response.addTrailers(headers)

• headers <Object>

此方法向响应添加 HTTP 尾随标头（标头，但位于消息末尾）。

只有在响应使用分块编码时才会触发尾标； 如果不是（例如，如果请求是 HTTP/1.0），则它们将被静默丢弃。

HTTP 要求发送 Trailer 标头以发出尾标，其值中包含标头字段列表。 例如，

response.writeHead(200, { 'Content-Type': 'text/plain',
                          'Trailer': 'Content-MD5' });
response.write(fileData);
response.addTrailers({ 'Content-MD5': '7895bf4b8828b55ceaf47747b4bca667' });
response.end();

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。

• headers <Object>

This method adds HTTP trailing headers (a header but at the end of the message) to the response.

Trailers will only be emitted if chunked encoding is used for the response; if it is not (e.g. if the request was HTTP/1.0), they will be silently discarded.

HTTP requires the Trailer header to be sent in order to emit trailers, with a list of the header fields in its value. E.g.,

response.writeHead(200, { 'Content-Type': 'text/plain',
                          'Trailer': 'Content-MD5' });
response.write(fileData);
response.addTrailers({ 'Content-MD5': '7895bf4b8828b55ceaf47747b4bca667' });
response.end();

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