I am using following code to download a csv file using Web API. Maximum file size will be less than 500mb. How can I improve this code?

[HttpPost, Route("api/files/getfile")]
public HttpResponseMessage GetDataFileResponse(string filePath) {
    try {

        FileStream fileStream = File.OpenRead(filePath);
        long fileLength = new FileInfo(filePath).Length;

        var response = new HttpResponseMessage();
        response.Content = new StreamContent(fileStream);
        response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
        response.Content.Headers.ContentDisposition.FileName = "mydata.csv";
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        response.Content.Headers.ContentLength = fileLength;
        return response;
    } catch (Exception e) {

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