method OutgoingMessage.prototype.addTrailers
Usage in Deno
```typescript import { OutgoingMessage } from "node:node__http.d.ts"; ```
OutgoingMessage.prototype.addTrailers(headers: OutgoingHttpHeaders | ReadonlyArray<[string, string]>): void
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.
```js
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.
headers: OutgoingHttpHeaders | ReadonlyArray<[string, string]>
void