fix(coding-agent): configure HTTP idle timeout (#4759)

packages/coding-agent/src/core/http-dispatcher.ts

@@ -0,0 +1,55 @@
+import * as undici from "undici";
+
+export const DEFAULT_HTTP_IDLE_TIMEOUT_MS = 300_000;
+
+export const HTTP_IDLE_TIMEOUT_CHOICES = [
+	{ label: "30 sec", timeoutMs: 30_000 },
+	{ label: "1 min", timeoutMs: 60_000 },
+	{ label: "2 min", timeoutMs: 120_000 },
+	{ label: "5 min", timeoutMs: 300_000 },
+	{ label: "disabled", timeoutMs: 0 },
+] as const;
+
+export function parseHttpIdleTimeoutMs(value: unknown): number | undefined {
+	if (typeof value === "string") {
+		const trimmed = value.trim();
+		if (trimmed.toLowerCase() === "disabled") {
+			return 0;
+		}
+		if (trimmed.length === 0) {
+			return undefined;
+		}
+		return parseHttpIdleTimeoutMs(Number(trimmed));
+	}
+
+	if (typeof value !== "number" || !Number.isFinite(value) || value < 0) {
+		return undefined;
+	}
+	return Math.floor(value);
+}
+
+export function formatHttpIdleTimeoutMs(timeoutMs: number): string {
+	const choice = HTTP_IDLE_TIMEOUT_CHOICES.find((item) => item.timeoutMs === timeoutMs);
+	if (choice) {
+		return choice.label;
+	}
+	return `${timeoutMs / 1000} sec`;
+}
+
+export function configureHttpDispatcher(timeoutMs: number = DEFAULT_HTTP_IDLE_TIMEOUT_MS): void {
+	const normalizedTimeoutMs = parseHttpIdleTimeoutMs(timeoutMs);
+	if (normalizedTimeoutMs === undefined) {
+		throw new Error(`Invalid HTTP idle timeout: ${String(timeoutMs)}`);
+	}
+	undici.setGlobalDispatcher(
+		new undici.EnvHttpProxyAgent({
+			allowH2: false,
+			bodyTimeout: normalizedTimeoutMs,
+			headersTimeout: normalizedTimeoutMs,
+		}),
+	);
+	// Keep fetch and the dispatcher on the same undici implementation. Node 26.0's
+	// bundled fetch can otherwise consume compressed responses through npm undici's
+	// dispatcher without decompressing them, causing response.json() failures.
+	undici.install?.();
+}