Minimal URL encoding test: isolate one special character

To reproduce a URL Encoder issue, use a harmless value containing the smallest special character that fails, such as a space, &, +, /, or a non-ASCII letter. State whether it is a query value or path segment; those contexts have different rules. Encode, decode, and compare the exact result. Then place the encoded value in a complete example URL to see whether the receiver parses it as intended. Avoid real credentials in the sample.