![]() ![]() However, the host there is, which is not. Now, in that website, there is code like you posted above. Restated: you are hosting your website on, which delivers the website payload. If you run that nodejs code from the browser, it will block it due to the preflight OPTIONS request. Uploading and downloading work fine outside of the browser with js, python, and command line. This is only an in-browser issue due to modern browsers' CORS policies. Before it submits the POST request to the signed URL, it submits a preflight OPTIONS request, which does not return Access-Control-Allow-Origin headers, so it abandons the POST request to start the resumable upload. Yet the response still does not return Access-Control-Allow-Origin: ![]() So you can see it is explicitly asking for access-control-allow-origin, content-type headers it specifies origin and also sets sec-fetch-mode to cors. X-client-data: CJO2yQEIo7bJAQisncoBCNCvygEI/K/KAQiesMoBCL2wygEImbLKAQiLtMoBCJa1ygEI7bXKAQiAtsoBCL22ygEIjbrKAQjku8oBCPq7ygEIk73KAQiavcoBGKukygEYy7HKARiks8oBGLW6ygE= I believe I have gone through and checked everything here. Upload from command line using curl works: curl -v -I -X PUT -T file.csv -H 'Content-Type: application/octet-stream', so this appears to be a browser/cors/headers issue. Problem persists on retry, even several hours later. I've also tried adding maxAgeSeconds = 3600, method =, and 'Access-Control-Allow-Origin' to the 'responseHeader' array. It also happens with both the fetch API and Axios npm package. This happens locally, and while hosted on app engine. It looks like the signed URL uses the XML API by default, since the url is /? ( ), which is why I set the CORS above according to the documentation. Response headers include: alt-svc, cache-control, content-length, content-type, date, expires, server, status, vary, x-guploader-uploadid. When this is sent, it runs a preflight OPTIONS request, which does not return the Access-Control-Allow-Origin header in the response, so the PUT fails. 'Content-Type': 'application/octet-stream', # same error with file.type For example, on nginx, you can try to add these lines to /etc/nginx/nginx.# uploadUri is a signed uri from the 'test' bucket for uploading (PUT requests, v4) If you have access to the hosting server as admin then you need to allow CORS for the web server. Typically, this problem is solved by the external host setup. Go to browser console (Ctrl + Shift + i for Chrome) and check errors there. When you are trying to fetch a picture from external hosting it could be blocked by security reasons. The most common mistake while resource loading is CORS (Cross-Origin Resource Sharing) problem or Cross Domain. Image/audio/resource loading error while labeling You can run Docker Compose from the root directory of Label Studio to use PostgreSQL: docker-compose up -d, or see Sync data from cloud or database storage. If you want to upload a large volume of data (thousands of items), consider doing that at a time when people are not labeling or use a different database backend such as PostgreSQL or Redis. If you’re using the SQLite database and another user imports a large volume of data, labeling might slow down for other users on the server due to the database load. Troubleshoot project issue for general project issues. ![]() Troubleshoot import and export issues for issues related to loading or syncing data from cloud storage (including CORS issues) and pre-annotations.Troubleshoot machine learning if you’re using an ML backend.If you can’t find your issue here, check our other troubleshooting pages: If you encounter an issue while labeling, see if your issue is listed below. ![]()
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