Uploading to Amazon S3 using a signed URL works with curl but not in javascript

The issue was the 'Content-Header' which curl was not sending. Chrome sends this header regardless of whether you add it explicitly. To get a signed url that will work with this header you need to pass headers={'Content-Type':type} to generate_url in boto.

For me the problem was I was not setting the content-type while generating presigned URL, so added that while generating presigned url

java.util.Date expiration = new java.util.Date();        long msec = expiration.getTime();        msec +=  60 * 60 * 1000; // 1 hour.        expiration.setTime(msec);        GeneratePresignedUrlRequest generatePresignedUrlRequest =                new GeneratePresignedUrlRequest("bucket_name", "someRandomKey");        generatePresignedUrlRequest.setMethod(HttpMethod.PUT); // Default.        generatePresignedUrlRequest.setExpiration(expiration);        generatePresignedUrlRequest.setContentType("application/octet-stream");        URL s = s3Client.generatePresignedUrl(generatePresignedUrlRequest);        System.out.println("Secure PUT URL is "+s);

And here is the curl

curl -v -X PUT \  'generated_secure_url' \   -H 'Content-Type:application/octet-stream' \  --data-binary '@swiggy-hackathon.jpg'