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Cloudflare API upload to R2 shows file type as application/octet-stream

Problem​

As shown in the image, I'm using Java's aws-java-sdk-s3 to upload to CF's R2, but the file type displays as application/octet-stream

<dependency>
    <groupId>com.amazonaws</groupId>
    <artifactId>aws-java-sdk-s3</artifactId>
    <version>1.12.701</version>
</dependency>

Solution​

Add metadata when uploading

Upload code:

    public void uploadFile(String identifier, InputStream inputStream, ObjectMetadata metadata) {
        PutObjectRequest putObjectRequest = new PutObjectRequest(this.bucket, identifier, inputStream, metadata);
        this.client.putObject(putObjectRequest);
    }

Added metadata:


ObjectMetadata metadata = new ObjectMetadata();
metadata.setHeader("Content-Type", "application/json");