Did API v1 of Erp.BO.PartSvc/Parts Change Over the Weekend?

So I just did a bunch of tests with an nginx Proxy

 proxy_pass https://myEpicor.stephengould.com; #Works Fine
 proxy_pass https://myEpicor.stephengould.com$uri$is_args$args;

blows up erro 400, Bad Gateway (if the part has slashes)

location / {
    set $backend "https://myEpicor.stephengould.com";
    proxy_pass $backend$uri$is_args$args;

}

Gives a Path Undefined Error (for slash parts) 404

         proxy_pass https://myEpicor.stephengould.com;
         proxy_set_header X-Original-URI $request_uri;
    # Force nginx to use the normalized URI
         rewrite ^ $uri break;

Also gives an error if slashes are included

So… Im’ not sure what this proves other than yes if you configure the nginx Linux proxy (incorrectly) you can get it to pass in the decoded URI and it will cause Epicor to balk wiht a 400,500, and or a 404 Error.