Function resolve 

pub fn resolve(root: &Path, request_path: &str) -> Result<PathBuf, StaticError>

Resolve a request path under a root directory, canonicalizing the root first.

This is a convenience wrapper around resolve_with_canonical_root() that canonicalizes the root on every call. For production use where the root is fixed at startup, prefer Server::new() which canonicalizes the root once and reuses it for all requests.

Arguments

• root - The server root directory (need not be pre-canonicalized).
• request_path - The HTTP request path (e.g., /path/to/file.html).

Returns

• Ok(PathBuf) if the path resolves to a file within root.
• Err(StaticError) if the path is invalid, missing, or attempts traversal.
• Err(StaticError::Io) if canonicalizing the root fails.