30:T4aa,Exports a CORS proxy helper and maintains a list of proxy services. *Important:* - *Most proxies have strict rate limits.* - *Some proxies may not pass through a 404 response status and instead return status 200.* ### Usage ~~~js import {proxyUrl} from "@mootari/cors-proxies" ~~~ ~~~js fetch(proxyUrl(url)) ~~~ ### Overriding the default proxy Either pass a proxy name or function directly to `proxyUrl`: ```js proxyUrl(url, "corsproxy.io") // One of the defined proxies proxyUrl(url, url => /* proxied URL */) ``` Or pass it on import: To override the default proxy, either pass it with the import: ~~~js defaultProxy = "corsproxy.io" // or a function ~~~ ~~~js import {proxyUrl} with {defaultProxy} from "@mootari/cors-proxies" ~~~ ### Todo - Add a fetch helper to handle rate limits ### See also - [reynaldichernando / CORS Proxies (Updated 2025)](https://gist.github.com/reynaldichernando/eab9c4e31e30677f176dc9eb732963ef) - [jimmywarting / Cors proxies](https://gist.github.com/jimmywarting/ac1be6ea0297c16c477e17f8fbe51347) 31:T5f2,proxies = ({ "allorigins.win": { home: "https://allorigins.win/", url: url => `https://api.allorigins.win/raw?url=${url}`, caveat: "Frequent server errors" }, "whateverorigin.org": { home: "https://whateverorigin.org/", url: url => `https://whateverorigin.org/get?url=${encodeURIComponent(url)}`, caveat: "Returns {status, contents} instead of the raw response; seems to be down" }, // 2026-06-06: No longer available due to abuse. See https://github.com/jolav/codetabs/issues/43#issuecomment-4661049241 // "codetabs.com": { // home: "https://codetabs.com/cors-proxy/cors-proxy.html", // url: url => `https://api.codetabs.com/v1/proxy?quest=${url}`, // caveat: "Does not support POST", // }, // 2026-02-05: Free usage limited to localhost // "corsproxy.io": { // home: "https://corsproxy.io/", // url: url => `https://corsproxy.io/?url=${url}`, // }, // "cors.lol": { // home: "https://cors.lol/", // url: url => `https://api.cors.lol/?url=${encodeURIComponent(url)}`, // caveat: "Absurdly low rate limit without a paid plan", // }, // 2025-05-25: Not active // "htmldriven.com": { // home: "https://cors-proxy.htmldriven.com/", // url: url => `https://cors-proxy.htmldriven.com/?url=${url}`, // }, // 2025-05-25: Appears to only return 500 // "thebugging.com": { // home: "https://www.thebugging.com/apis/cors-proxy", // url: url => `https://api.thebugging.com/cors-proxy?url=${url}`, // }, })32:[] 2e:{"title":"CORS Proxies","cells":[{"id":58,"value":"# CORS Proxies","pinned":false,"hidden":false,"mode":"md"},{"id":0,"value":"$30","pinned":false,"hidden":false,"mode":"md"},{"id":104,"value":"\n---\n## Proxies","pinned":false,"hidden":false,"mode":"md"},{"id":7,"value":"viewof testUrl = {\n const form = Inputs.url({\n submit: true,\n required: true,\n width: \"100%\",\n label: \"Test URL\",\n value: \"https://echo.free.beeceptor.com/\",\n autocomplete: \"off\",\n datalist: [\n \"https://echo.free.beeceptor.com/\",\n document.baseURI,\n \"https://observablehq.com/this-url-does-not-exist\", // reported as 200 by some\n \"https://does-not-exist.test\",\n ]\n });\n const enableSubmit = () => form.elements[1].disabled = false;\n form.addEventListener(\"input\", enableSubmit);\n enableSubmit();\n \n return form;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":152,"value":"viewof method = Inputs.radio([\"GET\", \"POST\"], {value: \"GET\", label: \"Method\"})","pinned":false,"hidden":false,"mode":"ojs"},{"id":21,"value":"Inputs.table(results, {\n columns: [\"status\", \"name\", \"url\"],\n layout: \"auto\",\n format: {\n status: (p, i, a) => {\n const placeholder = htl.html`

⏳`;\n Promise.all([p, a[i].body]).then(\n ([status, body]) => placeholder.replaceWith(status && body?.method === method\n ? htl.html`${status}`\n : htl.html`❌`\n )\n );\n return placeholder;\n },\n name: (d, i, a) => {\n const {home, caveat} = a[i];\n return htl.html`${d}${caveat ? htl.html`

${caveat}` : \"\"}`;\n },\n url: d => htl.html`${d}`,\n }\n})","pinned":false,"hidden":false,"mode":"ojs"},{"id":12,"value":"results = {\n const controller = new AbortController();\n invalidation.then(() => controller.abort());\n const {signal} = controller;\n\n return Object.entries(proxies).map(([name, {home, url, caveat}]) => {\n const proxiedUrl = url(testUrl);\n const response = fetch(proxiedUrl, {signal, cache: \"no-cache\", method}).catch(() => undefined);\n return {\n name, \n home,\n caveat,\n url: proxiedUrl,\n status: response.then(r => r?.status ?? false),\n body: response.then(r => r?.json().catch(() => response.text()).catch(e => e))\n };\n });\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":50,"value":"---\n## Appendix","pinned":false,"hidden":false,"mode":"md"},{"id":19,"value":"proxyUrl = (url, proxy = defaultProxy) => (typeof proxy === \"function\" ? proxy : proxies[proxy].url)(url)","pinned":true,"hidden":false,"mode":"ojs"},{"id":63,"value":"defaultProxy = \"allorigins.win\"","pinned":true,"hidden":false,"mode":"ojs"},{"id":5,"value":"$31","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W32","stdlib":"1","titling":"auto"}