Writing a file to S3 bucket using pre-signed URL

S3FileWriter.java

public S3FileWriter {
    public String write(final ResultSet resultSet) {
        HttpURLConnection connection = null;
        
        try {
            StringBuilder csvContent = new StringBuilder();
            connection = httpURLConnectionHelper.newHttpURLConnection("<PRESIGNED_PUT_URL_FOR_FILE>");

            try (OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());
                 BufferedWriter writer = new BufferedWriter(out)
            ){
                // Iterate over result set and fetch the record and write that record.
                            writer.write(record);
                            writer.flush();
                // This is mandatory for the contect to be written to file.
                final int responseCode = connection.getResponseCode();

                if (responseCode != HttpStatus.SC_OK) {
                    throw new Exception();
                }
            }
        } catch (Exception e) {
            throw e;
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }

        // Writing is complete lets generate presigned URL for file download using AWS S3 client.
        // Close the ResultSet
        return presignedURLForDownload;
    }
}

what is httpURLConnectionHelper?

I guessed thats a class that I would have to implement, but why them is it written without capital letter?