random_chain: keep iterating through the list on proxy error

hi,

I happen to use high traffic proxies that work intermittently. When the proxy cannot provide me with the requested resource, it returns a 97 error with curl. With proxychains, it says "[proxychains] Random chain "socket error or timeout!" and it does not try to contact anyone else proxy from my list, unlike unresponsive proxies.

I think it would be better if proxychains doesn't stop on an error proxy, but continues selecting other proxy, like when the proxy times out.

What do you think ?

thanks!

Here is the configuration I use:
random_chain
chain_len = 1

tcp_read_time_out 15000
tcp_connect_time_out 8000

[ProxyList]

socks4 ip1 port1
socks4 ip2 port2
socks4 ip3 port3

:~ $ curl -vvvvvv --socks4 x.x.x.x:yyyy ipinfo.io

• Trying x.x.x.x:yyyy...
• SOCKS4 communication to ipinfo.io:80
• SOCKS4 non-blocking resolve of ipinfo.io
• SOCKS4 connect to IPv4 34.117.59.81 (locally resolved)
• connection to proxy closed
• Closing connection 0
  curl: (97) connection to proxy closed

$ proxychains4 -f /etc/proxychains4.conf curl http://ipinfo.io
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
[proxychains] DLL init: proxychains-ng 4.16
[proxychains] Random chain ... x.x.x.x:yyyy ... 34.117.59.81:80 <--socket error or timeout!
curl: (7) Couldn't connect to server

Reproduce the reported behavior with proxychains4 and the shown random_chain configuration, using proxies that close the connection and proxies that time out. Trace how random_chain handles a socket error, then make completion mean that another proxy is selected instead of stopping; verify that the command proceeds through the proxy list.