Fix flakey cypress test

test/cypress/e2e/api/AccessListHostToggle.cy.js

@@ -192,7 +192,11 @@ describe('Access Lists across Proxy Host disable/enable', () => {
 			expect(data).to.be.equal(true);
 		});
 
+		// Each delete signals an nginx reload and returns immediately. A request
+		// made while the workers are being swapped can be reset by the nginx
+		// serving the API (502 from squid), so let each reload settle first.
 		[authListId, clientListId].forEach((id) => {
+			cy.wait(1500);
 			cy.task('backendApiDelete', {
 				token: token,
 				path:  `/api/nginx/access-lists/${id}`,

test/cypress/plugins/backendApi/client.mjs

@@ -1,3 +1,4 @@
+import http from "node:http";
 import axios from "axios";
 import logger from "./logger.mjs";
 
@@ -8,6 +9,10 @@ const BackendApi = function (config, token) {
 	this.axios = axios.create({
 		baseURL: config.baseUrl,
 		timeout: 90000,
+		// Don't reuse sockets: a pooled keep-alive connection that squid or the
+		// backend has since closed fails with a 502 (ERR_READ_ERROR 104), which
+		// made tests flaky.
+		httpAgent: new http.Agent({ keepAlive: false }),
 	});
 };