fix(node): do not url-encode upgrade response headers

`sendResponse` was passing header keys and values through
`encodeURIComponent`, mangling legitimate values like
`WWW-Authenticate: Bearer realm="crossws"`. Write them verbatim.

Closes #186

Author: pi0

src/adapters/node.ts

@@ -219,10 +219,7 @@ class NodeReqProxy extends StubRequest {
 async function sendResponse(socket: Duplex, res: Response) {
   const head = [
     `HTTP/1.1 ${res.status || 200} ${res.statusText || ""}`,
-    ...[...res.headers.entries()].map(
-      ([key, value]) =>
-        `${encodeURIComponent(key)}: ${encodeURIComponent(value)}`,
-    ),
+    ...[...res.headers.entries()].map(([key, value]) => `${key}: ${value}`),
   ];
   socket.write(head.join("\r\n") + "\r\n\r\n");
   if (res.body) {

test/_utils.ts

@@ -126,8 +126,7 @@ class WebSocketInspector extends Agent {
     const out: Record<string, string> = {};
     if (!headers) return out;
     for (const [key, value] of Object.entries(headers)) {
-      const joined = Array.isArray(value) ? value.join(", ") : value;
-      out[decodeURIComponent(key).toLowerCase()] = decodeURIComponent(joined);
+      out[key.toLowerCase()] = Array.isArray(value) ? value.join(", ") : value;
     }
     return out;
   }

test/fixture/_shared.ts

@@ -69,7 +69,10 @@ export function createDemo<T extends Adapter<any, any>>(
             return new Response("unauthorized", {
               status: 401,
               statusText: "Unauthorized",
-              headers: { "x-error": "unauthorized" },
+              headers: {
+                "x-error": "unauthorized",
+                "www-authenticate": 'Bearer realm="crossws"',
+              },
             });
           },
         };

test/tests.ts

@@ -149,6 +149,7 @@ export function wsTests(getURL: () => string, opts: WSTestOpts): void {
       headers: {
         "content-type": expect.stringMatching(/^text\/plain/),
         "x-error": "unauthorized",
+        "www-authenticate": 'Bearer realm="crossws"',
       },
     });
   });