Timeout on slow connection

[slavslavov]

I have a get handler and I am serving a large file ~25MB. One of my users reported that his connection is terminated and he can't download the whole file. It turned out his connection to the server is very slow. I managed to reproduce the issue locally by introducing some latency and network issues on my local network with this command:

sudo tc qdisc add dev lo root netem delay 200ms loss 2% rate 50kbps

and I see the onAborted handler is called. Putting a breakpoint there I saw it is called from the timeout handler

Question: How do I handle slow connections? Can I configure the timeout or disable it? Or maybe register a callback where I can return true/false if I would like to abort on timeout?

I am using version 20.71.0

Here is part of my code:

std::string url{req->getUrl()};
res->writeHeader("Content-Type", myContentType);
if (res->tryEnd(myContent, myContent.size()).first)
{
    res->end();
}
else
{
    auto isAborted = std::make_shared<bool>(false);
    res->onWritable([res, isAborted, it, url](uintmax_t offset) mutable -> bool {
        auto size = myContent.size();
        NBLOGD("OnWritable offset for url '{}': {} from total: {}", url, offset, size);
        if (!*isAborted)
        {
            if (size > offset)
            {
                std::string_view chunk{myContent.data() + offset, size - offset};
                if (res->tryEnd(chunk, chunk.size()).first)
                {
                    NBLOGD("Final offset for url '{}': {} from total: {}", url, res->getWriteOffset(), size);
                    res->close();
                }
            }
            else
            {
                res->end();
            }
            return true;
        }
        else
        {
            NBLOGD("Aborted url {} ...", url);
            return false;
        }
    });
    
    res->onAborted([isAborted]() {
        NBLOGD("OnAborted");
        *isAborted = true;
    });
}