outgoingMessage.addTrailers(headers)

• headers <Object>

添加 HTTP 尾标（标头，但在消息末尾）到消息。

如果消息被分块编码，则仅块头将被触发。 如果没有，则块头将被默默丢弃。

HTTP 要求发送 Trailer 标头以发出块头，其值中包含标头字段名称列表，例如

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

Adds HTTP trailers (headers but at the end of the message) to the message.

Trailers will only be emitted if the message is chunked encoded. If not, the trailers will be silently discarded.

HTTP requires the Trailer header to be sent to emit trailers, with a list of header field names in its value, e.g.

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

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