Hi,
Environment:
CentOS 7
libcurl 7.54 compiled with OpenSSL
I am observing strange behavior -- when server's TCP backlog is overflowing
I naturally start getting curl code 7. But I also get curl code 35 and (as
time goes by) they become more and more prevalent (after 1-2 hours). It
looks like a bug to me -- I shouldn't get anything TLS-specific until TCP
connection is established. Sufficiently increasing server's TCP backlog
size makes both problems to go away. Is it normal?
Client app has ~30-60 threads each performing more or less the same
operation in a loop (with some delay in-between):
curl_easy_init()
configure handle to send a POST request to https endpoint
curl_easy_perform()
curl_easy_cleanup() -- I know it is inefficient
Code for server (it is a mockup), if your certificate has private key in
the same file -- keyfile param is not required:
#!/usr/bin/python
import time
import BaseHTTPServer
import urlparse
import ssl
HOST_NAME = '<hostname>' # !!!REMEMBER TO CHANGE THIS!!!
PORT_NUMBER = 9000 # Maybe set this to 9000.
class MyHandler(BaseHTTPServer.BaseHTTPRequestHandler):
def do_HEAD(s):
s.send_response(200)
s.send_header("Content-type", "text/html")
s.end_headers()
def do_GET(s):
"""Respond to a GET request."""
s.send_response(200)
s.send_header("Content-type", "text/html")
s.end_headers()
s.wfile.write("<html><head><title>Title goes here.</title></head>")
s.wfile.write("<body><p>This is a test.</p>")
# If someone went to "http://something.somewhere.net/foo/bar/";,
# then s.path equals "/foo/bar/".
s.wfile.write("<p>You accessed path: %s</p>" % s.path)
s.wfile.write("</body></html>")
def do_POST(s):
"""Respond to a POST request."""
# Handle Expect: header
if s.headers.get('Expect') == '100-continue':
s.send_response(100)
s.end_headers()
# Extract and print the contents of the POST
length = int(s.headers['Content-Length'])
post_data = urlparse.parse_qs(s.rfile.read(length).decode('utf-8'))
for key, value in post_data.iteritems():
print "%s=%s" % (key, value)
print s.headers
s.send_response(201)
s.send_header("Content-Length", 0) # WinSSL demands this
s.end_headers()
class MyServer(BaseHTTPServer.HTTPServer):
def server_activate(self):
self.socket.listen(128) # set it to 5 to reproduce
if __name__ == '__main__':
httpd = MyServer((HOST_NAME, PORT_NUMBER), MyHandler)
httpd.socket = ssl.wrap_socket (httpd.socket, certfile='./server.pem',
keyfile='./private.key', server_side=True)
print time.asctime(), "Server Starts - %s:%s" % (HOST_NAME, PORT_NUMBER)
try:
httpd.serve_forever()
except KeyboardInterrupt:
pass
httpd.server_close()
print time.asctime(), "Server Stops - %s:%s" % (HOST_NAME, PORT_NUMBER)
--
Regards,
Michael.
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