Hi,

I installed drupal in a subdirectory \drupal6 and access it thru http:.///drupal6.

In this case open badges tries to access the site in the incorrect location (urls for baking do not contain the /drupal6/ prefix).

I had to add the following two RewriteRules to the apache server's httpd.conf

  RewriteRule ^/open_badges/assertion/(.*)$ /drupal6/open_badges/assertion/$1 [L,NE]
  RewriteRule ^/sites/default/files/open_badges/(.*)$ /drupal6/sites/default/files/open_badges/$1 [L,NE]

It would however be better if the open_badges module would issue the correct url's in the first place.

Btw thanks for the module, it's a good starter on open badges as after above fixes it just works!