[{"data":1,"prerenderedAt":918},["ShallowReactive",2],{"content:\u002Fadvanced-caching-strategies-cdn-architecture\u002Fcdn-edge-caching-configuration\u002F":3,"surroundings:\u002Fadvanced-caching-strategies-cdn-architecture\u002Fcdn-edge-caching-configuration\u002F":910},{"id":4,"title":5,"body":6,"description":903,"extension":904,"meta":905,"navigation":491,"path":906,"seo":907,"stem":908,"__hash__":909},"content\u002Fadvanced-caching-strategies-cdn-architecture\u002Fcdn-edge-caching-configuration\u002Findex.md","CDN Edge Caching Configuration: Frontend Asset Delivery & Performance Tuning",{"type":7,"value":8,"toc":888},"minimark",[9,13,23,28,60,76,80,91,94,98,131,144,148,151,162,166,169,176,180,187,211,215,220,452,458,462,650,655,659,789,794,798,836,840,849,861,874,884],[10,11,5],"h1",{"id":12},"cdn-edge-caching-configuration-frontend-asset-delivery-performance-tuning",[14,15,16,17,22],"p",{},"Modern frontend architectures rely heavily on distributed delivery networks to minimize latency and maximize throughput. Proper ",[18,19,21],"a",{"href":20},"\u002Fadvanced-caching-strategies-cdn-architecture\u002F","CDN Edge Caching Configuration"," is not merely about setting expiration headers; it requires precise rule orchestration, diagnostic validation, and protocol alignment. This guide provides a step-by-step engineering workflow for configuring edge caches specifically for frontend bundles, static assets, and dynamic API payloads. We will establish explicit performance thresholds, provide runnable configuration snippets for major providers, and outline diagnostic procedures to validate cache efficiency before deployment.",[24,25,27],"h2",{"id":26},"_1-edge-cache-architecture-ttl-thresholds","1. Edge Cache Architecture & TTL Thresholds",[14,29,30,31,35,36,39,40,43,44,47,48,51,52,55,56,59],{},"The foundation of edge caching lies in Time-To-Live (TTL) alignment with asset volatility. Frontend engineers must categorize build outputs from Vite or Webpack into immutable, versioned, and dynamic tiers. Immutable assets (e.g., content-hashed JS\u002FCSS bundles like ",[32,33,34],"code",{},"app.a1b2c3d4.js",") should enforce ",[32,37,38],{},"max-age=31536000"," with ",[32,41,42],{},"immutable"," directives. This eliminates conditional ",[32,45,46],{},"If-None-Match"," requests entirely, reducing origin load by ~90% for static resources. Versioned assets (e.g., non-hashed images or legacy polyfills) require ",[32,49,50],{},"max-age=86400"," to ",[32,53,54],{},"max-age=604800"," depending on release cadence. Dynamic payloads (e.g., JSON configs, user-specific data) must leverage ",[32,57,58],{},"stale-while-revalidate"," to maintain sub-100ms response times during origin fetches.",[14,61,62,63,67,68,71,72,75],{},"Misaligned TTLs directly degrade cache hit ratios and increase origin load. For a comprehensive breakdown of directive syntax and browser-CDN interaction, consult ",[18,64,66],{"href":65},"\u002Fadvanced-caching-strategies-cdn-architecture\u002Fhttp-cache-control-headers-explained\u002F","HTTP Cache-Control Headers Explained",". Establish a baseline threshold: target a cache hit ratio >85% for static assets and >60% for dynamic API routes. Monitor ",[32,69,70],{},"X-Cache"," or ",[32,73,74],{},"CF-Cache-Status"," headers via Real User Monitoring (RUM) to validate rule propagation across edge nodes. If hit ratios fall below thresholds, audit cache key fragmentation before adjusting TTLs.",[24,77,79],{"id":78},"_2-diagnostic-workflow-cache-hit-ratio-ttfb-analysis","2. Diagnostic Workflow: Cache Hit Ratio & TTFB Analysis",[14,81,82,83,86,87,90],{},"Before deploying new edge rules, implement a diagnostic workflow to isolate bottlenecks. Begin by auditing current cache status headers across your top 20 traffic paths using ",[32,84,85],{},"curl -I"," or browser DevTools Network tab. Use synthetic monitoring (e.g., WebPageTest, Lighthouse CI) to measure Time-To-First-Byte (TTFB) from geographically distributed probes. If TTFB exceeds 150ms for cached assets, investigate origin shielding, cache key fragmentation, or ",[32,88,89],{},"Vary"," header misconfiguration.",[14,92,93],{},"Implement a phased rollout: deploy rules to a staging subdomain, run load tests with k6 or Artillery, and compare cache hit ratios against production baselines. For actionable methodologies on diagnosing latency spikes at the network edge, reference How to reduce TTFB using edge caching rules. Set explicit alert thresholds in your observability stack: trigger warnings when cache hit ratio drops below 75% for 10 consecutive minutes, or when TTFB P95 exceeds 200ms for static resources. Correlate these alerts with Core Web Vitals regressions to prioritize remediation.",[24,95,97],{"id":96},"_3-configuring-edge-rules-for-frontend-bundles","3. Configuring Edge Rules for Frontend Bundles",[14,99,100,101,104,105,108,109,112,113,116,117,71,120,123,124,104,127,130],{},"Edge rule configuration must account for SPA routing, asset fingerprinting, and fallback behaviors. Configure path-based rules to intercept ",[32,102,103],{},"\u002Fassets\u002F",", ",[32,106,107],{},"\u002Fstatic\u002F",", and ",[32,110,111],{},"\u002F*.js"," requests, applying immutable caching policies. For SPA fallbacks (e.g., ",[32,114,115],{},"index.html","), enforce ",[32,118,119],{},"no-cache",[32,121,122],{},"max-age=0"," to ensure route updates propagate immediately without requiring full cache purges. Implement cache key normalization to strip tracking parameters (",[32,125,126],{},"?utm_*",[32,128,129],{},"?fbclid",") that fragment cache storage and artificially inflate origin bandwidth.",[14,132,133,134,136,137,71,140,143],{},"Use edge-side includes (ESI) or lightweight worker scripts to dynamically inject user-specific headers without bypassing the cache entirely. Validate configurations using provider-specific CLI tools or API endpoints before committing to production. Ensure rules do not conflict with origin ",[32,135,89],{}," headers, which can cause unintended cache misses when the CDN treats identical URLs as distinct objects based on ",[32,138,139],{},"Accept-Encoding",[32,141,142],{},"User-Agent",". Always test SPA hydration under simulated 3G throttling to verify that fallback routing does not trigger infinite redirect loops or stale shell delivery.",[24,145,147],{"id":146},"_4-protocol-optimization-resource-prioritization","4. Protocol Optimization & Resource Prioritization",[14,149,150],{},"CDN edge nodes act as the first point of contact for TLS negotiation and HTTP protocol selection. Optimize connection reuse by enabling TLS 1.3 and HTTP\u002F2 multiplexing at the edge. For critical render-blocking resources, evaluate whether edge-level resource hints outperform origin directives. While modern browsers have deprecated server push, strategic preload headers injected via edge workers can still reduce critical path latency. Compare implementation trade-offs using Using HTTP\u002F2 server push vs preload effectively.",[14,152,153,154,157,158,161],{},"Configure edge workers to inject ",[32,155,156],{},"\u003Clink rel=\"preload\">"," for above-the-fold CSS and font files only. Monitor ",[32,159,160],{},"performance.getEntriesByType('resource')"," APIs to verify that preloaded assets are utilized within 500ms of navigation start; otherwise, disable the rule to conserve bandwidth and avoid priority inversion. Align preload directives with your build system's chunk splitting strategy to prevent over-fetching. Validate Lighthouse \"Avoid chaining critical requests\" and \"Reduce unused CSS\" audits post-deployment to confirm protocol optimizations yield measurable FCP\u002FLCP improvements.",[24,163,165],{"id":164},"_5-tls-handshake-session-resumption-tuning","5. TLS Handshake & Session Resumption Tuning",[14,167,168],{},"Even with optimal caching, unoptimized TLS handshakes can negate edge performance gains. Configure edge nodes to enforce TLS 1.3, which reduces round trips by combining key exchange and authentication into a single flight. Enable session tickets and session IDs for connection resumption, targeting a resumption rate >70% for returning users. Disable legacy cipher suites (e.g., RC4, 3DES, CBC modes) and enforce forward secrecy (ECDHE). Use OCSP stapling at the edge to eliminate certificate validation latency during initial connections.",[14,170,171,172,175],{},"For detailed implementation steps on minimizing cryptographic overhead, review Reducing TLS handshake time with session resumption. Set performance thresholds: TLS handshake time must remain \u003C100ms on 4G networks, and full connection establishment (TCP + TLS) should not exceed 150ms for cached routes. Monitor ",[32,173,174],{},"chrome:\u002F\u002Fnet-export"," traces or Wireshark captures to verify 0-RTT resumption success rates. If handshake latency spikes during traffic surges, scale edge node capacity or adjust keep-alive timeouts to prevent connection pool exhaustion.",[24,177,179],{"id":178},"_6-service-worker-edge-cache-coordination","6. Service Worker & Edge Cache Coordination",[14,181,182,183,186],{},"Frontend applications often deploy dual caching layers: the CDN edge and the client-side service worker. Without coordination, these layers can conflict, causing stale content delivery or unnecessary network requests. Implement a cache-first strategy at the edge for versioned assets, while the service worker handles offline fallback and dynamic route caching. Use ",[32,184,185],{},"Cache-Control: stale-while-revalidate"," to allow the service worker to serve cached responses while fetching updates in the background.",[14,188,189,190,193,194,197,198,202,203,206,207,210],{},"Align cache invalidation strategies: when deploying a new build, purge edge caches for hashed assets and send a ",[32,191,192],{},"skipWaiting"," signal to active service workers via ",[32,195,196],{},"postMessage",". For architectural patterns that synchronize client and edge layers, study ",[18,199,201],{"href":200},"\u002Fadvanced-caching-strategies-cdn-architecture\u002Fservice-worker-caching-strategies\u002F","Service Worker Caching Strategies",". Validate coordination by simulating offline\u002Fonline transitions in Chrome DevTools and verifying that asset versions match across both layers using ",[32,204,205],{},"caches.keys()"," and ",[32,208,209],{},"navigator.serviceWorker.controller",". Implement a version handshake in your app shell to prevent mixed-version asset loading during incremental deployments.",[24,212,214],{"id":213},"code-examples","Code Examples",[216,217,219],"h3",{"id":218},"cloudflare-page-rules-for-immutable-assets","Cloudflare Page Rules for Immutable Assets",[221,222,227],"pre",{"className":223,"code":224,"language":225,"meta":226,"style":226},"language-json shiki shiki-themes github-dark-high-contrast github-dark-high-contrast github-light-high-contrast","{\n \"rules\": [\n {\n \"target\": \"*yourdomain.com\u002Fassets\u002F*\",\n \"actions\": [\n { \"id\": \"cache_level\", \"value\": \"cache_everything\" },\n { \"id\": \"edge_cache_ttl\", \"value\": 31536000 },\n { \"id\": \"browser_cache_ttl\", \"value\": 31536000 }\n ]\n },\n {\n \"target\": \"*yourdomain.com\u002Findex.html\",\n \"actions\": [\n { \"id\": \"cache_level\", \"value\": \"bypass\" },\n { \"id\": \"browser_cache_ttl\", \"value\": 0 }\n ]\n }\n ]\n}\n","json","",[32,228,229,238,248,254,270,278,305,329,352,358,363,368,380,387,409,431,436,441,446],{"__ignoreMap":226},[230,231,234],"span",{"class":232,"line":233},"line",1,[230,235,237],{"class":236},"s3sCt","{\n",[230,239,241,245],{"class":232,"line":240},2,[230,242,244],{"class":243},"sj_b3"," \"rules\"",[230,246,247],{"class":236},": [\n",[230,249,251],{"class":232,"line":250},3,[230,252,253],{"class":236}," {\n",[230,255,257,260,263,267],{"class":232,"line":256},4,[230,258,259],{"class":243}," \"target\"",[230,261,262],{"class":236},": ",[230,264,266],{"class":265},"sJdzJ","\"*yourdomain.com\u002Fassets\u002F*\"",[230,268,269],{"class":236},",\n",[230,271,273,276],{"class":232,"line":272},5,[230,274,275],{"class":243}," \"actions\"",[230,277,247],{"class":236},[230,279,281,284,287,289,292,294,297,299,302],{"class":232,"line":280},6,[230,282,283],{"class":236}," { ",[230,285,286],{"class":243},"\"id\"",[230,288,262],{"class":236},[230,290,291],{"class":265},"\"cache_level\"",[230,293,104],{"class":236},[230,295,296],{"class":243},"\"value\"",[230,298,262],{"class":236},[230,300,301],{"class":265},"\"cache_everything\"",[230,303,304],{"class":236}," },\n",[230,306,308,310,312,314,317,319,321,323,327],{"class":232,"line":307},7,[230,309,283],{"class":236},[230,311,286],{"class":243},[230,313,262],{"class":236},[230,315,316],{"class":265},"\"edge_cache_ttl\"",[230,318,104],{"class":236},[230,320,296],{"class":243},[230,322,262],{"class":236},[230,324,326],{"class":325},"s5hCx","31536000",[230,328,304],{"class":236},[230,330,332,334,336,338,341,343,345,347,349],{"class":232,"line":331},8,[230,333,283],{"class":236},[230,335,286],{"class":243},[230,337,262],{"class":236},[230,339,340],{"class":265},"\"browser_cache_ttl\"",[230,342,104],{"class":236},[230,344,296],{"class":243},[230,346,262],{"class":236},[230,348,326],{"class":325},[230,350,351],{"class":236}," }\n",[230,353,355],{"class":232,"line":354},9,[230,356,357],{"class":236}," ]\n",[230,359,361],{"class":232,"line":360},10,[230,362,304],{"class":236},[230,364,366],{"class":232,"line":365},11,[230,367,253],{"class":236},[230,369,371,373,375,378],{"class":232,"line":370},12,[230,372,259],{"class":243},[230,374,262],{"class":236},[230,376,377],{"class":265},"\"*yourdomain.com\u002Findex.html\"",[230,379,269],{"class":236},[230,381,383,385],{"class":232,"line":382},13,[230,384,275],{"class":243},[230,386,247],{"class":236},[230,388,390,392,394,396,398,400,402,404,407],{"class":232,"line":389},14,[230,391,283],{"class":236},[230,393,286],{"class":243},[230,395,262],{"class":236},[230,397,291],{"class":265},[230,399,104],{"class":236},[230,401,296],{"class":243},[230,403,262],{"class":236},[230,405,406],{"class":265},"\"bypass\"",[230,408,304],{"class":236},[230,410,412,414,416,418,420,422,424,426,429],{"class":232,"line":411},15,[230,413,283],{"class":236},[230,415,286],{"class":243},[230,417,262],{"class":236},[230,419,340],{"class":265},[230,421,104],{"class":236},[230,423,296],{"class":243},[230,425,262],{"class":236},[230,427,428],{"class":325},"0",[230,430,351],{"class":236},[230,432,434],{"class":232,"line":433},16,[230,435,357],{"class":236},[230,437,439],{"class":232,"line":438},17,[230,440,351],{"class":236},[230,442,444],{"class":232,"line":443},18,[230,445,357],{"class":236},[230,447,449],{"class":232,"line":448},19,[230,450,451],{"class":236},"}\n",[14,453,454],{},[455,456,457],"em",{},"Enforces 1-year edge and browser caching for hashed assets while bypassing the cache for the SPA entry point to ensure immediate route updates.",[216,459,461],{"id":460},"vercel-edge-middleware-cache-headers","Vercel Edge Middleware Cache Headers",[221,463,467],{"className":464,"code":465,"language":466,"meta":226,"style":226},"language-javascript shiki shiki-themes github-dark-high-contrast github-dark-high-contrast github-light-high-contrast","import { NextResponse } from 'next\u002Fserver';\n\nexport function middleware(request) {\n const response = NextResponse.next();\n const url = request.nextUrl.pathname;\n\n if (url.startsWith('\u002F_next\u002Fstatic\u002F')) {\n response.headers.set('Cache-Control', 'public, max-age=31536000, immutable');\n } else if (url.endsWith('.json')) {\n response.headers.set('Cache-Control', 'public, max-age=60, stale-while-revalidate=86400');\n }\n\n return response;\n}\n","javascript",[32,468,469,487,493,515,535,547,551,570,591,613,630,634,638,646],{"__ignoreMap":226},[230,470,471,475,478,481,484],{"class":232,"line":233},[230,472,474],{"class":473},"sCJTb","import",[230,476,477],{"class":236}," { NextResponse } ",[230,479,480],{"class":473},"from",[230,482,483],{"class":265}," 'next\u002Fserver'",[230,485,486],{"class":236},";\n",[230,488,489],{"class":232,"line":240},[230,490,492],{"emptyLinePlaceholder":491},true,"\n",[230,494,495,498,501,505,508,512],{"class":232,"line":250},[230,496,497],{"class":473},"export",[230,499,500],{"class":473}," function",[230,502,504],{"class":503},"sGhOu"," middleware",[230,506,507],{"class":236},"(",[230,509,511],{"class":510},"spFnL","request",[230,513,514],{"class":236},") {\n",[230,516,517,520,523,526,529,532],{"class":232,"line":256},[230,518,519],{"class":473}," const",[230,521,522],{"class":325}," response",[230,524,525],{"class":473}," =",[230,527,528],{"class":236}," NextResponse.",[230,530,531],{"class":503},"next",[230,533,534],{"class":236},"();\n",[230,536,537,539,542,544],{"class":232,"line":272},[230,538,519],{"class":473},[230,540,541],{"class":325}," url",[230,543,525],{"class":473},[230,545,546],{"class":236}," request.nextUrl.pathname;\n",[230,548,549],{"class":232,"line":280},[230,550,492],{"emptyLinePlaceholder":491},[230,552,553,556,559,562,564,567],{"class":232,"line":307},[230,554,555],{"class":473}," if",[230,557,558],{"class":236}," (url.",[230,560,561],{"class":503},"startsWith",[230,563,507],{"class":236},[230,565,566],{"class":265},"'\u002F_next\u002Fstatic\u002F'",[230,568,569],{"class":236},")) {\n",[230,571,572,575,578,580,583,585,588],{"class":232,"line":331},[230,573,574],{"class":236}," response.headers.",[230,576,577],{"class":503},"set",[230,579,507],{"class":236},[230,581,582],{"class":265},"'Cache-Control'",[230,584,104],{"class":236},[230,586,587],{"class":265},"'public, max-age=31536000, immutable'",[230,589,590],{"class":236},");\n",[230,592,593,596,599,601,603,606,608,611],{"class":232,"line":354},[230,594,595],{"class":236}," } ",[230,597,598],{"class":473},"else",[230,600,555],{"class":473},[230,602,558],{"class":236},[230,604,605],{"class":503},"endsWith",[230,607,507],{"class":236},[230,609,610],{"class":265},"'.json'",[230,612,569],{"class":236},[230,614,615,617,619,621,623,625,628],{"class":232,"line":360},[230,616,574],{"class":236},[230,618,577],{"class":503},[230,620,507],{"class":236},[230,622,582],{"class":265},[230,624,104],{"class":236},[230,626,627],{"class":265},"'public, max-age=60, stale-while-revalidate=86400'",[230,629,590],{"class":236},[230,631,632],{"class":232,"line":365},[230,633,351],{"class":236},[230,635,636],{"class":232,"line":370},[230,637,492],{"emptyLinePlaceholder":491},[230,639,640,643],{"class":232,"line":382},[230,641,642],{"class":473}," return",[230,644,645],{"class":236}," response;\n",[230,647,648],{"class":232,"line":389},[230,649,451],{"class":236},[14,651,652],{},[455,653,654],{},"Dynamically applies strict immutable caching to Next.js static bundles and aggressive SWR to JSON payloads, optimizing both hit ratio and freshness.",[216,656,658],{"id":657},"aws-cloudfront-cache-policy-configuration","AWS CloudFront Cache Policy Configuration",[221,660,662],{"className":223,"code":661,"language":225,"meta":226,"style":226},"{\n \"CachePolicy\": {\n \"Name\": \"Frontend-Static-Assets\",\n \"ParametersInCacheKeyAndForwardedToOrigin\": {\n \"CookiesConfig\": { \"CookieBehavior\": \"none\" },\n \"HeadersConfig\": { \"HeaderBehavior\": \"none\" },\n \"QueryStringsConfig\": { \"QueryStringBehavior\": \"none\" }\n },\n \"DefaultTTL\": 31536000,\n \"MaxTTL\": 31536000,\n \"MinTTL\": 0\n }\n}\n",[32,663,664,668,676,688,695,713,729,745,749,760,771,781,785],{"__ignoreMap":226},[230,665,666],{"class":232,"line":233},[230,667,237],{"class":236},[230,669,670,673],{"class":232,"line":240},[230,671,672],{"class":243}," \"CachePolicy\"",[230,674,675],{"class":236},": {\n",[230,677,678,681,683,686],{"class":232,"line":250},[230,679,680],{"class":243}," \"Name\"",[230,682,262],{"class":236},[230,684,685],{"class":265},"\"Frontend-Static-Assets\"",[230,687,269],{"class":236},[230,689,690,693],{"class":232,"line":256},[230,691,692],{"class":243}," \"ParametersInCacheKeyAndForwardedToOrigin\"",[230,694,675],{"class":236},[230,696,697,700,703,706,708,711],{"class":232,"line":272},[230,698,699],{"class":243}," \"CookiesConfig\"",[230,701,702],{"class":236},": { ",[230,704,705],{"class":243},"\"CookieBehavior\"",[230,707,262],{"class":236},[230,709,710],{"class":265},"\"none\"",[230,712,304],{"class":236},[230,714,715,718,720,723,725,727],{"class":232,"line":280},[230,716,717],{"class":243}," \"HeadersConfig\"",[230,719,702],{"class":236},[230,721,722],{"class":243},"\"HeaderBehavior\"",[230,724,262],{"class":236},[230,726,710],{"class":265},[230,728,304],{"class":236},[230,730,731,734,736,739,741,743],{"class":232,"line":307},[230,732,733],{"class":243}," \"QueryStringsConfig\"",[230,735,702],{"class":236},[230,737,738],{"class":243},"\"QueryStringBehavior\"",[230,740,262],{"class":236},[230,742,710],{"class":265},[230,744,351],{"class":236},[230,746,747],{"class":232,"line":331},[230,748,304],{"class":236},[230,750,751,754,756,758],{"class":232,"line":354},[230,752,753],{"class":243}," \"DefaultTTL\"",[230,755,262],{"class":236},[230,757,326],{"class":325},[230,759,269],{"class":236},[230,761,762,765,767,769],{"class":232,"line":360},[230,763,764],{"class":243}," \"MaxTTL\"",[230,766,262],{"class":236},[230,768,326],{"class":325},[230,770,269],{"class":236},[230,772,773,776,778],{"class":232,"line":365},[230,774,775],{"class":243}," \"MinTTL\"",[230,777,262],{"class":236},[230,779,780],{"class":325},"0\n",[230,782,783],{"class":232,"line":370},[230,784,351],{"class":236},[230,786,787],{"class":232,"line":382},[230,788,451],{"class":236},[14,790,791],{},[455,792,793],{},"Strips cookies, headers, and query strings from cache keys to maximize hit ratio for versioned frontend assets, enforcing a 1-year TTL.",[24,795,797],{"id":796},"common-mistakes","Common Mistakes",[799,800,801,809,818,824,830],"ul",{},[802,803,804,808],"li",{},[805,806,807],"strong",{},"Setting identical TTLs for hashed and unhashed assets",", causing stale content delivery or unnecessary origin fetches when non-versioned files change.",[802,810,811,817],{},[805,812,813,814,816],{},"Ignoring ",[32,815,89],{}," header fragmentation",", which multiplies cache storage requirements and reduces effective hit ratios across different client configurations.",[802,819,820,823],{},[805,821,822],{},"Overusing cache purge APIs instead of implementing proper asset versioning",", leading to temporary cold-cache latency spikes and increased origin load during deployments.",[802,825,826,829],{},[805,827,828],{},"Failing to normalize query parameters in cache keys",", resulting in duplicate cached responses for identical resources and wasted edge storage.",[802,831,832,835],{},[805,833,834],{},"Neglecting to coordinate edge cache invalidation with service worker updates",", causing version mismatches in production and broken hydration states.",[24,837,839],{"id":838},"faq","FAQ",[14,841,842,845,846,848],{},[805,843,844],{},"What is the optimal cache hit ratio for frontend assets?","\nTarget >85% for static, versioned assets and >60% for dynamic API responses. Ratios below these thresholds indicate cache key fragmentation, misconfigured TTLs, or excessive ",[32,847,89],{}," header usage.",[14,850,851,854,855,39,858,860],{},[805,852,853],{},"Should I use stale-while-revalidate for all frontend routes?","\nNo. Reserve SWR for semi-dynamic payloads (e.g., JSON configs, personalized UI data). Immutable assets should use strict ",[32,856,857],{},"max-age",[32,859,42],{}," directives to prevent unnecessary revalidation requests and conserve bandwidth.",[14,862,863,866,867,104,870,873],{},[805,864,865],{},"How do I prevent CDN cache poisoning via query parameters?","\nConfigure cache key normalization rules at the edge to strip tracking parameters (",[32,868,869],{},"utm_",[32,871,872],{},"fbclid",", etc.) and only retain versioning or locale parameters that genuinely alter the response payload.",[14,875,876,879,880,883],{},[805,877,878],{},"When should I purge the CDN cache versus deploying versioned assets?","\nAlways prefer versioned asset naming (e.g., ",[32,881,882],{},"app.v1.2.3.js",") over manual purges. 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