Hi, our client app will failed to connect to the server through https_proxy
when I use libcurl 7.39 in our client app, the libcurl 7.32 doesnt' have the
issue, could you please take look into it? Look like the root cause is that the
timer of curl could time out over the certain proxy and subsequently
CURL_SOCKET_TIMEOUT would be sent to curl so that the underlying socket would
be closed by curl resulting in the connection being failed, which works fine
using curl 7.32.I spotted the below code of file “multi.c” in curl 7.32 was
removed but with “memset(&multi->timer_lastcall, 0,
sizeof(multi->timer_lastcall));” instead in curl 7.39, which might be the
partial reason. Could you help look into it? /* Compensate for bad precision
timers that might've triggered too early. This precaution was added in
commit 2c72732ebf3da5e as a result of bad
resolution in the windows function use(d).
The problematic case here is when using the multi_socket API and libcurl
has told the application about a timeout, and that timeout is what fires
off a bit early. As we don't have any IDs associated with the timeout we
can't tell which timeout that fired off but we only have the times to use
to check what to do. If it fires off too early, we don't run the correct
actions and we don't tell the application again about the same timeout as
was already first in the queue...
Originally we made the timeouts run 40 milliseconds early on all systems,
but now we have an #ifdef setup to provide a decent precaution inaccuracy
margin. */ now.tv_usec += TIMEOUT_INACCURACY; if(now.tv_usec >=
1000000) { now.tv_sec++;
now.tv_usec -= 1000000;
}2 potential workarounds on app side rather than libcurl are:
(1) If timeout happens, never send CURL_SOCKET_TIMEOUT to curl;(2)
Don’t register CURLMOPT_TIMERFUNCTION callback; Or Never register curl timers.
As normally our Client only has one connection at one time, could you please
check the feasibility of these workarounds?
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