Here's an example of how to do a 301 Redirect with Nginx:
rewrite /blog/Content/2/8/581 /blog/post/java/dos-batch-files-compile-run-java-program-create-jar-file permanent;
As you can see, Nginx uses the keyword permanent instead of 301.
I just did a few hundred of these on this devdaily.com website. I put them in a separate "redirects.conf" file, and included that file into my main nginx.conf file like this: