Mark Jaquith

This simple plugin (no configuration) redirects <code>?s=FOO</code> search URLs to the nicer <code>/search/FOO</code> versions. Requires pretty permalinks.

Nice Search

Redirects search URLs from ?s=FOO  to /search/foo and converts spaces to + symbols

Web Guy

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Adds the canonical link to your site (<a href="https://wikipedia.org/wiki/Canonical_link_element" rel="nofollow ugc">Learn More</a>).
Activate and then set your permalinks to “Post name” under Settings > Permalinks. That’s it.
Verify that it’s working correctly with the <a href="https://addons.mozilla.org/addon/canonical-link/" rel="nofollow ugc">Firefox add-on</a>.
Supports the ability to customize the canonical link for any specific page, post, or even custom post types (including WooCommerce Products and bbPress Topics).

Nice Search vs Canonical Link