[{"data":1,"prerenderedAt":2927},["ShallowReactive",2],{"page:\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002Fsecurity-headers-on-vercel-for-static-sites":3,"all-docs-nav":1779,"filed:\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002Fsecurity-headers-on-vercel-for-static-sites":2918},{"id":4,"title":5,"body":6,"breadcrumb":1754,"dateModified":1764,"datePublished":1764,"description":1765,"extension":1766,"faq":1767,"meta":1772,"navigation":1773,"path":1774,"seo":1775,"slug":12,"stem":1776,"type":1777,"__hash__":1778},"content\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002Fsecurity-headers-on-vercel-for-static-sites\u002Findex.md","Security Headers on Vercel for Static Sites",{"type":7,"value":8,"toc":1734},"minimark",[9,13,30,44,49,65,69,295,306,310,322,597,607,760,764,767,887,898,902,905,983,1002,1129,1133,1148,1249,1252,1256,1259,1496,1499,1503,1506,1510,1604,1607,1611,1644,1648,1654,1658,1663,1666,1670,1673,1677,1680,1684,1687,1691,1730],[10,11,5],"h1",{"id":12},"security-headers-on-vercel-for-static-sites",[14,15,16,17,21,22,25,26,29],"p",{},"Vercel takes care of HTTPS: certificates are automatic, HTTP redirects to HTTPS, and ",[18,19,20],"code",{},"Strict-Transport-Security"," is sent on its domains. The rest of a static site's security headers — Content Security Policy, MIME sniffing protection, framing, referrer and permissions policies — are the site's job, configured in the ",[18,23,24],{},"headers"," array of ",[18,27,28],{},"vercel.json",". The configuration is short, with three things to get right: making the rules cover every path, ordering them so path-specific headers override the general ones, and handling preview deployments whose tooling needs a slightly different policy.",[14,31,32,33,38,39,43],{},"This guide adds a full header set to an Eleventy marketing and documentation site deployed to Vercel, with a strict CSP generated at build time, path-specific additions, a relaxed policy only on preview hosts, and a per-deploy test. It belongs to ",[34,35,37],"a",{"href":36},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002F","Security Headers and Hardening for Static Sites","; caching headers on the same platform are covered in ",[34,40,42],{"href":41},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-control-headers-on-vercel-for-static-sites\u002F","Cache-Control Headers on Vercel for Static Sites",".",[45,46,48],"h2",{"id":47},"prerequisites","Prerequisites",[50,51,52,59,62],"ul",{},[53,54,55,56,58],"li",{},"A static site deployed to Vercel with ",[18,57,28],{}," in the repository.",[53,60,61],{},"The list of third-party origins the site uses, and any inline scripts that must remain (with their hashes).",[53,63,64],{},"A preview URL to test against before production.",[45,66,68],{"id":67},"step-1-the-site-wide-headers","Step 1: The Site-Wide Headers",[70,71,76],"pre",{"className":72,"code":73,"language":74,"meta":75,"style":75},"language-json shiki shiki-themes github-light github-dark","{\n  \"headers\": [\n    {\n      \"source\": \"\u002F(.*)\",\n      \"headers\": [\n        { \"key\": \"X-Content-Type-Options\", \"value\": \"nosniff\" },\n        { \"key\": \"Referrer-Policy\", \"value\": \"strict-origin-when-cross-origin\" },\n        { \"key\": \"Permissions-Policy\", \"value\": \"camera=(), microphone=(), geolocation=(), payment=()\" },\n        { \"key\": \"X-Frame-Options\", \"value\": \"DENY\" },\n        { \"key\": \"Cross-Origin-Opener-Policy\", \"value\": \"same-origin\" },\n        { \"key\": \"Strict-Transport-Security\", \"value\": \"max-age=63072000; includeSubDomains\" }\n      ]\n    }\n  ]\n}\n","json","",[18,77,78,87,97,103,119,127,155,178,201,224,247,271,277,283,289],{"__ignoreMap":75},[79,80,83],"span",{"class":81,"line":82},"line",1,[79,84,86],{"class":85},"sVt8B","{\n",[79,88,90,94],{"class":81,"line":89},2,[79,91,93],{"class":92},"sj4cs","  \"headers\"",[79,95,96],{"class":85},": [\n",[79,98,100],{"class":81,"line":99},3,[79,101,102],{"class":85},"    {\n",[79,104,106,109,112,116],{"class":81,"line":105},4,[79,107,108],{"class":92},"      \"source\"",[79,110,111],{"class":85},": ",[79,113,115],{"class":114},"sZZnC","\"\u002F(.*)\"",[79,117,118],{"class":85},",\n",[79,120,122,125],{"class":81,"line":121},5,[79,123,124],{"class":92},"      \"headers\"",[79,126,96],{"class":85},[79,128,130,133,136,138,141,144,147,149,152],{"class":81,"line":129},6,[79,131,132],{"class":85},"        { ",[79,134,135],{"class":92},"\"key\"",[79,137,111],{"class":85},[79,139,140],{"class":114},"\"X-Content-Type-Options\"",[79,142,143],{"class":85},", ",[79,145,146],{"class":92},"\"value\"",[79,148,111],{"class":85},[79,150,151],{"class":114},"\"nosniff\"",[79,153,154],{"class":85}," },\n",[79,156,158,160,162,164,167,169,171,173,176],{"class":81,"line":157},7,[79,159,132],{"class":85},[79,161,135],{"class":92},[79,163,111],{"class":85},[79,165,166],{"class":114},"\"Referrer-Policy\"",[79,168,143],{"class":85},[79,170,146],{"class":92},[79,172,111],{"class":85},[79,174,175],{"class":114},"\"strict-origin-when-cross-origin\"",[79,177,154],{"class":85},[79,179,181,183,185,187,190,192,194,196,199],{"class":81,"line":180},8,[79,182,132],{"class":85},[79,184,135],{"class":92},[79,186,111],{"class":85},[79,188,189],{"class":114},"\"Permissions-Policy\"",[79,191,143],{"class":85},[79,193,146],{"class":92},[79,195,111],{"class":85},[79,197,198],{"class":114},"\"camera=(), microphone=(), geolocation=(), payment=()\"",[79,200,154],{"class":85},[79,202,204,206,208,210,213,215,217,219,222],{"class":81,"line":203},9,[79,205,132],{"class":85},[79,207,135],{"class":92},[79,209,111],{"class":85},[79,211,212],{"class":114},"\"X-Frame-Options\"",[79,214,143],{"class":85},[79,216,146],{"class":92},[79,218,111],{"class":85},[79,220,221],{"class":114},"\"DENY\"",[79,223,154],{"class":85},[79,225,227,229,231,233,236,238,240,242,245],{"class":81,"line":226},10,[79,228,132],{"class":85},[79,230,135],{"class":92},[79,232,111],{"class":85},[79,234,235],{"class":114},"\"Cross-Origin-Opener-Policy\"",[79,237,143],{"class":85},[79,239,146],{"class":92},[79,241,111],{"class":85},[79,243,244],{"class":114},"\"same-origin\"",[79,246,154],{"class":85},[79,248,250,252,254,256,259,261,263,265,268],{"class":81,"line":249},11,[79,251,132],{"class":85},[79,253,135],{"class":92},[79,255,111],{"class":85},[79,257,258],{"class":114},"\"Strict-Transport-Security\"",[79,260,143],{"class":85},[79,262,146],{"class":92},[79,264,111],{"class":85},[79,266,267],{"class":114},"\"max-age=63072000; includeSubDomains\"",[79,269,270],{"class":85}," }\n",[79,272,274],{"class":81,"line":273},12,[79,275,276],{"class":85},"      ]\n",[79,278,280],{"class":81,"line":279},13,[79,281,282],{"class":85},"    }\n",[79,284,286],{"class":81,"line":285},14,[79,287,288],{"class":85},"  ]\n",[79,290,292],{"class":81,"line":291},15,[79,293,294],{"class":85},"}\n",[14,296,297,298,301,302,43],{},"Vercel already sends HSTS, but setting it explicitly documents the intended value and controls ",[18,299,300],{},"includeSubDomains",", which matters for a custom apex domain with other subdomains. Check that every subdomain serves HTTPS before including them, as in ",[34,303,305],{"href":304},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002Fenabling-hsts-and-preload-safely\u002F","Enabling HSTS and Preload Safely",[45,307,309],{"id":308},"step-2-a-csp-generated-at-build-time","Step 2: A CSP Generated at Build Time",[14,311,312,313,315,316,318,319,321],{},"The CSP depends on the build: the hash of the one inline script changes when that script does. Rather than maintain it by hand in ",[18,314,28],{},", the build writes it. A post-build script reads the final HTML, computes hashes of executable inline scripts and patches ",[18,317,28],{},"'s CSP entry before Vercel reads it — Vercel reads ",[18,320,28],{}," after the build command runs, so the patched file applies to the deployment:",[70,323,327],{"className":324,"code":325,"language":326,"meta":75,"style":75},"language-js shiki shiki-themes github-light github-dark","\u002F\u002F scripts\u002Fwrite-csp.mjs (runs at the end of the build command)\nconst hashes = await inlineScriptHashes('_site');   \u002F\u002F as in the CSP violations guide\nconst csp = [\n  \"default-src 'self'\", `script-src 'self' ${hashes.join(' ')} https:\u002F\u002Fplausible.io`,\n  \"style-src 'self'\", \"img-src 'self' data: https:\u002F\u002Fimages.example-cdn.com\", \"font-src 'self'\",\n  \"connect-src 'self' https:\u002F\u002Fplausible.io\", \"frame-ancestors 'none'\", \"base-uri 'self'\",\n  \"form-action 'self' https:\u002F\u002Fforms.example.com\", \"object-src 'none'\", 'upgrade-insecure-requests',\n].join('; ');\nconst cfg = JSON.parse(await fs.readFile('vercel.json', 'utf8'));\ncfg.headers.find((h) => h.source === '\u002F(.*)').headers.push({ key: 'Content-Security-Policy', value: csp });\nawait fs.writeFile('vercel.json', JSON.stringify(cfg, null, 2));\n","js",[18,328,329,335,366,378,409,426,443,460,475,516,561],{"__ignoreMap":75},[79,330,331],{"class":81,"line":82},[79,332,334],{"class":333},"sJ8bj","\u002F\u002F scripts\u002Fwrite-csp.mjs (runs at the end of the build command)\n",[79,336,337,341,344,347,350,354,357,360,363],{"class":81,"line":89},[79,338,340],{"class":339},"szBVR","const",[79,342,343],{"class":92}," hashes",[79,345,346],{"class":339}," =",[79,348,349],{"class":339}," await",[79,351,353],{"class":352},"sScJk"," inlineScriptHashes",[79,355,356],{"class":85},"(",[79,358,359],{"class":114},"'_site'",[79,361,362],{"class":85},");   ",[79,364,365],{"class":333},"\u002F\u002F as in the CSP violations guide\n",[79,367,368,370,373,375],{"class":81,"line":99},[79,369,340],{"class":339},[79,371,372],{"class":92}," csp",[79,374,346],{"class":339},[79,376,377],{"class":85}," [\n",[79,379,380,383,385,388,391,393,396,398,401,404,407],{"class":81,"line":105},[79,381,382],{"class":114},"  \"default-src 'self'\"",[79,384,143],{"class":85},[79,386,387],{"class":114},"`script-src 'self' ${",[79,389,390],{"class":85},"hashes",[79,392,43],{"class":114},[79,394,395],{"class":352},"join",[79,397,356],{"class":114},[79,399,400],{"class":114},"' '",[79,402,403],{"class":114},")",[79,405,406],{"class":114},"} https:\u002F\u002Fplausible.io`",[79,408,118],{"class":85},[79,410,411,414,416,419,421,424],{"class":81,"line":121},[79,412,413],{"class":114},"  \"style-src 'self'\"",[79,415,143],{"class":85},[79,417,418],{"class":114},"\"img-src 'self' data: https:\u002F\u002Fimages.example-cdn.com\"",[79,420,143],{"class":85},[79,422,423],{"class":114},"\"font-src 'self'\"",[79,425,118],{"class":85},[79,427,428,431,433,436,438,441],{"class":81,"line":129},[79,429,430],{"class":114},"  \"connect-src 'self' https:\u002F\u002Fplausible.io\"",[79,432,143],{"class":85},[79,434,435],{"class":114},"\"frame-ancestors 'none'\"",[79,437,143],{"class":85},[79,439,440],{"class":114},"\"base-uri 'self'\"",[79,442,118],{"class":85},[79,444,445,448,450,453,455,458],{"class":81,"line":157},[79,446,447],{"class":114},"  \"form-action 'self' https:\u002F\u002Fforms.example.com\"",[79,449,143],{"class":85},[79,451,452],{"class":114},"\"object-src 'none'\"",[79,454,143],{"class":85},[79,456,457],{"class":114},"'upgrade-insecure-requests'",[79,459,118],{"class":85},[79,461,462,465,467,469,472],{"class":81,"line":180},[79,463,464],{"class":85},"].",[79,466,395],{"class":352},[79,468,356],{"class":85},[79,470,471],{"class":114},"'; '",[79,473,474],{"class":85},");\n",[79,476,477,479,482,484,487,489,492,494,497,500,503,505,508,510,513],{"class":81,"line":203},[79,478,340],{"class":339},[79,480,481],{"class":92}," cfg",[79,483,346],{"class":339},[79,485,486],{"class":92}," JSON",[79,488,43],{"class":85},[79,490,491],{"class":352},"parse",[79,493,356],{"class":85},[79,495,496],{"class":339},"await",[79,498,499],{"class":85}," fs.",[79,501,502],{"class":352},"readFile",[79,504,356],{"class":85},[79,506,507],{"class":114},"'vercel.json'",[79,509,143],{"class":85},[79,511,512],{"class":114},"'utf8'",[79,514,515],{"class":85},"));\n",[79,517,518,521,524,527,531,534,537,540,543,546,549,552,555,558],{"class":81,"line":226},[79,519,520],{"class":85},"cfg.headers.",[79,522,523],{"class":352},"find",[79,525,526],{"class":85},"((",[79,528,530],{"class":529},"s4XuR","h",[79,532,533],{"class":85},") ",[79,535,536],{"class":339},"=>",[79,538,539],{"class":85}," h.source ",[79,541,542],{"class":339},"===",[79,544,545],{"class":114}," '\u002F(.*)'",[79,547,548],{"class":85},").headers.",[79,550,551],{"class":352},"push",[79,553,554],{"class":85},"({ key: ",[79,556,557],{"class":114},"'Content-Security-Policy'",[79,559,560],{"class":85},", value: csp });\n",[79,562,563,565,567,570,572,574,576,579,581,584,587,590,592,595],{"class":81,"line":249},[79,564,496],{"class":339},[79,566,499],{"class":85},[79,568,569],{"class":352},"writeFile",[79,571,356],{"class":85},[79,573,507],{"class":114},[79,575,143],{"class":85},[79,577,578],{"class":92},"JSON",[79,580,43],{"class":85},[79,582,583],{"class":352},"stringify",[79,585,586],{"class":85},"(cfg, ",[79,588,589],{"class":92},"null",[79,591,143],{"class":85},[79,593,594],{"class":92},"2",[79,596,515],{"class":85},[14,598,599,600,602,603,606],{},"The repository's committed ",[18,601,28],{}," has no CSP; the build adds it. A test in CI asserts that the generated hash matches the script in the built HTML, so a later step that changes the HTML would fail the build rather than ship a broken policy. The policy ran as ",[18,604,605],{},"Content-Security-Policy-Report-Only"," for a week before enforcement.",[608,609,610,756],"figure",{},[611,612,619,620,619,624,619,628,619,635,619,741],"svg",{"viewBox":613,"role":614,"ariaLabelledBy":615,"xmlns":618},"0 0 760 154","img",[616,617],"vsec-build-title","vsec-build-desc","http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","\n  ",[621,622,623],"title",{"id":616},"Build steps that generate the CSP header for Vercel",[625,626,627],"desc",{"id":617},"Five steps. Eleventy builds and minifies the HTML. A script computes hashes of executable inline scripts in the final HTML. It writes the Content-Security-Policy into vercel.json's site-wide headers entry. Vercel reads vercel.json after the build and applies the headers to the deployment. A test checks the hash matches the shipped script.",[629,630],"rect",{"x":631,"y":631,"width":632,"height":633,"fill":634},"0","760","154","#ffffff",[636,637,639,640,639,650,639,655,639,662,639,666,639,669,639,675,639,678,639,684,639,687,639,695,639,701,639,706,639,711,639,715,639,719,639,722,639,724,639,727,639,731,639,734,639,738,619],"g",{"style":638},"font-family:system-ui, sans-serif;font-size:12px","\n    ",[629,641],{"x":642,"y":643,"width":644,"height":645,"rx":646,"fill":647,"stroke":648,"style":649},"20.0","64.0","116.8","74.1","8","#f8fafc","#d9e2ef","stroke-width:1.5px",[629,651],{"x":652,"y":643,"width":644,"height":645,"rx":646,"fill":653,"opacity":654,"stroke":653,"style":649},"170.8","#6a4c93","0.14",[656,657],"path",{"d":658,"fill":659,"stroke":660,"style":661},"M138.8 101.1 L166.8 101.1","none","#556071","stroke-width:2px;marker-end:url(#vsec-build-arrow)",[629,663],{"x":664,"y":643,"width":644,"height":645,"rx":646,"fill":665,"opacity":654,"stroke":665,"style":649},"321.6","#1982c4",[656,667],{"d":668,"fill":659,"stroke":660,"style":661},"M289.6 101.1 L317.6 101.1",[629,670],{"x":671,"y":643,"width":644,"height":645,"rx":646,"fill":672,"opacity":673,"stroke":674,"style":649},"472.4","#8ac926","0.2","#5a8a16",[656,676],{"d":677,"fill":659,"stroke":660,"style":661},"M440.4 101.1 L468.4 101.1",[629,679],{"x":680,"y":643,"width":644,"height":645,"rx":646,"fill":681,"opacity":682,"stroke":683,"style":649},"623.2","#ffca3a","0.24","#a97b00",[656,685],{"d":686,"fill":659,"stroke":660,"style":661},"M591.2 101.1 L619.2 101.1",[688,689,694],"text",{"x":690,"y":691,"fill":692,"style":693},"380.0","30.0","#1f2937","font-size:16px;text-anchor:middle;font-weight:700","Where the CSP comes from",[688,696,700],{"x":697,"y":698,"fill":692,"style":699},"78.4","98.8","font-size:13px;text-anchor:middle;font-weight:700","Build + minify",[688,702,705],{"x":697,"y":703,"fill":660,"style":704},"115.7","font-size:11px;text-anchor:middle","Eleventy",[688,707,710],{"x":708,"y":709,"fill":692,"style":699},"229.2","90.4","Hash inline",[688,712,714],{"x":708,"y":713,"fill":692,"style":699},"107.3","scripts",[688,716,718],{"x":708,"y":717,"fill":660,"style":704},"124.2","final HTML",[688,720,721],{"x":690,"y":709,"fill":692,"style":699},"Patch",[688,723,28],{"x":690,"y":713,"fill":692,"style":699},[688,725,726],{"x":690,"y":717,"fill":660,"style":704},"CSP entry",[688,728,730],{"x":729,"y":698,"fill":692,"style":699},"530.8","Vercel applies",[688,732,733],{"x":729,"y":703,"fill":660,"style":704},"to the deployment",[688,735,737],{"x":736,"y":698,"fill":692,"style":699},"681.6","Hash test",[688,739,740],{"x":736,"y":703,"fill":660,"style":704},"in CI",[742,743,639,744,619],"defs",{},[745,746,752,753,639],"marker",{"id":747,"viewBox":748,"refX":646,"refY":749,"markerWidth":750,"markerHeight":750,"orient":751},"vsec-build-arrow","0 0 10 10","5","7","auto-start-reverse","\n      ",[656,754],{"d":755,"fill":660},"M0 0 L10 5 L0 10 z",[757,758,759],"figcaption",{},"The committed vercel.json never contains a stale hash, because the build writes the current one.",[45,761,763],{"id":762},"step-3-path-specific-headers","Step 3: Path-Specific Headers",[14,765,766],{},"Later entries override earlier ones for the same header key, so path-specific entries come after the site-wide one:",[70,768,770],{"className":72,"code":769,"language":74,"meta":75,"style":75},"{ \"source\": \"\u002Fembed\u002F(.*)\",\n  \"headers\": [\n    { \"key\": \"X-Frame-Options\", \"value\": \"SAMEORIGIN\" },\n    { \"key\": \"Content-Security-Policy\", \"value\": \"default-src 'self'; frame-ancestors https:\u002F\u002Fpartner.example.org; base-uri 'self'; object-src 'none'\" }\n  ] },\n{ \"source\": \"\u002Fdownloads\u002F(.*)\\\\.pdf\",\n  \"headers\": [{ \"key\": \"Content-Disposition\", \"value\": \"attachment\" }] }\n",[18,771,772,787,793,815,837,842,861],{"__ignoreMap":75},[79,773,774,777,780,782,785],{"class":81,"line":82},[79,775,776],{"class":85},"{ ",[79,778,779],{"class":92},"\"source\"",[79,781,111],{"class":85},[79,783,784],{"class":114},"\"\u002Fembed\u002F(.*)\"",[79,786,118],{"class":85},[79,788,789,791],{"class":81,"line":89},[79,790,93],{"class":92},[79,792,96],{"class":85},[79,794,795,798,800,802,804,806,808,810,813],{"class":81,"line":99},[79,796,797],{"class":85},"    { ",[79,799,135],{"class":92},[79,801,111],{"class":85},[79,803,212],{"class":114},[79,805,143],{"class":85},[79,807,146],{"class":92},[79,809,111],{"class":85},[79,811,812],{"class":114},"\"SAMEORIGIN\"",[79,814,154],{"class":85},[79,816,817,819,821,823,826,828,830,832,835],{"class":81,"line":105},[79,818,797],{"class":85},[79,820,135],{"class":92},[79,822,111],{"class":85},[79,824,825],{"class":114},"\"Content-Security-Policy\"",[79,827,143],{"class":85},[79,829,146],{"class":92},[79,831,111],{"class":85},[79,833,834],{"class":114},"\"default-src 'self'; frame-ancestors https:\u002F\u002Fpartner.example.org; base-uri 'self'; object-src 'none'\"",[79,836,270],{"class":85},[79,838,839],{"class":81,"line":121},[79,840,841],{"class":85},"  ] },\n",[79,843,844,846,848,850,853,856,859],{"class":81,"line":129},[79,845,776],{"class":85},[79,847,779],{"class":92},[79,849,111],{"class":85},[79,851,852],{"class":114},"\"\u002Fdownloads\u002F(.*)",[79,854,855],{"class":92},"\\\\",[79,857,858],{"class":114},".pdf\"",[79,860,118],{"class":85},[79,862,863,865,868,870,872,875,877,879,881,884],{"class":81,"line":157},[79,864,93],{"class":92},[79,866,867],{"class":85},": [{ ",[79,869,135],{"class":92},[79,871,111],{"class":85},[79,873,874],{"class":114},"\"Content-Disposition\"",[79,876,143],{"class":85},[79,878,146],{"class":92},[79,880,111],{"class":85},[79,882,883],{"class":114},"\"attachment\"",[79,885,886],{"class":85}," }] }\n",[14,888,889,890,893,894,897],{},"The ",[18,891,892],{},"\u002Fembed\u002F"," pages are designed to be framed by one partner site, so they replace the deny-all framing rules with an explicit ",[18,895,896],{},"frame-ancestors"," allowance. PDFs download rather than render inline, which avoids PDF viewers executing embedded scripts from user-supplied documents.",[45,899,901],{"id":900},"step-4-previews","Step 4: Previews",[14,903,904],{},"Vercel's preview toolbar, used by reviewers for comments, loads scripts and frames from Vercel's own origins, which the strict production CSP blocks. A host-conditioned entry, placed last, relaxes the policy only for preview hosts:",[70,906,908],{"className":72,"code":907,"language":74,"meta":75,"style":75},"{ \"source\": \"\u002F(.*)\",\n  \"has\": [{ \"type\": \"host\", \"value\": \"(?\u003Ch>.*-acme\\\\.vercel\\\\.app)\" }],\n  \"headers\": [{ \"key\": \"Content-Security-Policy-Report-Only\", \"value\": \"default-src 'self' https:\u002F\u002Fvercel.live https:\u002F\u002F*.vercel.app; …\" }] }\n",[18,909,910,922,959],{"__ignoreMap":75},[79,911,912,914,916,918,920],{"class":81,"line":82},[79,913,776],{"class":85},[79,915,779],{"class":92},[79,917,111],{"class":85},[79,919,115],{"class":114},[79,921,118],{"class":85},[79,923,924,927,929,932,934,937,939,941,943,946,948,951,953,956],{"class":81,"line":89},[79,925,926],{"class":92},"  \"has\"",[79,928,867],{"class":85},[79,930,931],{"class":92},"\"type\"",[79,933,111],{"class":85},[79,935,936],{"class":114},"\"host\"",[79,938,143],{"class":85},[79,940,146],{"class":92},[79,942,111],{"class":85},[79,944,945],{"class":114},"\"(?\u003Ch>.*-acme",[79,947,855],{"class":92},[79,949,950],{"class":114},".vercel",[79,952,855],{"class":92},[79,954,955],{"class":114},".app)\"",[79,957,958],{"class":85}," }],\n",[79,960,961,963,965,967,969,972,974,976,978,981],{"class":81,"line":99},[79,962,93],{"class":92},[79,964,867],{"class":85},[79,966,135],{"class":92},[79,968,111],{"class":85},[79,970,971],{"class":114},"\"Content-Security-Policy-Report-Only\"",[79,973,143],{"class":85},[79,975,146],{"class":92},[79,977,111],{"class":85},[79,979,980],{"class":114},"\"default-src 'self' https:\u002F\u002Fvercel.live https:\u002F\u002F*.vercel.app; …\"",[79,982,886],{"class":85},[14,984,985,986,989,990,994,995,998,999,43],{},"On preview hosts, the build script writes the strict policy as ",[18,987,988],{},"Report-Only"," instead of enforced — reports from previews still reveal real problems before they reach production, while the toolbar works. Production on the custom domain gets the enforced policy. ",[34,991,993],{"href":992},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fpreview-environments-for-pull-requests\u002Ffixing-preview-deploys-leaking-into-search-results\u002F","Fixing Preview Deploys Leaking Into Search Results"," uses the same ",[18,996,997],{},"has"," mechanism for ",[18,1000,1001],{},"noindex",[608,1003,1004,1126],{},[611,1005,619,1010,619,1013,619,1016,619,1019],{"viewBox":1006,"role":614,"ariaLabelledBy":1007,"xmlns":618},"0 0 760 252",[1008,1009],"vsec-hosts-title","vsec-hosts-desc",[621,1011,1012],{"id":1008},"Security header behaviour on production and preview hosts",[625,1014,1015],{"id":1009},"A matrix of two hosts against four headers. On the production custom domain, CSP is enforced, framing is denied, HSTS is set and nosniff is set. On preview hosts, CSP is report-only with Vercel toolbar origins allowed, framing is denied, HSTS is set by Vercel, and nosniff is set.",[629,1017],{"x":631,"y":631,"width":632,"height":1018,"fill":634},"252",[636,1020,639,1021,639,1024,639,1031,639,1034,639,1037,639,1040,639,1042,639,1045,639,1049,639,1051,639,1054,639,1057,639,1059,639,1062,639,1065,639,1070,639,1075,639,1079,639,1083,639,1088,639,1091,639,1095,639,1099,639,1101,639,1105,639,1109,639,1113,639,1116,639,1120,639,1124,619],{"style":638},[656,1022],{"d":1023,"fill":659,"stroke":660,"style":649},"M20.0 86.0 L740.0 86.0",[629,1025],{"x":1026,"y":1027,"width":1028,"height":1029,"rx":749,"fill":672,"opacity":673,"stroke":674,"style":1030},"214.0","90.0","257.0","25.6","stroke-width:1px",[629,1032],{"x":1033,"y":1027,"width":1028,"height":1029,"rx":749,"fill":681,"opacity":682,"stroke":683,"style":1030},"479.0",[656,1035],{"d":1036,"fill":659,"stroke":648,"style":1030},"M20.0 119.6 L740.0 119.6",[629,1038],{"x":1026,"y":1039,"width":1028,"height":1029,"rx":749,"fill":672,"opacity":673,"stroke":674,"style":1030},"123.6",[629,1041],{"x":1033,"y":1039,"width":1028,"height":1029,"rx":749,"fill":672,"opacity":673,"stroke":674,"style":1030},[656,1043],{"d":1044,"fill":659,"stroke":648,"style":1030},"M20.0 153.2 L740.0 153.2",[629,1046],{"x":1026,"y":1047,"width":1028,"height":1048,"rx":749,"fill":672,"opacity":673,"stroke":674,"style":1030},"157.2","41.2",[629,1050],{"x":1033,"y":1047,"width":1028,"height":1048,"rx":749,"fill":665,"opacity":654,"stroke":665,"style":1030},[656,1052],{"d":1053,"fill":659,"stroke":648,"style":1030},"M20.0 202.4 L740.0 202.4",[629,1055],{"x":1026,"y":1056,"width":1028,"height":1029,"rx":749,"fill":672,"opacity":673,"stroke":674,"style":1030},"206.4",[629,1058],{"x":1033,"y":1056,"width":1028,"height":1029,"rx":749,"fill":672,"opacity":673,"stroke":674,"style":1030},[656,1060],{"d":1061,"fill":659,"stroke":648,"style":1030},"M20.0 236.0 L740.0 236.0",[688,1063,1064],{"x":690,"y":691,"fill":692,"style":693},"Policy by host",[688,1066,1069],{"x":691,"y":1067,"fill":692,"style":1068},"75.2","font-size:12px;text-anchor:start;font-weight:700","Header",[688,1071,1074],{"x":1072,"y":1067,"fill":692,"style":1073},"342.5","font-size:12px;text-anchor:middle;font-weight:700","Production domain",[688,1076,1078],{"x":1077,"y":1067,"fill":692,"style":1073},"607.5","Preview hosts",[688,1080,1082],{"x":691,"y":1081,"fill":692,"style":1068},"106.4","Content-Security-Policy",[688,1084,1087],{"x":1072,"y":1085,"fill":692,"style":1086},"106.2","font-size:11.5px;text-anchor:middle","enforced",[688,1089,1090],{"x":1077,"y":1085,"fill":692,"style":1086},"report-only + toolbar",[688,1092,1094],{"x":691,"y":1093,"fill":692,"style":1068},"140.0","X-Frame-Options",[688,1096,1098],{"x":1072,"y":1097,"fill":692,"style":1086},"139.8","DENY",[688,1100,1098],{"x":1077,"y":1097,"fill":692,"style":1086},[688,1102,1104],{"x":691,"y":1103,"fill":692,"style":1068},"173.6","Strict-Transport-",[688,1106,1108],{"x":691,"y":1107,"fill":692,"style":1068},"189.2","Security",[688,1110,1112],{"x":1072,"y":1111,"fill":692,"style":1086},"181.2","2 years, subdomains",[688,1114,1115],{"x":1077,"y":1111,"fill":692,"style":1086},"Vercel default",[688,1117,1119],{"x":691,"y":1118,"fill":692,"style":1068},"222.8","X-Content-Type-Options",[688,1121,1123],{"x":1072,"y":1122,"fill":692,"style":1086},"222.6","nosniff",[688,1125,1123],{"x":1077,"y":1122,"fill":692,"style":1086},[757,1127,1128],{},"Previews still report CSP problems; only enforcement is relaxed so review tools work.",[45,1130,1132],{"id":1131},"collecting-csp-reports-on-a-static-deployment","Collecting CSP Reports on a Static Deployment",[14,1134,1135,1136,1139,1140,1143,1144,1147],{},"A static site has no server to receive CSP reports, so the reporting endpoint is the one small function on the project — a Vercel Function at ",[18,1137,1138],{},"\u002Fapi\u002Fcsp-report"," that validates the payload's shape, drops reports from browser extensions, and forwards the rest to the team's logging service. It handles both the older ",[18,1141,1142],{},"report-uri"," format and the Reporting API's ",[18,1145,1146],{},"report-to"," format, which browsers send with different content types.",[608,1149,1150,1246],{},[611,1151,619,1156,619,1159,619,1162,619,1165],{"viewBox":1152,"role":614,"ariaLabelledBy":1153,"xmlns":618},"0 0 760 295",[1154,1155],"vsec-reports-title","vsec-reports-desc",[621,1157,1158],{"id":1154},"Daily CSP reports from site code during the report-only week",[625,1160,1161],{"id":1155},"Vertical bars of daily reports from site code. Day 1, 2,100 reports. Day 2, 1,900. Day 3 after moving the analytics snippet to a script tag, 640. Day 5 after removing onclick attributes, 90. Day 7 after hashing the theme script, 0.",[629,1163],{"x":631,"y":631,"width":632,"height":1164,"fill":634},"295",[636,1166,639,1167,639,1177,639,1182,639,1188,639,1193,639,1199,639,1202,639,1205,639,1211,639,1215,639,1220,639,1223,639,1227,639,1230,639,1235,639,1238,639,1243,619],{"style":638},[629,1168],{"x":1169,"y":1170,"width":1171,"height":1172,"rx":1173,"fill":1174,"opacity":1175,"stroke":1176,"style":1030},"67.2","76.0","81.6","170.0","3","#ff595e","0.3","#d83b41",[629,1178],{"x":1179,"y":1180,"width":1171,"height":1181,"rx":1173,"fill":1174,"opacity":1175,"stroke":1176,"style":1030},"203.2","92.2","153.8",[629,1183],{"x":1184,"y":1185,"width":1171,"height":1186,"rx":1173,"fill":681,"opacity":1187,"stroke":683,"style":1030},"339.2","194.2","51.8","0.45",[629,1189],{"x":1190,"y":1191,"width":1171,"height":1192,"rx":1173,"fill":681,"opacity":1187,"stroke":683,"style":1030},"475.2","238.7","7.3",[629,1194],{"x":1195,"y":1196,"width":1171,"height":1197,"rx":1173,"fill":672,"opacity":1198,"stroke":674,"style":1030},"611.2","243.0","3.0","0.4",[656,1200],{"d":1201,"fill":659,"stroke":660,"style":649},"M30.0 246.0 L730.0 246.0",[688,1203,1204],{"x":690,"y":691,"fill":692,"style":693},"CSP reports during the report-only week",[688,1206,1210],{"x":1207,"y":1208,"fill":1209,"style":1073},"108.0","69.0","#b32b30","2100",[688,1212,1214],{"x":1207,"y":1213,"fill":660,"style":1086},"264.0","Day 1",[688,1216,1219],{"x":1217,"y":1218,"fill":1209,"style":1073},"244.0","85.2","1900",[688,1221,1222],{"x":1217,"y":1213,"fill":660,"style":1086},"Day 2",[688,1224,1226],{"x":690,"y":1225,"fill":692,"style":1073},"187.2","640",[688,1228,1229],{"x":690,"y":1213,"fill":660,"style":1086},"Day 3",[688,1231,1234],{"x":1232,"y":1233,"fill":692,"style":1073},"516.0","231.7","90",[688,1236,1237],{"x":1232,"y":1213,"fill":660,"style":1086},"Day 5",[688,1239,631],{"x":1240,"y":1241,"fill":1242,"style":1073},"652.0","236.0","#3f6410",[688,1244,1245],{"x":1240,"y":1213,"fill":660,"style":1086},"Day 7",[757,1247,1248],{},"Reports after filtering out browser extensions; enforcement started after two clean days.",[14,1250,1251],{},"The function is the only server code in the deployment, and it is rate-limited at the edge to protect the logging service from report floods, which a single misbehaving extension can produce.",[45,1253,1255],{"id":1254},"step-5-test-every-deploy","Step 5: Test Every Deploy",[14,1257,1258],{},"A check runs against each preview and against production after deploy:",[70,1260,1264],{"className":1261,"code":1262,"language":1263,"meta":75,"style":75},"language-sh shiki shiki-themes github-light github-dark","for u in \u002F \u002Fdocs\u002Finstall\u002F \u002Fassets\u002Fmain.css \u002Fembed\u002Fwidget\u002F \u002Fnope\u002F; do\n  h=$(curl -sI \"$BASE$u\")\n  for k in content-security-policy x-content-type-options referrer-policy strict-transport-security; do\n    echo \"$h\" | grep -qi \"^$k:\" || { echo \"missing $k on $u\"; fail=1; }\n  done\ndone\n[ \"$BASE\" = \"https:\u002F\u002Fexample.com\" ] && curl -sI \"$BASE\u002F\" | grep -qi '^content-security-policy-report-only' && { echo \"prod is report-only\"; fail=1; }\nexit ${fail:-0}\n","sh",[18,1265,1266,1298,1327,1353,1416,1421,1426,1482],{"__ignoreMap":75},[79,1267,1268,1271,1274,1277,1280,1283,1286,1289,1292,1295],{"class":81,"line":82},[79,1269,1270],{"class":339},"for",[79,1272,1273],{"class":85}," u ",[79,1275,1276],{"class":339},"in",[79,1278,1279],{"class":114}," \u002F",[79,1281,1282],{"class":114}," \u002Fdocs\u002Finstall\u002F",[79,1284,1285],{"class":114}," \u002Fassets\u002Fmain.css",[79,1287,1288],{"class":114}," \u002Fembed\u002Fwidget\u002F",[79,1290,1291],{"class":114}," \u002Fnope\u002F",[79,1293,1294],{"class":85},"; ",[79,1296,1297],{"class":339},"do\n",[79,1299,1300,1303,1306,1309,1312,1315,1318,1321,1324],{"class":81,"line":89},[79,1301,1302],{"class":85},"  h",[79,1304,1305],{"class":339},"=",[79,1307,1308],{"class":85},"$(",[79,1310,1311],{"class":352},"curl",[79,1313,1314],{"class":92}," -sI",[79,1316,1317],{"class":114}," \"",[79,1319,1320],{"class":85},"$BASE$u",[79,1322,1323],{"class":114},"\"",[79,1325,1326],{"class":85},")\n",[79,1328,1329,1332,1335,1337,1340,1343,1346,1349,1351],{"class":81,"line":99},[79,1330,1331],{"class":339},"  for",[79,1333,1334],{"class":85}," k ",[79,1336,1276],{"class":339},[79,1338,1339],{"class":114}," content-security-policy",[79,1341,1342],{"class":114}," x-content-type-options",[79,1344,1345],{"class":114}," referrer-policy",[79,1347,1348],{"class":114}," strict-transport-security",[79,1350,1294],{"class":85},[79,1352,1297],{"class":339},[79,1354,1355,1358,1360,1363,1365,1368,1371,1374,1377,1380,1383,1386,1389,1392,1395,1397,1400,1403,1405,1408,1410,1413],{"class":81,"line":105},[79,1356,1357],{"class":92},"    echo",[79,1359,1317],{"class":114},[79,1361,1362],{"class":85},"$h",[79,1364,1323],{"class":114},[79,1366,1367],{"class":339}," |",[79,1369,1370],{"class":352}," grep",[79,1372,1373],{"class":92}," -qi",[79,1375,1376],{"class":114}," \"^",[79,1378,1379],{"class":85},"$k",[79,1381,1382],{"class":114},":\"",[79,1384,1385],{"class":339}," ||",[79,1387,1388],{"class":85}," { ",[79,1390,1391],{"class":92},"echo",[79,1393,1394],{"class":114}," \"missing ",[79,1396,1379],{"class":85},[79,1398,1399],{"class":114}," on ",[79,1401,1402],{"class":85},"$u",[79,1404,1323],{"class":114},[79,1406,1407],{"class":85},"; fail",[79,1409,1305],{"class":339},[79,1411,1412],{"class":114},"1",[79,1414,1415],{"class":85},"; }\n",[79,1417,1418],{"class":81,"line":121},[79,1419,1420],{"class":339},"  done\n",[79,1422,1423],{"class":81,"line":129},[79,1424,1425],{"class":339},"done\n",[79,1427,1428,1431,1433,1436,1438,1440,1443,1446,1448,1450,1452,1454,1457,1459,1461,1463,1466,1469,1471,1474,1476,1478,1480],{"class":81,"line":157},[79,1429,1430],{"class":85},"[ ",[79,1432,1323],{"class":114},[79,1434,1435],{"class":85},"$BASE",[79,1437,1323],{"class":114},[79,1439,346],{"class":339},[79,1441,1442],{"class":114}," \"https:\u002F\u002Fexample.com\"",[79,1444,1445],{"class":85}," ] && ",[79,1447,1311],{"class":352},[79,1449,1314],{"class":92},[79,1451,1317],{"class":114},[79,1453,1435],{"class":85},[79,1455,1456],{"class":114},"\u002F\"",[79,1458,1367],{"class":339},[79,1460,1370],{"class":352},[79,1462,1373],{"class":92},[79,1464,1465],{"class":114}," '^content-security-policy-report-only'",[79,1467,1468],{"class":85}," && { ",[79,1470,1391],{"class":92},[79,1472,1473],{"class":114}," \"prod is report-only\"",[79,1475,1407],{"class":85},[79,1477,1305],{"class":339},[79,1479,1412],{"class":114},[79,1481,1415],{"class":85},[79,1483,1484,1487,1490,1493],{"class":81,"line":180},[79,1485,1486],{"class":92},"exit",[79,1488,1489],{"class":85}," ${fail",[79,1491,1492],{"class":339},":-",[79,1494,1495],{"class":85},"0}\n",[14,1497,1498],{},"The last line guards against the preview relaxation ever matching production.",[45,1500,1502],{"id":1501},"when-headers-need-to-change","When Headers Need to Change",[14,1504,1505],{},"Most header changes come from adding a third-party service — a new video embed, a form provider, an analytics tool. The team's process: the pull request that adds the service also adds its origins to the CSP generator's allow-lists, and the preview's report-only policy shows within minutes whether anything was missed. Reviewers check that each new origin is as narrow as possible (a specific hostname rather than a wildcard) and has a comment naming the feature that needs it, so the list can be pruned when features are removed.",[45,1507,1509],{"id":1508},"measured-impact","Measured Impact",[1511,1512,1513,1532],"table",{},[1514,1515,1516],"thead",{},[1517,1518,1519,1523,1526,1529],"tr",{},[1520,1521,1522],"th",{},"Measure",[1520,1524,1525],{},"Before",[1520,1527,1528],{},"After",[1520,1530,1531],{},"Tool",[1533,1534,1535,1550,1564,1578,1591],"tbody",{},[1517,1536,1537,1541,1544,1547],{},[1538,1539,1540],"td",{},"Mozilla Observatory grade",[1538,1542,1543],{},"C (HSTS only)",[1538,1545,1546],{},"A+",[1538,1548,1549],{},"Observatory",[1517,1551,1552,1555,1558,1561],{},[1538,1553,1554],{},"Security headers on 404 page",[1538,1556,1557],{},"HSTS only",[1538,1559,1560],{},"Full set",[1538,1562,1563],{},"Header test",[1517,1565,1566,1569,1572,1575],{},[1538,1567,1568],{},"CSP violations from site code (enforced)",[1538,1570,1571],{},"—",[1538,1573,1574],{},"0 in 4 weeks",[1538,1576,1577],{},"Report endpoint",[1517,1579,1580,1583,1585,1588],{},[1538,1581,1582],{},"Preview toolbar working",[1538,1584,1571],{},[1538,1586,1587],{},"Yes (report-only on previews)",[1538,1589,1590],{},"Manual",[1517,1592,1593,1596,1598,1601],{},[1538,1594,1595],{},"Manual CSP hash updates",[1538,1597,1571],{},[1538,1599,1600],{},"0 (generated)",[1538,1602,1603],{},"Repository history",[14,1605,1606],{},"The header test now runs nightly against production as well, so a change made outside the repository is caught within a day.",[45,1608,1610],{"id":1609},"pitfalls-rollback","Pitfalls & Rollback",[50,1612,1613,1620,1626,1632,1638],{},[53,1614,1615,1619],{},[1616,1617,1618],"strong",{},"Path-specific entries before the site-wide one."," Later entries win; order matters.",[53,1621,1622,1625],{},[1616,1623,1624],{},"Hand-maintained hashes."," Generate them in the build from the final HTML.",[53,1627,1628,1631],{},[1616,1629,1630],{},"Breaking preview tooling with a strict CSP."," Relax only on preview hosts, in report-only mode.",[53,1633,1634,1637],{},[1616,1635,1636],{},"Relying on headers on redirect responses."," Test redirects separately.",[53,1639,1640,1643],{},[1616,1641,1642],{},"Rollback:"," headers deploy with the site; Vercel's instant rollback restores the previous deployment's headers along with its files.",[45,1645,1647],{"id":1646},"conclusion","Conclusion",[14,1649,1650,1651,1653],{},"On Vercel, HTTPS and HSTS are handled for you and everything else goes in ",[18,1652,28],{},". A site-wide header entry, a CSP generated from the built HTML with the exact inline-script hash, path-specific overrides placed after it, report-only enforcement on preview hosts and a header test on every deploy took this site from a C to an A+ without any hand-maintained hashes.",[45,1655,1657],{"id":1656},"faq","FAQ",[1659,1660,1662],"h3",{"id":1661},"does-vercel-add-security-headers-automatically","Does Vercel add security headers automatically?",[14,1664,1665],{},"Vercel enforces HTTPS and sends a Strict-Transport-Security header on its own domains and custom domains, but it does not add a Content-Security-Policy, X-Content-Type-Options, Referrer-Policy or Permissions-Policy for static sites. Those are configured in the headers array of vercel.json.",[1659,1667,1669],{"id":1668},"how-do-i-apply-headers-to-every-path-in-verceljson","How do I apply headers to every path in vercel.json?",[14,1671,1672],{},"Use a source pattern that matches every path, such as slash, open parenthesis, dot star, close parenthesis, in a headers entry. Entries are applied in order and more than one can match a request; a later entry setting the same header key replaces the earlier value for that request.",[1659,1674,1676],{"id":1675},"do-verceljson-headers-apply-to-the-404-page-and-redirects","Do vercel.json headers apply to the 404 page and redirects?",[14,1678,1679],{},"Headers apply to responses served from the deployment, including the custom 404 page. Redirect responses defined in vercel.json are issued before headers are applied in some cases, so check redirects separately with curl and do not rely on security headers on 3xx responses.",[1659,1681,1683],{"id":1682},"should-preview-deployments-have-the-same-csp-as-production","Should preview deployments have the same CSP as production?",[14,1685,1686],{},"Mostly yes, so that previews catch CSP problems before production. The exception is anything that breaks Vercel's preview tooling, such as the toolbar used for comments, which needs its own origins allowed. A host-conditioned header entry can relax the policy on preview hosts only.",[45,1688,1690],{"id":1689},"related","Related",[50,1692,1693,1702,1709,1716,1723],{},[53,1694,1695,1698,1699,1701],{},[1616,1696,1697],{},"Parent:"," ",[34,1700,37],{"href":36}," — hardening a static site.",[53,1703,1704,1708],{},[34,1705,1707],{"href":1706},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002Fwriting-a-content-security-policy-for-a-static-site\u002F","Writing a Content Security Policy for a Static Site"," — designing the policy.",[53,1710,1711,1715],{},[34,1712,1714],{"href":1713},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002Ffixing-content-security-policy-violations-from-inline-scripts\u002F","Fixing Content Security Policy Violations From Inline Scripts"," — the hashing approach used here.",[53,1717,1718,1722],{},[34,1719,1721],{"href":1720},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fsecurity-headers-for-static-sites\u002Fsecurity-headers-for-static-sites-served-by-caddy\u002F","Security Headers for Static Sites Served by Caddy"," — the same headers on a self-hosted server.",[53,1724,1725,1729],{},[34,1726,1728],{"href":1727},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fnetlify-vs-vercel-deployment-strategies\u002Fdeploying-astro-to-vercel-as-a-fully-static-site\u002F","Deploying Astro to Vercel as a Fully Static Site"," — static deploys on Vercel.",[1731,1732,1733],"style",{},"html pre.shiki code .sVt8B, html code.shiki .sVt8B{--shiki-default:#24292E;--shiki-dark:#E1E4E8}html pre.shiki code .sj4cs, html code.shiki .sj4cs{--shiki-default:#005CC5;--shiki-dark:#79B8FF}html pre.shiki code .sZZnC, html code.shiki .sZZnC{--shiki-default:#032F62;--shiki-dark:#9ECBFF}html .default .shiki span {color: var(--shiki-default);background: 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.szBVR{--shiki-default:#D73A49;--shiki-dark:#F97583}html pre.shiki code .sScJk, html code.shiki .sScJk{--shiki-default:#6F42C1;--shiki-dark:#B392F0}html pre.shiki code .s4XuR, html code.shiki .s4XuR{--shiki-default:#E36209;--shiki-dark:#FFAB70}",{"title":75,"searchDepth":89,"depth":89,"links":1735},[1736,1737,1738,1739,1740,1741,1742,1743,1744,1745,1746,1747,1753],{"id":47,"depth":89,"text":48},{"id":67,"depth":89,"text":68},{"id":308,"depth":89,"text":309},{"id":762,"depth":89,"text":763},{"id":900,"depth":89,"text":901},{"id":1131,"depth":89,"text":1132},{"id":1254,"depth":89,"text":1255},{"id":1501,"depth":89,"text":1502},{"id":1508,"depth":89,"text":1509},{"id":1609,"depth":89,"text":1610},{"id":1646,"depth":89,"text":1647},{"id":1656,"depth":89,"text":1657,"children":1748},[1749,1750,1751,1752],{"id":1661,"depth":99,"text":1662},{"id":1668,"depth":99,"text":1669},{"id":1675,"depth":99,"text":1676},{"id":1682,"depth":99,"text":1683},{"id":1689,"depth":89,"text":1690},[1755,1758,1761,1762],{"name":1756,"item":1757},"Home","\u002F",{"name":1759,"item":1760},"Production-Ready Deployment & CI\u002FCD for 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Astro",{"path":2165,"title":2166},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Fgenerating-sitemaps-for-large-static-sites","Generating Sitemaps for Large Static Sites",{"path":2168,"title":2169},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites","Technical SEO for Static Sites",{"path":2171,"title":2172},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Frobots-txt-and-noindex-for-preview-and-staging","robots.txt and noindex for Preview and Staging",{"path":2174,"title":2175},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Frss-and-atom-feeds-for-static-blogs","RSS and Atom Feeds for Static Blogs",{"path":2177,"title":2178},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Fseo-safe-pagination-and-tag-pages","SEO-Safe 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CloudFront",{"path":2189,"title":42},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-control-headers-on-vercel-for-static-sites",{"path":2191,"title":2192},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-keys-and-query-strings-on-cdns","Cache Keys and Query Strings on CDNs",{"path":2194,"title":2195},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcaching-404s-and-redirects-at-the-edge","Caching 404s and Redirects at the Edge",{"path":2197,"title":2198},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcloudflare-vs-cloudfront-cache-hit-ratios-for-static-sites","Cloudflare vs CloudFront Cache Hit Ratios for Static Sites",{"path":2200,"title":2201},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Ffixing-stale-html-after-deploys-on-cloudflare","Fixing Stale HTML After Deploys on Cloudflare",{"path":2203,"title":2204},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs","CDN Caching Rules for SSGs",{"path":2206,"title":2207},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fpurging-the-cdn-cache-after-a-static-deploy","Purging the CDN Cache After a Static Deploy",{"path":2209,"title":2210},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fsetting-cache-control-headers-on-cloudflare-pages","Cache-Control Headers on Cloudflare Pages",{"path":2212,"title":2213},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fsetting-up-proper-cache-headers-on-netlify","Proper Cache Headers on Netlify for SSGs",{"path":2215,"title":2216},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fstale-while-revalidate-for-static-html","Stale-While-Revalidate for Static HTML",{"path":2218,"title":2219},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Ftiered-caching-and-origin-shield","Tiered Caching and Origin Shield",{"path":2221,"title":2222},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fcode-splitting-and-module-preload-in-vite-based-ssgs","Code Splitting and Module Preload in Vite-Based SSGs",{"path":2224,"title":2225},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ffixing-missing-tailwind-classes-in-production-builds","Fixing Missing Tailwind Classes in Production Builds",{"path":2227,"title":2228},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ffixing-unused-javascript-warnings-on-static-pages","Fixing Unused JavaScript Warnings on Static Pages",{"path":2230,"title":2231},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization","CSS and JavaScript Asset Optimization",{"path":2233,"title":2234},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Finlining-critical-css-on-static-sites","Inlining Critical CSS on Static Sites",{"path":2236,"title":2237},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fkeeping-tailwind-css-output-small-on-static-sites","Keeping Tailwind CSS Output Small on Static Sites",{"path":2239,"title":2240},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fminifying-html-css-and-js-in-eleventy","Minifying HTML, CSS and JS in Eleventy",{"path":2242,"title":2243},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fprecompressing-assets-with-brotli-and-zstd","Precompressing Assets with Brotli and Zstd",{"path":2245,"title":2246},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fpurging-unused-css-with-tailwind-and-lightningcss","Purging Unused CSS with Tailwind and Lightning CSS",{"path":2248,"title":2249},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fsvg-icon-sprites-vs-inline-icons","SVG Icon Sprites vs Inline Icons",{"path":2251,"title":2252},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ftailwind-v4-in-astro-without-postcss-plugins","Tailwind v4 in Astro Without PostCSS Plugins",{"path":2254,"title":2255},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fcls-from-client-side-rendered-components","CLS from Client-Side Rendered Components",{"path":2257,"title":2258},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fdebugging-cls-with-the-layout-instability-api","Debugging CLS with the Layout Instability API",{"path":2260,"title":2261},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Feliminating-layout-shift-from-web-fonts","Eliminating Layout Shift From Web 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Embeds",{"path":2275,"title":2276},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-sticky-headers-and-anchor-links","Fixing CLS from Sticky Headers and Anchor Links",{"path":2278,"title":2279},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites","Cumulative Layout Shift Fixes for Static Sites",{"path":2281,"title":2282},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fmeasuring-cls-in-the-field-with-web-vitals-js","Measuring CLS in the Field With web-vitals.js",{"path":2284,"title":2285},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Freserving-space-for-ad-and-promo-slots","Reserving Space for Ad and Promo Slots",{"path":2287,"title":2288},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Freserving-space-for-images-and-embeds-to-stop-layout-shift","Reserving Space for Images and Embeds",{"path":2290,"title":2291},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fauditing-font-payload-per-page","Auditing Font Payload per Page",{"path":2293,"title":2294},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Ffixing-invisible-text-while-web-fonts-load","Fixing Invisible Text While Web Fonts Load",{"path":2296,"title":2297},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Ffont-display-optional-vs-swap","font-display: optional vs 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