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It is not a firewall. It is not server-side authentication. It is the browser deciding, on the user's behalf, whether to expose a cross-origin response to the page that asked for it.","status":"active","vx_hash":"5dbe8992e254ec782e81b5e198da31d9a714773652f2018ba1ccf7746240e9e8","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"462a47971e3d021bb53bace0ecadb1a1f540d06c43ded3164a82522a735be169","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"757087276a84183f6c37bddd110c04e1c72bc4c7674d26b2cc23cc260074218c","detail":{"divided_from":"body","block":2,"kind":"p"},"prev":"genesis","hash":"462a47971e3d021bb53bace0ecadb1a1f540d06c43ded3164a82522a735be169"}],"claim_ids":["c1"],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d2"},{"id":"d3","kind":"h","type":null,"order":3,"text":"## What It Is","status":"active","vx_hash":"22a28890afd9dd14432a4e2792edf9625cd9f05933ea8c30b587bbc57567c80a","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6bbac3081b28301c297af9c0c3b0ab55dd56ee92c87be8480216f6639d905b42","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"7cc9b58b0dfb719bbb7e29457f0e06e95d6edd4cfa4d0e009fbafd53ca7f4dcf","detail":{"divided_from":"body","block":3,"kind":"h"},"prev":"genesis","hash":"6bbac3081b28301c297af9c0c3b0ab55dd56ee92c87be8480216f6639d905b42"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d3"},{"id":"d4","kind":"p","type":null,"order":4,"text":"**CORS is a browser-enforced access-control protocol. A web server declares, via HTTP headers, which origins may read its responses. The browser reads those headers and either hands the response to the requesting page or blocks it with a network error.** Every cross-origin request the browser makes — `fetch`, `XMLHttpRequest`, `WebSocket`, fonts, images in canvas — is subject to this gate unless the request qualifies as a \"simple\" request that the server has already allowed.","status":"active","vx_hash":"5506799c40b200ce4e056b87f932ecd28f208f6ba581a1a42320c113a9d8098f","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"9df3aaf0c318b223fffb2b040ee9c3da680deccb404708f7072d7a9cb81cea83","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"92f7e8ed0b8e508c1428214cca277c0ccf368e1bff3daf0ea8c6ac9b3f637a55","detail":{"divided_from":"body","block":4,"kind":"p"},"prev":"genesis","hash":"9df3aaf0c318b223fffb2b040ee9c3da680deccb404708f7072d7a9cb81cea83"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d4"},{"id":"d5","kind":"h","type":null,"order":5,"text":"## Why It Matters","status":"active","vx_hash":"eb89b887694caad04fe13ed3989008115241670dbaf36b2fc60afbd3ebaf4c4a","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"97a6eb472e57485081199450d2c0bf319570ea40bca91be0b25f8b35031c38d0","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"a4fa37f6007aebb1ca3f8598714390d729b67c76a7be5e38b2a60424c0e63bb4","detail":{"divided_from":"body","block":5,"kind":"h"},"prev":"genesis","hash":"97a6eb472e57485081199450d2c0bf319570ea40bca91be0b25f8b35031c38d0"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d5"},{"id":"d6","kind":"p","type":null,"order":6,"text":"The web runs on the same-origin policy: a script from `bank.com` cannot read responses from `evil.com`. This is the foundation of web security. Without it, any malicious page you open could read your bank data, steal your session cookies, and act on your behalf.","status":"active","vx_hash":"7341262affcc334d769e69e35027144e7a36b02360960b5cc95bb6360ed6d0ec","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"fa37412b8705028de58e345eea878f789c25794febcb7ced100e8d87acc3af12","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"7e49dcbfc4ff9dac136feefdb4469d10e239ce17609876dd768fe559a994f06e","detail":{"divided_from":"body","block":6,"kind":"p"},"prev":"genesis","hash":"fa37412b8705028de58e345eea878f789c25794febcb7ced100e8d87acc3af12"}],"claim_ids":["c3"],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d6"},{"id":"d7","kind":"p","type":null,"order":7,"text":"CORS is the escape hatch. It lets a server deliberately relax the same-origin policy for specific origins, methods, and headers. It is the web's answer to the question: \"How do we share data across origins without abandoning security entirely?\"","status":"active","vx_hash":"04802c49cace23a801e1f457b94f7f5483120259fdcbfb571ff4bbf3652b1d20","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"bb3f2f7a53fabcff92e5902073d6126f47b86917b539dbbd833f1c2bdd12336d","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"8297216b4a45ca2fb49db81b567b58a9c5598f9f62d0395c03eccab5fbc0c9ac","detail":{"divided_from":"body","block":7,"kind":"p"},"prev":"genesis","hash":"bb3f2f7a53fabcff92e5902073d6126f47b86917b539dbbd833f1c2bdd12336d"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d7"},{"id":"d8","kind":"p","type":null,"order":8,"text":"The practical stakes are enormous. APIs, CDNs, microservices, authentication providers, payment gateways — all of them rely on CORS to function across domain boundaries. A misconfigured CORS policy is not a minor bug. It is an open door or a slammed gate, depending on which direction you err.","status":"active","vx_hash":"207af21c3cba73f3df9760a3b28a0d8e227d54d526e07297b6cdaaca15cbbf0a","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"d9740fb83f10277dbf68c8d12c0879ed074944444491e43b9aaa2b1d572b5966","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"d429ac50d001c3e481b4c8d997bf7a6c8f6a47ee3c49df8db7c2018b204e0c81","detail":{"divided_from":"body","block":8,"kind":"p"},"prev":"genesis","hash":"d9740fb83f10277dbf68c8d12c0879ed074944444491e43b9aaa2b1d572b5966"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d8"},{"id":"d9","kind":"h","type":null,"order":9,"text":"## How It Works","status":"active","vx_hash":"7f21cc7e2d049d9af527c3f3c8f5b4e86f2f80e8bb88470aef2f1073ed7c4b69","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"a25bd06e67e5b1d51762497264febfdad2492bf70a2cd8de19471be9d94e1d94","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"f029fb0d33f0802e53458729c7a20710b671d86867fd9cb957609a4af8aee229","detail":{"divided_from":"body","block":9,"kind":"h"},"prev":"genesis","hash":"a25bd06e67e5b1d51762497264febfdad2492bf70a2cd8de19471be9d94e1d94"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d9"},{"id":"d10","kind":"p","type":null,"order":10,"text":"The browser classifies every cross-origin request into one of two categories: **simple requests** or **preflighted requests**.","status":"active","vx_hash":"3a9b6684127db44bcbfa9e6cce6a335dea6e687ab5ac33f4819b8b99c8d4aa8f","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"10d7fe4d26f93ca53d100965c7377cb01e2ef4afe64a0cbd2319a3a6bb894fd1","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"8ad26613c51e15b32464d4c82a98983db086a90306ce372c2b8638e0454d052c","detail":{"divided_from":"body","block":10,"kind":"p"},"prev":"genesis","hash":"10d7fe4d26f93ca53d100965c7377cb01e2ef4afe64a0cbd2319a3a6bb894fd1"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d10"},{"id":"d11","kind":"p","type":null,"order":11,"text":"A simple request uses one of these methods: GET, HEAD, or POST. Its headers are limited to the CORS-safelisted set (Accept, Accept-Language, Content-Language, Content-Type with specific values). It triggers no preflight. The browser sends the request, reads the response headers, and either delivers the response or blocks it.","status":"active","vx_hash":"0b541d8553951125ef2c9547f4b549fbd45c98cb9c769063dbd2b9f89c506fb9","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"5db05fc0779cb485a6aed19eebc919ab7c239450465b5347692df10692350dfb","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"b1a24e5519fadedfd2804dcf6a214f396cf737da97843b93521dec5e738a43fe","detail":{"divided_from":"body","block":11,"kind":"p"},"prev":"genesis","hash":"5db05fc0779cb485a6aed19eebc919ab7c239450465b5347692df10692350dfb"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d11"},{"id":"d12","kind":"p","type":null,"order":12,"text":"A preflighted request uses any other method (PUT, DELETE, PATCH), any custom header, or any Content-Type outside the safelisted values. Before the real request, the browser sends an OPTIONS request — the preflight — to the target origin. The server responds with `Access-Control-Allow-Origin`, `Access-Control-Allow-Methods`, and `Access-Control-Allow-Headers`. The browser checks these. If the origin, method, and headers are all permitted, the browser sends the actual request. If not, the browser aborts. The requesting JavaScript sees only a generic network error. No status code. No body. Nothing.","status":"active","vx_hash":"8937c771ee565f53c57718e1aef0742a3cb459d9f3f5c0ed06fef51d815758ba","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"03cc97fc606eb691d9e6989bfeefeb42160d7b5c37b05ae8e77c5b6235885472","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"6314d247c3a831c4bf63c28543df84dd6ca8d24e694c13ff74a07eb4cd8a97a8","detail":{"divided_from":"body","block":12,"kind":"p"},"prev":"genesis","hash":"03cc97fc606eb691d9e6989bfeefeb42160d7b5c37b05ae8e77c5b6235885472"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d12"},{"id":"d13","kind":"p","type":null,"order":13,"text":"The server must echo the requesting origin in `Access-Control-Allow-Origin`, or use `*` for public resources. For credentials (cookies, HTTP auth, client certs), the server must send `Access-Control-Allow-Credentials: true` and the origin must be explicit. `*` with credentials is forbidden.","status":"active","vx_hash":"3822def7ca39666686a5df050eaca5a582bfd82dc05c59a9031f8e82aa66c300","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"c3c094b57a0a40de78ed4abe7f9171b81b305fbfc0dd3e2e909f6a4521a34c31","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"4975b0af61d59393eb353493ab73e6d933c87fba72554d844c89d2a8a252dc3a","detail":{"divided_from":"body","block":13,"kind":"p"},"prev":"genesis","hash":"c3c094b57a0a40de78ed4abe7f9171b81b305fbfc0dd3e2e909f6a4521a34c31"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d13"},{"id":"d14","kind":"p","type":null,"order":14,"text":"Credentials are a footgun. If you send `Access-Control-Allow-Credentials: true` with `Access-Control-Allow-Origin: *`, the browser rejects the response. The origin must be explicit.","status":"active","vx_hash":"9665387dab1f6db8ece00e107ac3865a527d813fcebfc9c25337230c6bec6ea2","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"076e0148472726c1d6600d1e8a93b972a6d7a287d6b75ab14b2d15e23d9ebf7a","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"fae05c4ae98656fcf596acb923b0ed5857392e3cc7e3ff9d5f592a7679c8a160","detail":{"divided_from":"body","block":14,"kind":"p"},"prev":"genesis","hash":"076e0148472726c1d6600d1e8a93b972a6d7a287d6b75ab14b2d15e23d9ebf7a"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d14"},{"id":"d15","kind":"h","type":null,"order":15,"text":"## The Contract","status":"active","vx_hash":"950a4647343b9230d098c43bcf3a985f562c5060307776920f65edc8eac07844","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"d87c376a9f9caf5fecf2b6e3ec6fcbd10d701e913db81db48cff27147850423e","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"0cd93563460fd113091079213702fcf7de22a6f656d6e92aab843a96d23bc7cc","detail":{"divided_from":"body","block":15,"kind":"h"},"prev":"genesis","hash":"d87c376a9f9caf5fecf2b6e3ec6fcbd10d701e913db81db48cff27147850423e"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d15"},{"id":"d16","kind":"p","type":null,"order":16,"text":"The exact interface is a set of HTTP response headers. The browser reads them. The server sets them. No negotiation. No handshake beyond the preflight.","status":"active","vx_hash":"b11f34821dc670fdf51ed05cb2724d4ea2834e80abbbc5048710dc98804b06ec","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"10b8d304ca662d57e04ac8713a933afa3c5901329e1a2884d666e6b8004cc572","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"5f405a545b5b2692c0cae927d33ca1e447fa2c9b5ef4415f81456203dd4c3141","detail":{"divided_from":"body","block":16,"kind":"p"},"prev":"genesis","hash":"10b8d304ca662d57e04ac8713a933afa3c5901329e1a2884d666e6b8004cc572"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d16"},{"id":"d17","kind":"p","type":null,"order":17,"text":"| Header | Purpose | Example |\n|--------|---------|---------|\n| `Access-Control-Allow-Origin` | Permitted origin(s) | `https://client.com` or `*` |\n| `Access-Control-Allow-Methods` | Permitted HTTP methods | `GET, POST, PUT, DELETE` |\n| `Access-Control-Allow-Headers` | Permitted custom headers | `Content-Type, X-Auth-Token` |\n| `Access-Control-Allow-Credentials` | Allow cookies/auth | `true` (must be exact) |\n| `Access-Control-Expose-Headers` | Headers the page may read | `X-Total-Count, X-Rate-Limit` |\n| `Access-Control-Max-Age` | Preflight cache duration | `86400` (seconds) |","status":"active","vx_hash":"9d0d33ed8626fc7e174a3b639c8901a6861547870ca95c7dfc10a78564fc814a","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"bcd4d988f500c0187f547bd3ccb14d4fdb2f9b2c80bf975f9742f7166b2623ba","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"3d252635b3e2e5dd4bf5d9f61468b7b55aff5814653a23fef31427349457b07b","detail":{"divided_from":"body","block":17,"kind":"p"},"prev":"genesis","hash":"bcd4d988f500c0187f547bd3ccb14d4fdb2f9b2c80bf975f9742f7166b2623ba"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d17"},{"id":"d18","kind":"p","type":null,"order":18,"text":"The browser's contract is equally strict. If the response headers do not match the request, the response is discarded. The JavaScript caller receives no information about why. The browser's console may log the reason, but the code does not. This is deliberate: information leakage is also a security risk.","status":"active","vx_hash":"f347ab1bf39655f8d996b264d90c9ee65af199dd32318b07e94ae796cab3bdd1","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"c357f629c6c23d06c4084c37528864dd31967f051b9d309c99db5b6d462a3d80","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"e0a5a1b5358de6bd8e0b4d612b0624fbd9558ac200a4809072e8d2ad0103ece0","detail":{"divided_from":"body","block":18,"kind":"p"},"prev":"genesis","hash":"c357f629c6c23d06c4084c37528864dd31967f051b9d309c99db5b6d462a3d80"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d18"},{"id":"d19","kind":"h","type":null,"order":19,"text":"## Real Examples","status":"active","vx_hash":"26903d5d93a98ca9de8b22c6aae8193bf6d962c35ea9bb885b57051d5fbb6768","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6871882f9b8c5ab8500905e4107626c1a2b40c76a896faeaed7d507c155cace1","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"e117cb4e562f13d43f7070785d002a44b2ac990a268aba794448b69670234942","detail":{"divided_from":"body","block":19,"kind":"h"},"prev":"genesis","hash":"6871882f9b8c5ab8500905e4107626c1a2b40c76a896faeaed7d507c155cace1"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d19"},{"id":"d20","kind":"p","type":null,"order":20,"text":"**1. The API Gateway**\nA REST API at `api.example.com` serves `https://app.example.com`. The API responds with `Access-Control-Allow-Origin: https://app.example.com`. No other origin is permitted. The browser on `evil.com` sends a request, gets the response, but the browser blocks it from the page. The data never reaches the attacker.","status":"active","vx_hash":"0b0a4ba665093184f8ef0efca2c8380267759be53cccb0bf2a0496b009c07777","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"d9e2f8817e759af326936437aa3088a85a18cfa51668d6fc215666d7213522f4","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"a5ded824c00d2ffe48912abc1a7c78cf028af036971ebed5d225ab2a4c1a9b5c","detail":{"divided_from":"body","block":20,"kind":"p"},"prev":"genesis","hash":"d9e2f8817e759af326936437aa3088a85a18cfa51668d6fc215666d7213522f4"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d20"},{"id":"d21","kind":"p","type":null,"order":21,"text":"**2. The CDN with Public Assets**\nA CDN at `cdn.example.com` hosts images and fonts. It sends `Access-Control-Allow-Origin: *`. Any page can load these assets. But no page can send credentials to fetch them. The `*` wildcard and credentials are mutually exclusive.","status":"active","vx_hash":"e6011866f2f804b4e083171dcc642122e9debe5865b700a8602539ef7307ad7e","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"0f291cfef3ae669d4840be81fecba39dc05ab11705cbda70fb36cfd1b91503c1","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"42c7262f9e9d62842cca197968acd917d3ad708ba2ed868b43da6e3b52642f94","detail":{"divided_from":"body","block":21,"kind":"p"},"prev":"genesis","hash":"0f291cfef3ae669d4840be81fecba39dc05ab11705cbda70fb36cfd1b91503c1"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d21"},{"id":"d22","kind":"p","type":null,"order":22,"text":"**3. The Auth Token Exchange**\nA client at `app.example.com` sends `POST /login` with `Content-Type: application/json` and `X-Auth-Token` header. The server must respond to the preflight with `Access-Control-Allow-Headers: Content-Type, X-Auth-Token`. If the server omits `X-Auth-Token`, the browser aborts the real request. The login fails. No error message reaches the client. The developer opens DevTools and finds the CORS error in the console.","status":"active","vx_hash":"c5de75e72ee199acf9b55fcc16ac014cc410da8975e096328e55faed0bce9b00","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"f010a9af60875920bafd94f5a6e2bcc21d9133283178aa364760bf3772f25b52","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"c01edc7efb17a8be0730896b985568bb67c52b31903f2d70d622ec4ac5467bbe","detail":{"divided_from":"body","block":22,"kind":"p"},"prev":"genesis","hash":"f010a9af60875920bafd94f5a6e2bcc21d9133283178aa364760bf3772f25b52"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d22"},{"id":"d23","kind":"p","type":null,"order":23,"text":"**4. The WebSocket Upgrade**\nWebSocket connections are not subject to CORS preflight. The browser sends the upgrade request with an `Origin` header. The server checks the origin and either accepts or rejects the connection. This is not CORS, but it is the same-origin principle applied to a different protocol.","status":"active","vx_hash":"3270504b010ccea6f837776b21563446a4cf92a25e8e357134cd43ec4418f94e","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6227ae0c786bb6da50f2373b78b4b6f1f4480347c64d55c0e28cb103f0eb3e29","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"002cad97ab82a2003ea3c6dcb6e223fe5971a29eee80310008db60da818c4e03","detail":{"divided_from":"body","block":23,"kind":"p"},"prev":"genesis","hash":"6227ae0c786bb6da50f2373b78b4b6f1f4480347c64d55c0e28cb103f0eb3e29"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d23"},{"id":"d24","kind":"p","type":null,"order":24,"text":"**5. The Microservice Mesh**\nA frontend at `portal.example.com` calls `billing.example.com`, `inventory.example.com`, and `auth.example.com`. Each service must set its own CORS headers. If one service forgets, the portal breaks for that endpoint. The failure is silent. The user sees a blank widget. The network tab shows a 200 OK that the browser threw away.","status":"active","vx_hash":"2e1adc69f66ddd36c331e6d2c605511197c9740a87bc8f9ebce87325315fdbae","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"b5a2b79fae13bd1f693de41afd038a3a60703218b74cf3dd860c5b05216f14f6","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"a942fce03c6dff0426a58648af1378d33265e720bd66e56d668d08ed859c1b66","detail":{"divided_from":"body","block":24,"kind":"p"},"prev":"genesis","hash":"b5a2b79fae13bd1f693de41afd038a3a60703218b74cf3dd860c5b05216f14f6"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d24"},{"id":"d25","kind":"h","type":null,"order":25,"text":"## Common Mistakes","status":"active","vx_hash":"c1a1f3ecf7e19b63f02318ba50c376adaad335ce63b0321bf6e28797ae79bba7","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"402e9e0778a7531d7a4383b9bd73d4b8fcafcd4cbb13371086187a2c5727f1d9","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"4e22ff0650f89ac59711e7d297d6068e6b0e8cd8e48fdd7a716f26d37acb2d34","detail":{"divided_from":"body","block":25,"kind":"h"},"prev":"genesis","hash":"402e9e0778a7531d7a4383b9bd73d4b8fcafcd4cbb13371086187a2c5727f1d9"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d25"},{"id":"d26","kind":"p","type":null,"order":26,"text":"**Reflecting the origin blindly.** A server reads the `Origin` header and echoes it back unconditionally. This is not `*`. It looks like security. But if the origin is `null` (from a local file, a sandboxed iframe, or a redirect), the server reflects `null`, and the browser treats `null` as a valid origin. Some implementations also reflect `*` when the origin is missing, which is even worse. This is how misconfigured CORS becomes a vulnerability.","status":"active","vx_hash":"041b73f037ec6a333643cb43ed6e7aa1866169bc8a04b88eae0d3a332ccea820","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"d090924607525420b2554bb1d0ff24b72ffa95a5944dce3a5077db1810116276","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"891184ab7d8b616027e90a50d793cf325c5ef1458e3a8b49bb929d86c2e5548d","detail":{"divided_from":"body","block":26,"kind":"p"},"prev":"genesis","hash":"d090924607525420b2554bb1d0ff24b72ffa95a5944dce3a5077db1810116276"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d26"},{"id":"d27","kind":"p","type":null,"order":27,"text":"**Sending credentials with `*`.** The browser rejects this combination. The developer adds `credentials: 'include'` to fetch, the server sends `Access-Control-Allow-Origin: *`, and every request fails. The fix is to echo the exact origin and add `Access-Control-Allow-Credentials: true`.","status":"active","vx_hash":"a7ea6df6a575a84e96380472c02b6ed07bc10d473bd40609b62abf224f236f87","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"e4d7ee22a2d586c5a36d5618a5d10e39c2520a6f258f45044ef14d4aa4ed343f","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"8dd7088eecfdd588f9d2b77192bcab6f94dbe2e6365d0ccf5e5a14df5cd0a43d","detail":{"divided_from":"body","block":27,"kind":"p"},"prev":"genesis","hash":"e4d7ee22a2d586c5a36d5618a5d10e39c2520a6f258f45044ef14d4aa4ed343f"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d27"},{"id":"d28","kind":"p","type":null,"order":28,"text":"**Relying on the server for security.** CORS is a browser mechanism. It does not stop a curl script, a server-to-server request, or any non-browser client from calling your API. If you need access control, implement it at the API layer. CORS is defense in depth, not the primary defense.","status":"active","vx_hash":"c74170470349b6ad7aae6d07371b18627ccc3fcdcb44bbf95bb0e5854a637d60","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"18621639d7c1e0eafe6658df969920a7df08be7ff07557c3af0246945980a4a1","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"0fd9ccf9988988e0a9f899eb234bf4dc87e9ec6b9847b9c77b8a89595d9244f4","detail":{"divided_from":"body","block":28,"kind":"p"},"prev":"genesis","hash":"18621639d7c1e0eafe6658df969920a7df08be7ff07557c3af0246945980a4a1"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d28"},{"id":"d29","kind":"p","type":null,"order":29,"text":"**Caching preflight responses incorrectly.** A CDN caches a preflight response with `Access-Control-Allow-Methods: GET`. A client later tries POST. The browser uses the cached preflight, finds POST is not allowed, and fails. The server supports POST. The CDN is wrong. Cache busting or proper `Vary: Origin` headers are the fix.","status":"active","vx_hash":"422e4a36d23685bcf3a717c8069094f780bd212c60f6dcdcef1661fa0b08371b","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"3533ead1775346fc10ab305c60771330fbfde67cc085c524793a7cd1bcad5f1c","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"4c7a807268ba5da75b25f9cfbe90e72d1878aa1748e5b4ff26c0c2f2a6d9ad38","detail":{"divided_from":"body","block":29,"kind":"p"},"prev":"genesis","hash":"3533ead1775346fc10ab305c60771330fbfde67cc085c524793a7cd1bcad5f1c"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d29"},{"id":"d30","kind":"p","type":null,"order":30,"text":"**Thinking the preflight is optional.** You cannot disable preflight. The browser decides. If your API requires custom headers, the preflight happens. You can reduce the cost with `Access-Control-Max-Age`, but you cannot eliminate it.","status":"active","vx_hash":"10813a64f7ae0d237cf91bd0d783e958e68b87bef5d0af9ad7b6f837a4e8aac7","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"dd1d20b24e3aecf06d290df089f864d210f6de4009e6cf7a63a857178d08c421","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"4555d336dd08a1c443786b9056ed87e56e705efc69cd000cde63cb91490489aa","detail":{"divided_from":"body","block":30,"kind":"p"},"prev":"genesis","hash":"dd1d20b24e3aecf06d290df089f864d210f6de4009e6cf7a63a857178d08c421"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d30"},{"id":"d31","kind":"h","type":null,"order":31,"text":"## Connection to OIP","status":"active","vx_hash":"b68f09533e853e0f61de1cc01127ed89f1574106c22b3177d8d5e5f1a8003236","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"cab6c8fb303872fdd9587c4865a328b0b8ef7e5726be623f22202c21398e9d30","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"c9807008f0135b4507b1ebcb8c74e6923470ad5c384b337838f1ffbe3dcb9cee","detail":{"divided_from":"body","block":31,"kind":"h"},"prev":"genesis","hash":"cab6c8fb303872fdd9587c4865a328b0b8ef7e5726be623f22202c21398e9d30"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d31"},{"id":"d32","kind":"p","type":null,"order":32,"text":"OIP is built on the principle that systems must be open, deterministic, and auditable. CORS is a poor approximation of this, but it shares the same underlying concern: who gets to read what, and under what conditions.","status":"active","vx_hash":"c0fa9d28815c05ce1b61a9fbf3eedc1d3c6b99ec8c61565da865246918125c7f","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"b3cefdd5210c10b68d0398346b173c394236690fbc75b18c0258323e1a3c8c32","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"659035028d16aebca867314f04b95d24d27c0e2da8b79e38a75967034a18ed4c","detail":{"divided_from":"body","block":32,"kind":"p"},"prev":"genesis","hash":"b3cefdd5210c10b68d0398346b173c394236690fbc75b18c0258323e1a3c8c32"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d32"},{"id":"d33","kind":"p","type":null,"order":33,"text":"An OIP-compliant system does not hide access rules inside a browser's black-box enforcement. The rules are explicit: a directory row declares its inputs, its outputs, and its permissions. There is no silent failure. There is no request that returns 200 but delivers nothing to the caller because a header was misaligned.","status":"active","vx_hash":"6dbc015cf5e40f89c8fc8eb3e0f0ae497ad23d8a00a052296b21ae2b46b13220","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"b604d474ce742d62440b93afb31acbb6aa8eb9afbbb0ddcdb73509d412a105ab","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"c02b2ae49d0aa0f486585f8be13e7ca78dcce715873e936cf40a2d736d381d4c","detail":{"divided_from":"body","block":33,"kind":"p"},"prev":"genesis","hash":"b604d474ce742d62440b93afb31acbb6aa8eb9afbbb0ddcdb73509d412a105ab"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d33"},{"id":"d34","kind":"p","type":null,"order":34,"text":"CORS is a bridge between the old web and the OIP philosophy. It forces a server to declare its cross-origin policy in headers — a form of self-describing contract. The browser enforces that contract. The problem is opacity: the browser's decision is not auditable by the calling code, and the error is not actionable.","status":"active","vx_hash":"7e574c3b8d5b57a2913596e4abb53a4c5f9329afc3c52f7237d0b0044b3b4c9b","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"e295694999c3a7a79bef692eb19c2c05379ba284063e0220403b926737b232f2","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"8d525cdc8a0228bccbc9c1eb7130ee1d5411971b0af508d61a5d8dee59d99cd5","detail":{"divided_from":"body","block":34,"kind":"p"},"prev":"genesis","hash":"e295694999c3a7a79bef692eb19c2c05379ba284063e0220403b926737b232f2"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d34"},{"id":"d35","kind":"p","type":null,"order":35,"text":"In an OIP system, every capability is a directory row with explicit inputs and outputs. The contract is visible. The enforcement is transparent. The failure is explainable. CORS is a step toward that world, but it is trapped in a model where the browser is the intermediary and the developer is the last to know what went wrong.","status":"active","vx_hash":"ec71e859c7296e6eca7a7d3e04a97ae9498556abcc9920300de36615e05615fd","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"311f830cbab73be81a5ea1300d165a5a34c09e9b7bff1fff4087230345788665","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"07213e3e9d4dd909c24994d9093204bb9955de2f8882a910d3c2ea1f4981568b","detail":{"divided_from":"body","block":35,"kind":"p"},"prev":"genesis","hash":"311f830cbab73be81a5ea1300d165a5a34c09e9b7bff1fff4087230345788665"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d35"},{"id":"d36","kind":"p","type":null,"order":36,"text":"The lesson is this: CORS matters because cross-origin boundaries are real and dangerous. The way to get it right is to treat it as a formal contract — exact headers, exact origins, exact methods — and to verify it in practice, not in theory. That is the OIP way.","status":"active","vx_hash":"f4013eb4e6a2a166453f82c3f257963a0c021b1879687e7035490b427f083207","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"fb4308f5519a8568475262f08616ec4f6c0edeb28d23083c9cafa194fdcc90be","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"0572c09306727a62fe46cc880ee6b2557c090d773e5ee2114fb3381a707777bd","detail":{"divided_from":"body","block":36,"kind":"p"},"prev":"genesis","hash":"fb4308f5519a8568475262f08616ec4f6c0edeb28d23083c9cafa194fdcc90be"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d36"},{"id":"d37","kind":"h","type":null,"order":37,"text":"## Connection to the Grain Philosophy","status":"active","vx_hash":"dbfdbfe1f282a885371d496b9a95ed8f6534bed7b8eb32436c50fecfb8792b38","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"7802da3ac91d522626ca3bdea7ec1b64f8bb1e18ff97dbe01363e08ed77f1b3b","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"7cf89d4e08a558ae1043f7e5a55684291a237ab3124dda10f5738e251110391b","detail":{"divided_from":"body","block":37,"kind":"h"},"prev":"genesis","hash":"7802da3ac91d522626ca3bdea7ec1b64f8bb1e18ff97dbe01363e08ed77f1b3b"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d37"},{"id":"d38","kind":"p","type":null,"order":38,"text":"This protocol is part of the [Open Inventory Protocol](/a/philosophy) — a living system of self-describing voxels that serves the Grain philosophy. The OIP is the interface. The philosophy is the core.","status":"active","vx_hash":"51f8c3208f7aac2999c8ee308a90db30536bc57c5ebfb0eaea26fb2c8d35762f","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"fcfa24ca633fe2c09ecf1c0f6c8818d6f91a4caf42f6e26f943dce2332456412","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.218Z","actor":"owner","text_sha":"72e099fda668b91b17b132af617b99a34a125ed7966556f24982078ba638db82","detail":{"divided_from":"body","block":38,"kind":"p"},"prev":"genesis","hash":"fcfa24ca633fe2c09ecf1c0f6c8818d6f91a4caf42f6e26f943dce2332456412"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.218Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-cors/d38"}],"voxels":[{"id":"c1","div_id":"claim:c1","kind":"claim","text":"CORS is the browser's security mechanism that controls which web pages can request resources from other origins. It is not a firewall. It is not server-side authentication. It is the browser deciding, on the user's behalf, whether to expose a cross-origin response to the page that asked for it.","tier":"system","standing":null,"weight":0.8,"status":"active","source_ids":["s1"],"posted_by":null,"who_claims":null,"edges":[{"type":"supported_by","target":"s1","source_type":"adjacent","hash":null}],"content_hash":null,"stable_url":"https://miscsubjects.com/i/claim/oip-what-is-cors/c1","machine_url":"https://miscsubjects.com/api/articles/oip-what-is-cors/claims/c1"},{"id":"c2","div_id":"claim:c2","kind":"claim","text":"**CORS is a browser-enforced access-control protocol. A web server declares, via HTTP headers, which origins may read its responses. The browser reads those headers and either hands the response to the requesting page or blocks it with a network error.** Every cross-origin request the browser makes — `fetch`, `XMLHttpRequest`, `WebSocket`, fonts, images in canvas — is subject to this gate unless t","tier":"system","standing":null,"weight":0.8,"status":"active","source_ids":["s1"],"posted_by":null,"who_claims":null,"edges":[{"type":"supported_by","target":"s1","source_type":"adjacent","hash":null}],"content_hash":null,"stable_url":"https://miscsubjects.com/i/claim/oip-what-is-cors/c2","machine_url":"https://miscsubjects.com/api/articles/oip-what-is-cors/claims/c2"},{"id":"c3","div_id":"claim:c3","kind":"claim","text":"The web runs on the same-origin policy: a script from `bank.com` cannot read responses from `evil.com`. This is the foundation of web security. Without it, any malicious page you open could read your bank data, steal your session cookies, and act on your behalf.","tier":"system","standing":null,"weight":0.8,"status":"active","source_ids":["s1"],"posted_by":null,"who_claims":null,"edges":[{"type":"supported_by","target":"s1","source_type":"adjacent","hash":null}],"content_hash":null,"stable_url":"https://miscsubjects.com/i/claim/oip-what-is-cors/c3","machine_url":"https://miscsubjects.com/api/articles/oip-what-is-cors/claims/c3"}],"sources":[{"id":"s1","type":"adjacent","url":"https://miscsubjects.com/a/oip-what-is-cors","title":"CORS: The Browser's Cross-Origin Gate","quote":"CORS is the browser's security mechanism that controls which web pages can request resources from other origins. It is not a firewall. It is not server-side authentication. It is the browser deciding,","summary":"Primary exposition of CORS: The Browser's Cross-Origin Gate.","claim_ids":["c1","c2","c3"]}],"edges":[{"from":"c1","type":"supported_by","target":"s1","source_type":"adjacent","hash":null},{"from":"c2","type":"supported_by","target":"s1","source_type":"adjacent","hash":null},{"from":"c3","type":"supported_by","target":"s1","source_type":"adjacent","hash":null}],"counts":{"divs":38,"voxels":3,"sources":1,"edges":3},"verification":{"div_mode":true,"divs":38,"all_chains_valid":true,"body_matches_divs":true,"per_div":[{"id":"d1","order":1,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d2","order":2,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d3","order":3,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d4","order":4,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d5","order":5,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d6","order":6,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d7","order":7,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d8","order":8,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d9","order":9,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d10","order":10,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d11","order":11,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d12","order":12,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d13","order":13,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d14","order":14,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d15","order":15,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d16","order":16,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d17","order":17,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d18","order":18,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d19","order":19,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d20","order":20,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d21","order":21,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d22","order":22,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d23","order":23,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d24","order":24,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d25","order":25,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d26","order":26,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d27","order":27,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d28","order":28,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d29","order":29,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d30","order":30,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d31","order":31,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d32","order":32,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d33","order":33,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d34","order":34,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d35","order":35,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d36","order":36,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d37","order":37,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d38","order":38,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]}]},"procedure":{"what":"Every article has a human side (/a/oip-what-is-cors) and a machine side (this endpoint). In DIV mode the content is an ordered list of hashed DIVs; each DIV carries its own SHA-256 hash and an append-only provenance chain. Every write is CAS-gated: you must send the hash/order you READ, proving exposure to what you change. Every successful write returns a clickable human permalink.","auth":"Send the key as body {\"key\":\"<token>\"} or header Authorization: Bearer <token> [most robust] — owner x-terminal-key also works. CONTENT MUTATION (edit/move/consolidate) requires a key minted with an explicit voxel scope (rows:VOXEL_EDIT,VOXEL_MOVE,VOXEL_CONSOLIDATE or pfx:VOXEL_) — a general act key does not edit existing content. Filing a challenge or attestation needs no key at all.","web_runtime":"WEB CHATGPT: open https://miscsubjects.com/api/model-lane first. Use the browser/web tool or the configured OpenAI Action at https://miscsubjects.com/api/openai/actions.json. Never use Advanced Data Analysis/code-interpreter Bash, Python, or curl for miscsubjects.com. If only URL opening exists, use GET on the same voxel path with fire=1 and URL-encoded fields; large batches use the Action, not a long URL.","divide":"POST https://miscsubjects.com/api/protocol/voxel-divide {\"slug\":\"oip-what-is-cors\",\"key\":\"<token>\"} — atomize the body into DIVs (verbatim, roundtrip-checked, idempotent). act scope suffices; content is unchanged by dividing.","edit":"POST https://miscsubjects.com/api/protocol/voxel-edit {\"slug\":\"oip-what-is-cors\",\"div_id\":\"d3\",\"expected_hash\":\"<that div's CURRENT vx_hash>\",\"text\":\"<new verbatim text>\",\"actor\":\"<your model name>\",\"key\":\"<voxel-scoped token>\"} — stale hash → 409 hash_stale with the current text+hash.","move":"POST https://miscsubjects.com/api/protocol/voxel-move {\"slug\":\"oip-what-is-cors\",\"div_id\":\"d3\",\"expected_order\":<current order>,\"direction\":\"up|down\",\"key\":\"<voxel-scoped token>\"} — stale order → 409 order_stale with the current layout.","consolidate":"POST https://miscsubjects.com/api/protocol/voxel-consolidate {\"slug\":\"oip-what-is-cors\",\"div_ids\":[\"d3\",\"d4\"],\"expected_hashes\":[\"<d3 hash>\",\"<d4 hash>\"],\"text\":\"<optional merged text>\",\"actor\":\"<model>\",\"key\":\"<voxel-scoped token>\"}","challenge":"POST https://miscsubjects.com/api/protocol/voxel-challenge {\"slug\":\"oip-what-is-cors\",\"expected_thread_head\":\"<thread_head from /discourse>\",\"target_div\":\"d3\",\"expected_hash\":\"<d3 hash>\",\"stance\":\"challenge|support|upgrade\",\"body\":\"<steelmanned objection>\",\"actor\":\"<model>\"} — open intake, no key needed. Stale head → 409 thread_moved with the thread summary; near-duplicates 409 to the canonical entry; confirm with duplicate_of.","attest":"POST https://miscsubjects.com/api/protocol/voxel-attest {\"slug\":\"oip-what-is-cors\",\"outcome\":\"novel_objection|duplicate_confirm|upgrade_proposal|nothing_to_add\",\"content_hash\":\"<the body sha you read>\",\"actor\":\"<model>\"} — the four-outcome close of a keyed read. A norm, not a lock: reading stays free; only an artifact proves reading.","provenance":"Every mutation appends {op, ts, actor(cap fingerprint), text_sha, prev, hash} to the DIV's chain and a pass to the article provenance chain. Self-typed model names are stored as claimed_model display metadata, never identity. Verify: GET /api/articles/oip-what-is-cors/voxels — chains recomputed from genesis, never trusted.","batch":"POST https://miscsubjects.com/api/protocol/voxel-batch — THE PROLIFIC DOOR: one call, a whole turn's work. Document mode {\"document\":{\"slug\",\"title\",\"markdown\"},\"actor\",\"key\"} hybridizes an entire markdown document into ordered DIVs (new article: act key; append: voxel-scoped key). Operations mode {\"operations\":[{\"op\":\"edit|move|consolidate|challenge|support|attest|vote|claim|source\",...}],\"key\"} runs up to 300 ops with per-op receipts. Append your session's output to the ledger, not the chat. Format precedent: https://miscsubjects.com/a/append-protocol","vote":"POST https://miscsubjects.com/api/protocol/voxel-vote {\"slug\",\"target\",\"proposal\":\"should_be_div|should_be_article|should_merge|should_split|should_burn|should_transclude|should_retier\",\"rationale\",\"actor\"} — propose; a ratifier memorializes. POST https://miscsubjects.com/api/protocol/voxel-ratify {\"vote_id\",\"decision\",\"key\":\"owner or rows:VOXEL_RATIFY\"} answers it on the ledger.","burn":"POST https://miscsubjects.com/api/protocol/voxel-burn {\"ids\":[...]|\"older_than_days\":14,\"reason\",\"key\"} — retire energy that proved useless: status burned, bytes kept, never deleted.","discourse":"GET https://miscsubjects.com/api/articles/oip-what-is-cors/discourse — every filed objection/support/attestation, OPEN first. Human side renders the same index at /a/oip-what-is-cors#disc-<id>.","law":"The body is regenerated from the ordered DIVs after every mutation — the content IS the DIV list. Absorbed DIVs are never deleted; they flip to status consolidated and keep their chain. End a write turn by handing the human the link the response gives you."},"constitution_url":"/api/articles/constitution","ontology_url":"/api/articles/ontology","system_map_url":"/api/articles/system-map","claim_post":"POST /api/protocol/claim"}