Web browsers may display "mixed content" warnings in the address bar when an HTTPS (secure) webpage contains images, iframes, or other resources from HTTP (non-secure) source URLs on other websites. This may cause the whole page to be delivered insecurely.
URL aliases
When a path changes, redirect
Sometimes a path or URL alias change is necessary. You can minimize the impact of the change by taking these steps:
Paths
By default Drupal assigns each page a path (web address) like: http://www.example.org/node/1
Pages are numbered in the order they were created.
Pages can receive fancier URLs
Your Drupal site will automatically create a URL alias (non-numerical path) for each page like: http://www.example.org/your-page-topic
URL aliases are more visitor- and search engine-friendly than numerical paths.
Drupal content (pages for Articles, Basic Pages, Events, Photo Albums & Galleries, aka "nodes") is stored in a database, so the pages do not have a traditional folder/file structure.
Every page gets a number
By default Drupal assigns each page an address like: http://www.example.org/node/1
Pages are numbered in the order they were created.