[Node] 错误集锦

设置 cookie 报错

• 错误信息
  Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

• 错误原因
  response.setHeader 必须在 response.writeHead 之前使用

res.setHeader('Set-Cookie', ['username=test; httpOnly']);
res.writeHead(200, { 'Content-Type': 'text/plain' });
res.end(req.headers.cookie);

https://stackoverflow.com/questions/7042340/error-cant-set-headers-after-they-are-sent-to-the-client