Can a single request image display, request page only display page content? - linux

Question

I use epoll to get the file descriptor that needs to be read, and when I request a page with an image, my socket only receives one request for the page, and no further events are fired.
When I requested the image individually, it successfully accepted the request and returned.
When I looked at the browser's request, it also requested twice, once for a page and once for an image.
I tried not to use epoll, but it still does.
There are times when I can request an image, such as when I go to the next page and return.
Also, when using epoll, the listening socket accepts multiple connections, shouldn't you only use the same connection? Why would it accept other connections when it seems to do nothing?
void Server::serverListen()
{
int listenfd = socket(AF_INET, SOCK_STREAM, 0);
assert(listenfd >= 0);
sockaddr_in addr;
bzero(&addr, sizeof(addr));
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(port);
addr.sin_family = AF_INET;
int tmp = 1;
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &tmp, sizeof(tmp));
int ret = bind(listenfd, (sockaddr*)&addr, sizeof(addr));
assert(ret >= 0);
ret = listen(listenfd, 5);
assert(ret >= 0);
int epollfd = epoll_create(5);
assert(epollfd != -1);
epoll_event events;
events.data.fd = listenfd;
events.events = EPOLLIN;
int n = epoll_ctl(epollfd, EPOLL_CTL_ADD, listenfd, &events);
assert(n != -1);
epoll_event eve[10000];
while (true)
{
int num = epoll_wait(epollfd, eve, 10000, -1);
assert(num != -1);
for (int i = 0; i < num; ++i)
{
int fd = eve[i].data.fd;
if (fd == listenfd)
{
sockaddr_in caddr;
socklen_t tmplen = sizeof(caddr);
connfd = accept(listenfd, (sockaddr*)&caddr, &tmplen);
assert(connfd != -1);
int flag = fcntl(connfd, F_GETFL);
flag |= O_NONBLOCK;
fcntl(connfd, F_SETFL, flag);
epoll_event even;
even.data.fd = connfd;
even.events = EPOLLIN | EPOLLET | EPOLLONESHOT;
int n = epoll_ctl(epollfd, EPOLL_CTL_ADD, connfd, &even);
assert(n != -1);
}
else
{
worker.init(eve[i].data.fd, epollfd, "localhost", "us", "mm", "usersdb", 3306, 5);
threadpool->add(&worker);
}
}
}
close(epollfd);
close(listenfd);
}