public RequestContextExporterBuilder responseHeader(CharSequence headerName, String alias) {
        requireNonNull(headerName, "headerName");
        requireNonNull(alias, "alias");
        defaultExportGroupBuilder.responseHeader(headerName, alias);
        return this;
    }
Adds the specified HTTP response header name to the export list.
The specified {@code alias} is used for the export key.
core/src/main/java/com/linecorp/armeria/common/logging/RequestContextExporterBuilder.java