Hi,
if something writes to an already closed socket, it triggers a SIGPIPE
in the default settings, which kills the program.
On Linux, the MSG_NOSIGNAL flag needs to be set on each write and then
the SIGPIPE is not triggered. Synapse seems to set that flag on every
write, so HTTP has always worked well for me. And its default setting
uses HTTP1.0, where Synapse closes the connection immediately before the
server can close it.
However, OpenSSL does not seem to set the flag for write, so HTTPS 1.1
crashes whenever the server closes the connection.
For example, this program crashes:
uses sysutils,httpsend,ssl_openssl,ssl_openssl_lib;
var
h: THTTPSend;
begin
h := THTTPSend.Create;
h.Protocol:='1.1';
writeln('a');
h.HTTPMethod('GET', 'https://www.voebb.de');
writeln('b');
Sleep(6*60*1000);
writeln('c');
h.HTTPMethod('GET', 'https://www.voebb.de');
writeln('d');
end.
How can this be fixed without a global signal handler?
Cheers,
Benito
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