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

The most recent URI spec is RFC 3986; see the ABNF for details on what characters are allowed in which parts for the URI.

The format for an absolute path part is:

  path-absolute = "/" [ segment-nz *( "/" segment ) ]
  segment       = *pchar
  segment-nz    = 1*pchar
  pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
  pct-encoded   = "%" HEXDIG HEXDIG
  unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
  sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
                      / "*" / "+" / "," / ";" / "="