support skip tls per request

server/lib/aiGatewayUpstreamFetch.ts

@@ -0,0 +1,68 @@
+import http from "node:http";
+import https from "node:https";
+import { Readable } from "node:stream";
+
+type UpstreamFetchInit = {
+    method: string;
+    headers: Record<string, string>;
+    body?: string;
+    skipTlsVerification?: boolean;
+};
+
+const insecureHttpsAgent = new https.Agent({
+    rejectUnauthorized: false,
+    keepAlive: true
+});
+
+export function aiGatewayUpstreamFetch(
+    url: string,
+    init: UpstreamFetchInit
+): Promise<Response> {
+    const parsed = new URL(url);
+    const isHttps = parsed.protocol === "https:";
+    const lib = isHttps ? https : http;
+    const agent =
+        isHttps && init.skipTlsVerification ? insecureHttpsAgent : undefined;
+
+    return new Promise((resolve, reject) => {
+        const req = lib.request(
+            url,
+            {
+                method: init.method,
+                headers: init.headers,
+                agent
+            },
+            (res) => {
+                const headers = new Headers();
+                for (const [key, value] of Object.entries(res.headers)) {
+                    if (value === undefined) {
+                        continue;
+                    }
+                    if (Array.isArray(value)) {
+                        for (const entry of value) {
+                            headers.append(key, entry);
+                        }
+                    } else {
+                        headers.set(key, value);
+                    }
+                }
+
+                const body = Readable.toWeb(res) as ReadableStream<Uint8Array>;
+                resolve(
+                    new Response(body, {
+                        status: res.statusCode ?? 502,
+                        statusText: res.statusMessage,
+                        headers
+                    })
+                );
+            }
+        );
+
+        req.on("error", reject);
+
+        if (init.body !== undefined) {
+            req.write(init.body);
+        }
+        req.end();
+    });
+}