core/play/src/main/java/play/mvc/Results.java
public static Result notFound(File content, boolean inline) {
    return notFound(content, inline, StaticFileMimeTypes.fileMimeTypes());
  }
public static Result notFound(File content, boolean inline) {
    return notFound(content, inline, StaticFileMimeTypes.fileMimeTypes());
  }
Generates a 404 Not Found result.

@param content The file to send.
@param inline Whether the file should be sent inline, or as an attachment.
@return the result