http-cors
CORS middleware for standard Request and Response.
Middleware
For a definition of Universal HTTP middleware, see the http-middleware project.
Usage
Middleware is exported by default.
In this example, the access-control-allow-origin header will add in the case
of a CORS request.
import cors from "https://deno.land/x/http_cors@$VERSION/mod.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
const middleware = cors();
const response = await middleware(
new Request("http://api.test", { headers: { origin: "http://cors.test" } }),
(request) => new Response("ok"),
);
assertEquals(response.headers.get("access-control-allow-origin"), "*");It also returns a Request for CORS Preflight in the case of a CORS Preflight
request.
import cors from "https://deno.land/x/http_cors@$VERSION/mod.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
const preflightRequest = new Request("http://api.test", {
method: "OPTIONS",
headers: {
origin: "http://cors.test",
"access-control-request-method": "POST",
"access-control-request-headers": "content-type",
},
});
const middleware = cors();
const response = await middleware(
preflightRequest,
(request) => new Response("ok"),
);
assertEquals(response.status, 204);
assertEquals(await response.text(), "");
assertEquals(response.headers.get("access-control-allow-origin"), "*");License
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