outgoingMessage.setHeaders(headers)

• headers <Headers> | <Map>
• 返回：<this>

为隐式头设置多个头值。headers 必须是 Headers 的实例或 Map，如果待发送的头中已经存在该头，它的值将被替换。

🌐 Sets multiple header values for implicit headers. headers must be an instance of Headers or Map, if a header already exists in the to-be-sent headers, its value will be replaced.

const headers = new Headers({ foo: 'bar' });
outgoingMessage.setHeaders(headers); 拷贝

或者

🌐 or

const headers = new Map([['foo', 'bar']]);
outgoingMessage.setHeaders(headers); 拷贝

当使用 outgoingMessage.setHeaders() 设置了头信息时，它们会与传递给 response.writeHead() 的任何头信息合并，并且传递给 response.writeHead() 的头信息具有优先权。

🌐 When headers have been set with outgoingMessage.setHeaders(), they will be merged with any headers passed to response.writeHead(), with the headers passed to response.writeHead() given precedence.

// Returns content-type = text/plain
const server = http.createServer((req, res) => {
  const headers = new Headers({ 'Content-Type': 'text/html' });
  res.setHeaders(headers);
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('ok');
}); 拷贝