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data-v-edd2eed8>Server Router</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-d8b57b2d data-v-9a6c75ad><div class="VPDoc has-sidebar has-aside" data-v-9a6c75ad data-v-e6f2a212><!--[--><!--]--><div class="container" data-v-e6f2a212><div class="aside" data-v-e6f2a212><div class="aside-curtain" data-v-e6f2a212></div><div class="aside-container" data-v-e6f2a212><div class="aside-content" data-v-e6f2a212><div class="VPDocAside" data-v-e6f2a212 data-v-cb998dce><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-cb998dce data-v-f610f197><div class="content" data-v-f610f197><div class="outline-marker" data-v-f610f197></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-f610f197>On this page</div><ul class="VPDocOutlineItem root" data-v-f610f197 data-v-53c99d69><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-cb998dce></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-e6f2a212><div class="content-container" data-v-e6f2a212><!--[--><!--]--><main class="main" data-v-e6f2a212><div style="position:relative;" class="vp-doc _flash_request-handler" data-v-e6f2a212><div><h1 id="⚙️-request-handler" tabindex="-1">⚙️ Request Handler <a class="header-anchor" href="#⚙️-request-handler" aria-label="Permalink to "⚙️ Request Handler""></a></h1><p>In this section, we illustrate the powerful concept of <code>RequestHandler</code> in Flash, which are used to handle incoming requests and generate responses.</p><h2 id="creating-a-request-handler" tabindex="-1">Creating a Request Handler <a class="header-anchor" href="#creating-a-request-handler" aria-label="Permalink to "Creating a Request Handler""></a></h2><p>To create a custom request handler, you need to extend the <code>RequestHandler</code> class and annotate the class with the <code>RouteInfo</code> annotation, specifying the HTTP method that the handler will respond to and the relative path that the handler will be registered to. The <code>enforceNonNullBody</code> attribute is used to specify whether the handler expects a non-null request body: by default, it is set to <code>false</code>. After that, you must override the <code>handle</code> method; The <code>handle</code> method is where you define the logic for processing the request and generating the response. The <code>req</code> (request) and <code>res</code> (response) objects are available in the handler to access the request data and send the response back to the client.</p><p>You must call the super constructor with the <code>req</code> and <code>res</code> objects to initialize the handler.</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> flash.Request;</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> flash.Response;</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> flash.RequestHandler;</span></span>
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<span class="line"></span>
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<span class="line highlighted"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">RouteInfo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">method</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> HttpMethod.GET, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">path</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "/hello"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">enforceNonNullBody</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> false</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MyHandler</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> extends</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> RequestHandler</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> public</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MyHandler</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(Request </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">req</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, Response </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">res</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
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<span class="line highlighted"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> super</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(req, res);</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> @</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">Override</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Object </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">handle</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() {</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> String response </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "Hello, world!"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> response;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><div class="warning custom-block"><p class="custom-block-title">WARNING</p><p>Any logic that needs to be executed before the request handler is registered must be done within the constructor.</p></div><h2 id="request-handler-methods" tabindex="-1">Request Handler methods <a class="header-anchor" href="#request-handler-methods" aria-label="Permalink to "Request Handler methods""></a></h2><p>The <code>RequestHandler</code> class provides several methods that can be used to interact with the request and response objects easily and safely. Following are listed the methods available in the <code>RequestHandler</code> class, with a brief description of their purpose:</p><table tabindex="0"><thead><tr><th>Method</th><th>Params</th><th>Description</th></tr></thead><tbody><tr><td><code>getRequestBody()</code></td><td><code>none</code></td><td>Returns a <code>JSONObject</code> representation of the request body.</td></tr><tr><td><code>getSpecification()</code></td><td><code>none</code></td><td>Returns an instance of <code>HandlerSpecification</code> containing all sorts of information about the handler.</td></tr><tr><td><code>expectedRequestParameter()</code></td><td><code>String name, description</code></td><td>Returns an instance of <code>ExpectedRequestParameter</code> for the specified parameter name.</td></tr><tr><td><code>expectedBodyField()</code></td><td><code>String name, description</code></td><td>Returns an instance of <code>ExpectedBodyField</code> for the specified field name.</td></tr><tr><td><code>expectedBodyFile()</code></td><td><code>String name, description</code></td><td>Returns an instance of <code>ExpectedBodyFile</code> for the specified file name.</td></tr></tbody></table><p>(More on the <code>ExpectedRequestParameter</code>, <code>ExpectedBodyField</code>, and <code>ExpectedBodyFile</code> classes in the next section).</p></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link prev" href="/flash/server-types.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Previous page</span><span class="title" data-v-1bcd8184>Server Types</span><!--]--></a></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/flash/request-response.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>Request and Response</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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