diff --git a/src/Utilities/Utilities.ts b/src/Utilities/Utilities.ts
index 86c532d..6c39272 100644
--- a/src/Utilities/Utilities.ts
+++ b/src/Utilities/Utilities.ts
@@ -32,15 +32,56 @@ type Cookie = {
   secure?: boolean;
 };
 
-export const setCookie = (
-  headers: Headers,
-  cookie: Cookie
-): Headers => {
-  throw new Error('unimplemented');
+
+export const setCookie = (headers: Headers) => (cookie: Cookie): Headers => {
+  const {
+    name,
+    value,
+    domain,
+    path = '/',
+    expires,
+    httpOnly,
+    maxAge,
+    sameSite,
+    secure,
+  } = cookie;
+
+  let cookieString = `${name}=${value}; Path=${path}`;
+  if (domain) cookieString += `; Domain=${domain}`;
+  if (maxAge) cookieString += `; Max-Age=${maxAge}`;
+  if (expires !== undefined) {
+    cookieString += `; Expires=${expires === 0 ? 'Thu, 01 Jan 1970 00:00:00 GMT' : (expires as Date).toUTCString()}`;
+  }
+  if (secure) cookieString += `; Secure`;
+  if (httpOnly) cookieString += `; HttpOnly`;
+  if (sameSite) cookieString += `; SameSite=${sameSite}`;
+
+  const key = Object.keys(headers).find(k => k.toLowerCase() === 'set-cookie') || 'set-cookie';
+  const existing = headers[key] || [];
+
+  return {
+    ...headers,
+    [key]: [...existing, cookieString],
+  };
 };
 
-export const getCookie = (
-  headers: Headers
-) => (name: string): string => {
-  throw new Error('unimplemented');
-}
+
+export const getCookie = (headers: Headers) => (name: string): Cookie | undefined => {
+  const cookieKey = Object.keys(headers).find(k => k.toLowerCase() === 'cookie');
+  if (!cookieKey) return undefined;
+
+  const cookieString = headers[cookieKey].join('; ');
+  const cookieParts = cookieString.split(';').map(c => c.trim());
+
+  for (const part of cookieParts) {
+    const [k, ...rest] = part.split('=');
+    if (k === name) {
+      return {
+        name: k,
+        value: rest.join('=')
+      };
+    }
+  }
+
+  return undefined;
+};
\ No newline at end of file