I have come across a website, freshbooks.com, which uses base64 encoded urls for all purposes, ranging from POSTing sensitive data to a URI or just viewing some resource.
For instance, a url to view an invoice on the website is (some part of url omitted for clarity):
When the string dmlld0ludm9pY2VGQjU1Mzc2 is decoded it gives viewInvoiceFB55376
Are there any reasons from security point of view to use URL in such format or just for some programming convenience. The only reason I can think is to prevent some automated tools to extract information about website design. If so, isn't this approach be characterized as security by obscurity?