https://sinatrarb.com/intro.html



<span class="n">在路由使用fliter
before</span> <span class="ss">:agent</span> <span class="o">=&gt;</span> <span class="sr">/Songbird/</span> <span class="k">do</span>
<span class="c1"># ...</span>
<span class="k">end</span>
<span class="n">after</span> <span class="s1">&#39;/blog/*&#39;</span><span class="p">,</span> <span class="ss">:host_name</span> <span class="o">=&gt;</span> <span class="s1">&#39;example.com&#39;</span> <span class="k">do</span>
<span class="c1"># ...</span>
<span class="k">end</span>





例如：








<span class="n">before</span> <span class="k">do</span>
<span class="vi">@note</span> <span class="o">=</span> <span class="s1">&#39;Hi!&#39;</span>
<span class="n">request</span><span class="p">.</span><span class="nf">path_info</span> <span class="o">=</span> <span class="s1">&#39;/foo/bar/baz&#39;</span>
<span class="k">end</span>
<span class="n">get</span> <span class="s1">&#39;/foo/*&#39;</span> <span class="k">do</span>
<span class="vi">@note</span> <span class="c1">#=&gt; &#39;Hi!&#39;</span>
<span class="n">params</span><span class="p">[</span><span class="s1">&#39;splat&#39;</span><span class="p">]</span> <span class="c1">#=&gt; &#39;bar/baz&#39;</span>
<span class="k">end</span>





<span class="k">或者进行身份验证：</span>








<span class="n">before</span> <span class="s1">&#39;/protected/*&#39;</span> <span class="k">do</span>
<span class="n">authenticate!</span>
<span class="k">end</span>
<span class="n">after</span> <span class="s1">&#39;/create/:slug&#39;</span> <span class="k">do</span> <span class="o">|</span><span class="n">slug</span><span class="o">|</span>
<span class="n">session</span><span class="p">[</span><span class="ss">:last_slug</span><span class="p">]</span> <span class="o">=</span> <span class="n">slug</span>
<span class="k">end</span>


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