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copied!<p>Hash params are useful for single page javascript applications, it allows javascript to present the user with a sharable url for state of the application. This is preferred because if you have a single page javascript application and users navigate and load more content via ajax and share the url, without the hash or a push state modification the person receiving the content would get the homepage or starting state. Hash params can be amended easily and read by javascript without reloading the page.</p> <p>Hash parameters are usually only used on the client side, hash params wont be passed to the server... so they are only useful for parameterization to the client.</p> <pre><code>/users#!/13 </code></pre> <p>would load the user index page and then javascript could read the hash</p> <p><code>window.location.hash</code> and pass it through some sort of client side router and make an appropriate ajax request and possibly load the user show template and push it to the dom.</p> <p>Url params and url path are somewhat interchangeable. People usually use url path for describing restful resources such as</p> <pre><code>/users/[:id] => /users/13 => /users?id=13 /users/:id/posts => /users/13/posts /users/:user_id/posts/:id => /users/13/posts/22 etc...... </code></pre> <p>@Walter Tross, made a good point from an SEO point of view. Slugged urls or "URL Params" are more indexable by crawlers and tend to rank higher.</p> <p>For params that do not fit in a resourceful route we send them as params</p> <pre><code>/users?sort=user_name&order=asc </code></pre>

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