methodhttp2.ServerHttp2Stream.additionalHeadersadditionalHeaders(headers: OutgoingHttpHeaders): void;Sends an additional informational HEADERS frame to the connected HTTP/2 peer.Referenced typesinterface OutgoingHttpHeadersaccept?: string | string[]accept-charset?: string | string[]accept-encoding?: string | string[]accept-language?: string | string[]accept-ranges?: stringaccess-control-allow-credentials?: stringaccess-control-allow-headers?: stringaccess-control-allow-methods?: stringaccess-control-allow-origin?: stringaccess-control-expose-headers?: stringaccess-control-max-age?: stringaccess-control-request-headers?: stringaccess-control-request-method?: stringage?: stringallow?: stringauthorization?: stringcache-control?: stringcdn-cache-control?: stringconnection?: string | string[]content-disposition?: stringcontent-encoding?: stringcontent-language?: stringcontent-length?: string | numbercontent-location?: stringcontent-range?: stringcontent-security-policy?: stringcontent-security-policy-report-only?: stringcontent-type?: stringcookie?: string | string[]date?: stringdav?: string | string[]dnt?: stringetag?: stringexpect?: stringexpires?: stringforwarded?: stringfrom?: stringhost?: stringif-match?: stringif-modified-since?: stringif-none-match?: stringif-range?: stringif-unmodified-since?: stringlast-modified?: stringlink?: string | string[]location?: stringmax-forwards?: stringorigin?: stringpragma?: string | string[]proxy-authenticate?: string | string[]proxy-authorization?: stringpublic-key-pins?: stringpublic-key-pins-report-only?: stringrange?: stringreferer?: stringreferrer-policy?: stringrefresh?: stringretry-after?: stringsec-websocket-accept?: stringsec-websocket-extensions?: string | string[]sec-websocket-key?: stringsec-websocket-protocol?: string | string[]sec-websocket-version?: stringserver?: stringset-cookie?: string | string[]strict-transport-security?: stringte?: stringtrailer?: stringtransfer-encoding?: stringupgrade?: stringupgrade-insecure-requests?: stringuser-agent?: stringvary?: stringvia?: string | string[]warning?: stringwww-authenticate?: string | string[]x-content-type-options?: stringx-dns-prefetch-control?: stringx-frame-options?: stringx-xss-protection?: string