HttpOperations.java 文件源码

@Override
public final NettyOutbound sendFile(Path file, long position, long count) {
    Objects.requireNonNull(file);

    if (hasSentHeaders()) {
        return super.sendFile(file, position, count);
    }

    if (!HttpUtil.isTransferEncodingChunked(outboundHttpMessage()) && !HttpUtil.isContentLengthSet(
            outboundHttpMessage()) && count < Integer.MAX_VALUE) {
        outboundHttpMessage().headers()
                             .setInt(HttpHeaderNames.CONTENT_LENGTH, (int) count);
    }
    else if (!HttpUtil.isContentLengthSet(outboundHttpMessage())) {
        outboundHttpMessage().headers()
                             .remove(HttpHeaderNames.CONTENT_LENGTH)
                             .remove(HttpHeaderNames.TRANSFER_ENCODING);
        HttpUtil.setTransferEncodingChunked(outboundHttpMessage(), true);
    }

    return super.sendFile(file, position, count);
}