@httpland/http-conditional-requests
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HTTP Conditional Requests middleware for Fetch API
HTTP Conditional Requests middleware for Fetch API.
Middleware for HTTP Conditional Requests.
It conditionally processes a HTTP request based on a precondition.
It compliant with RFC 9110, 13. Conditional Requests.
For a definition of Universal HTTP middleware, see the http-middleware project.
Middleware factory is exported by default.
To evaluate precondition, you need to provide a function to retrieve the selected representation.
The following example evaluates the If-None-Match precondition and controls
the handler.
import conditionalRequests from "https://deno.land/x/http_conditional_requests@$VERSION/mod.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
import { assertSpyCalls, spy } from "https://deno.land/std/testing/mock.ts";
const selectedRepresentation = new Response("<body>", {
headers: { etag: "<etag>" },
});
const selectRepresentation = spy(() => selectedRepresentation);
const middleware = conditionalRequests(selectRepresentation);
const conditionalRequest = new Request("<uri>", {
headers: { "if-none-match": "<etag>" },
});
const handler = spy(() => selectedRepresentation);
const response = await middleware(conditionalRequest, handler);
assertSpyCalls(handler, 0);
assertSpyCalls(selectRepresentation, 1);
assertEquals(response.status, 304);
RFC 9110, 13.1. Preconditions compliant and supports the following precondition:
If multiple precondition headers are present, precondition is processed according to precedence.
Middleware will effect following:
Middleware will execute only if the following conditions are met:
If-Match
ETag header existIf-None-Match
ETag header existIf-Modified-Since
Last-Modified header existIf-Unmodified-Since
Last-Modified header existCopyright © 2023-present httpland.
Released under the MIT license
FAQs
HTTP Conditional Requests middleware for Fetch API
We found that @httpland/http-conditional-requests demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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