What characters can one use in a URL?

Question

I have an application that takes all the parameters in the url like this: /category/subcategory/sub-subcategory. I want to be able to give out extra parameters

Answer 1

You could use a dash or an underscore (these are used frequently). You could use any character you want to but for example, spaces turn into %20 in the url so they don't look too-nice.