Resource packs in Multiplayer don't work

I want to add a resource pack to mys erver, so in server.properties file I type the adress of the resource pack in the line 'resource-pack='. It looks like this 'resource-pack=http://www.mediafire.com/download/v59tdna54woiux5/resources.zip' and when I run the server the resource pack downloads but has no influence. When I stop the server , this is what i get in the 'resource-pack=' line: "resource-pack=http\://www.mediafire.com/download/v59tdna54woiux5/resources.zip" and the pack won't work.