistent across your application? It’s worth checking if you’re using any environment variables that might be causing discrepancies. Additionally, ensure your axios instance is properly configured with the correct baseURL and any necessary default headers. If you’re using a proxy in your NextJS setup, double-check its configuration as well. Lastly, consider implementing a custom axios interceptor to handle and log errors more effectively, which could provide more insight into the exact nature of the CORS issue you’re encountering.