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<title data-rh="true">How to Implement Fixed Window Rate Limiting using Redis | The Home of Redis Developers</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:image" content="https://developer.redis.com/img/redis-hero-image.jpg"><meta data-rh="true" name="twitter:image" content="https://developer.redis.com/img/redis-hero-image.jpg"><meta data-rh="true" property="og:url" content="https://developer.redis.com/develop/java/spring/rate-limiting/fixed-window"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="How to Implement Fixed Window Rate Limiting using Redis | The Home of Redis Developers"><meta data-rh="true" name="description" content="The simplest approach to build a rate limiter is the &quot;fixed window&quot; implementation in which we cap the"><meta data-rh="true" property="og:description" content="The simplest approach to build a rate limiter is the &quot;fixed window&quot; implementation in which we cap the"><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://developer.redis.com/develop/java/spring/rate-limiting/fixed-window"><link data-rh="true" rel="alternate" href="https://developer.redis.com/develop/java/spring/rate-limiting/fixed-window" hreflang="en"><link data-rh="true" rel="alternate" href="https://developer.redis.com/develop/java/spring/rate-limiting/fixed-window" hreflang="x-default"><script>!function(e,t,a,n,g){e[n]=e[n]||[],e[n].push({"gtm.start":(new Date).getTime(),event:"gtm.js"});var m=t.getElementsByTagName(a)[0],r=t.createElement(a);r.async=!0,r.src="https://www.googletagmanager.com/gtm.js?id=GTM-W8Z6BLQ",m.parentNode.insertBefore(r,m)}(window,document,"script","dataLayer")</script><link rel="stylesheet" href="/assets/css/styles.b5561ee1.css">
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rate limit at the hour and minute levels, say, allowing a maximum of 2,000 request per hour, and a maximum of 33 requests
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per minute.</p><p>This basic recipe using Redis Strings, a minute-size window and a quota of 20 requests is outlined on
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the <a href="https://redis.com/redis-best-practices/basic-rate-limiting/" target="_blank" rel="noopener noreferrer">Redis Blog</a>. I&#x27;ll summarize it here before we jump
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into out Spring Reactive implementation:</p><ol><li><code>GET [user-api-key]:[current minute number]</code> such as <code>GET &quot;u123:45&quot;</code></li><li>If the result from line 1 is less than 20 (or the key is not found) go to step 4 otherwise continue to step 3</li><li>Reject the request.</li><li>In an atomic way (using <code>MULTI</code> and <code>EXEC</code>) increment the key and set the expiry to 59 seconds into the future.</li></ol><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">MULTI</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INCR [user-api-key]:[current minute number]</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">EXPIRE [user-api-key]:[current minute number] 59</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">EXEC</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><ol start="5"><li>Otherwise, fulfill the request.</li></ol><p>Ok, now that we know the basic recipe, let&#x27;s implement it in <a href="/develop/java/spring/rate-limiting/fixed-window/reactive">Spring</a></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/redis-developer/redis-developer/edit/master/docs/develop/java/spring/rate-limiting/fixed-window/index-fixed-window.mdx" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2022-11-10T17:16:41.000Z">Nov 10, 2022</time></b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/develop/java/spring/rate-limiting"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Overview</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/develop/java/spring/rate-limiting/fixed-window/reactive"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Reactive Implementation</div></a></nav></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container"><svg width="785" height="158" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="shape"><defs><path d="M786.344 392.459c-41.822 22.164-258.313 110.84-305.056 135.477-46.742 24.637-72.163 23.812-108.246 6.57-36.082-17.24-267.334-111.664-309.156-131.377-41.822-19.713-42.642-33.657-1.64-49.271C103.25 338.265 332.86 247.94 381.243 229.875c48.383-18.065 65.604-18.065 106.605-2.473 41.003 15.614 256.674 100.996 297.676 115.785 41.002 14.791 42.642 27.912.82 49.273v-.001z" id="a"></path><mask id="b" maskContentUnits="userSpaceOnUse" maskUnits="objectBoundingBox" x="0" y="0" width="785" height="331" fill="#fff"><use xlink:href="#a"></use></mask></defs><use mask="url(#b)" xlink:href="#a" transform="translate(-32 -216)" stroke="#465282" stroke-width="4" fill="none" fill-rule="evenodd" stroke-dasharray="3.637"></use></svg><img src="/img/code-2.png" class="code" alt=""><div class="row"><div class="col col--3"><div class="footer__logo-ctr"><span class="footer__logo-tagline">Made with &lt;/&gt; 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into out Spring Reactive implementation:</p><ol><li><code>GET [user-api-key]:[current minute number]</code> such as <code>GET &quot;u123:45&quot;</code></li><li>If the result from line 1 is less than 20 (or the key is not found) go to step 4 otherwise continue to step 3</li><li>Reject the request.</li><li>In an atomic way (using <code>MULTI</code> and <code>EXEC</code>) increment the key and set the expiry to 59 seconds into the future.</li></ol><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">MULTI</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INCR [user-api-key]:[current minute number]</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">EXPIRE [user-api-key]:[current minute number] 59</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">EXEC</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><ol start="5"><li>Otherwise, fulfill the request.</li></ol><p>Ok, now that we know the basic recipe, let&#x27;s implement it in <a href="/develop/java/spring/rate-limiting/fixed-window/reactive">Spring</a></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/redis-developer/redis-developer/edit/master/docs/develop/java/spring/rate-limiting/fixed-window/index-fixed-window.mdx" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2022-11-10T17:16:41.000Z">Nov 10, 2022</time></b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/develop/java/spring/rate-limiting"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Overview</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/develop/java/spring/rate-limiting/fixed-window/reactive"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Reactive Implementation</div></a></nav></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container"><svg width="785" height="158" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="shape"><defs><path d="M786.344 392.459c-41.822 22.164-258.313 110.84-305.056 135.477-46.742 24.637-72.163 23.812-108.246 6.57-36.082-17.24-267.334-111.664-309.156-131.377-41.822-19.713-42.642-33.657-1.64-49.271C103.25 338.265 332.86 247.94 381.243 229.875c48.383-18.065 65.604-18.065 106.605-2.473 41.003 15.614 256.674 100.996 297.676 115.785 41.002 14.791 42.642 27.912.82 49.273v-.001z" id="a"></path><mask id="b" maskContentUnits="userSpaceOnUse" maskUnits="objectBoundingBox" x="0" y="0" width="785" height="331" fill="#fff"><use xlink:href="#a"></use></mask></defs><use mask="url(#b)" xlink:href="#a" transform="translate(-32 -216)" stroke="#465282" stroke-width="4" fill="none" fill-rule="evenodd" stroke-dasharray="3.637"></use></svg><img src="/img/code-2.png" class="code" alt=""><div class="row"><div class="col col--3"><div class="footer__logo-ctr"><span class="footer__logo-tagline">Made with &lt;/&gt; 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