这个答案不是答案,而是显示问题发生在哪里curl
。我在libcurl
与Civet
基于mongoose
.
我遇到了同样的问题,并确实strace
尝试调试。这是来自strace
(每行的时间戳以秒为单位)的输出。问题在于,在发送标头之后,在发送正文之前,有一系列poll( ...events=POLLIN...)
调用会阻塞总共 1000 毫秒 (1+98+1+900)。您可以看到从 17.935024 到 18.931842 的时间戳差距。
17.934881 socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
17.934898 fcntl(5, F_GETFL) = 0x2 (flags O_RDWR)
17.934916 fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 0
17.934934 connect(5, {sa_family=AF_INET, sin_port=htons(37034), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in progress)
17.934952 poll([{fd=5, events=POLLOUT|POLLWRNORM}], 1, 0) = 1 ([{fd=5, revents=POLLOUT|POLLWRNORM}])
17.934970 getsockopt(5, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
17.934988 getpeername(5, {sa_family=AF_INET, sin_port=htons(37034), sin_addr=inet_addr("127.0.0.1")}, [16]) = 0
17.935006 getsockname(5, {sa_family=AF_INET, sin_port=htons(46830), sin_addr=inet_addr("127.0.0.1")}, [16]) = 0
17.935024 sendto(5, "POST /foo/1/bar HTTP/"..., 168, MSG_NOSIGNAL, NULL, 0) = 168
17.935042 poll([{fd=5, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0 (Timeout)
17.935060 poll([{fd=5, events=POLLIN}], 1, 1) = 0 (Timeout)
17.935078 poll([{fd=5, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0 (Timeout)
18.029421 poll([{fd=5, events=POLLIN}], 1, 98) = 0 (Timeout)
18.029518 poll([{fd=5, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0 (Timeout)
18.030576 poll([{fd=5, events=POLLIN}], 1, 1) = 0 (Timeout)
18.030681 poll([{fd=5, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0 (Timeout)
18.931571 poll([{fd=5, events=POLLIN}], 1, 900) = 0 (Timeout)
18.931642 poll([{fd=5, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0 (Timeout)
18.931698 poll([{fd=5, events=POLLIN}, {fd=5, events=POLLOUT}], 2, 1000) = 1 ([{fd=5, revents=POLLOUT}])
18.931726 poll([{fd=5, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=5, events=POLLOUT|POLLWRNORM}], 2, 0) = 1 ([{fd=5, revents=POLLOUT|POLLWRNORM}])
18.931842 sendto(5, "{\"foo\":[{\"bar\":\"A\",\"e"..., 1642, MSG_NOSIGNAL, NULL, 0) = 1642
curl
我在使用命令行和使用 时都遇到了同样的问题curl_easy_perform
,但是使用 Postman 等不同的 REST 客户端没有问题。