response.setHeader(name, value)

• name <string>
• value <string> | <string[]>

为隐式标头设置单个标头值。 如果该标头已经存在于待发送的标头中，则其值将被替换。 在此处使用字符串数组发送具有相同名称的多个标头。

response.setHeader('Content-Type', 'text/html; charset=utf-8');

或者

response.setHeader('Set-Cookie', ['type=ninja', 'language=javascript']);

尝试设置包含无效字符的标头字段名称或值将导致抛出 TypeError。

当标头已使用 response.setHeader() 设置时，则它们将与任何传给 response.writeHead() 的标头合并，其中传给 response.writeHead() 的标头优先。

// 返回 content-type = text/plain
const server = http2.createServer((req, res) => {
  res.setHeader('Content-Type', 'text/html; charset=utf-8');
  res.setHeader('X-Foo', 'bar');
  res.writeHead(200, { 'Content-Type': 'text/plain; charset=utf-8' });
  res.end('ok');
});

• name <string>
• value <string> | <string[]>

Sets a single header value for implicit headers. If this header already exists in the to-be-sent headers, its value will be replaced. Use an array of strings here to send multiple headers with the same name.

response.setHeader('Content-Type', 'text/html; charset=utf-8');

or

response.setHeader('Set-Cookie', ['type=ninja', 'language=javascript']);

Attempting to set a header field name or value that contains invalid characters will result in a TypeError being thrown.

When headers have been set with response.setHeader(), 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 = http2.createServer((req, res) => {
  res.setHeader('Content-Type', 'text/html; charset=utf-8');
  res.setHeader('X-Foo', 'bar');
  res.writeHead(200, { 'Content-Type': 'text/plain; charset=utf-8' });
  res.end('ok');
});