Make ServerRelativeArchivalRedirect easier to extend #57
Description
Archive-It found a issue with Referer header generated by Flash plugin for Firefox (ARI-4169) and wants to extend ServerRelativeArchivalRedirect with supplemental method for obtaining ArchivalUrl context. As the method depends on private JavaScript library it uses, we'd like to keep the enhancement local to Archive-It, for now. Unfortunately ServerRelativeArchivalRedirect does not have extension point to enable this.
Plan is to move the code in ServerRelativeArchivalRedirect that parses Referer into a new method, so that sub-class can override it.