HTTP URL - allowed characters in parameter names

Question

Is there any formal restriction as to which characters are allowed in URL parameter names?

I\'ve been reading RFC3986 (\"Uniform Resource Identifier (URI): Generic S

Answer 1

There are no restrictions on escaped parameter names in the URI specs. There might be restrictions in the server-side software that you use, though. This is especially true if you use “homemade” scripts to interpret URIs.