Why does my HTTP response using Python Sockets fail?

Question

Code:

from socket import *
sP = 14000
servSock = socket(AF_INET,SOCK_STREAM)
servSock.bind(('',sP))
servSock.listen(1)

while 1:
  connSock, addr = servSock.accept()
  connSock.send('HTTP/1.0 200 OK\nContent-Type:text/html\nConnection:close\n<html>...</html>')
connSock.close()

When I go to the browser and type in localhost:14000, I get an error 101- ERR_CONNECTION_RESET The connection was reset? Not sure why! What am I doing wrong

You need a \n on an empty line before the response body. So ...Connection:close\n\n<html>... — Ian Wetherbee
– Ian Wetherbee, Commented Apr 12, 2012 at 5:23
Change all '\n' to '\r\n', and have an empty line after the header. And read the RFC. — Some programmer dude
– Some programmer dude, Commented Apr 12, 2012 at 5:32

torek · Accepted Answer · 2012-04-12 05:27:31Z

2

Several bugs, some more severe than others ... as @IanWetherbee already noted, you need an empty line before the body. You also should send \r\n not just \n. You should use sendall to avoid short sends. Last, you need to close the connection once you're done sending.

Here's a slightly modified version of the above:

from socket import *
sP = 14000
servSock = socket(AF_INET,SOCK_STREAM)
servSock.bind(('',sP))
servSock.listen(1)

while 1:
  connSock, addr = servSock.accept()
  connSock.sendall('HTTP/1.0 200 OK\r\nContent-Type:text/html\r\nConnection:close\r\n\r\n<html><head>foo</head></html>\r\n')
  connSock.close()

answered Apr 12, 2012 at 5:27

torek

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Adam Lewis · Accepted Answer · 2012-04-12 05:27:12Z

Running your code, I have similar errors and am unsure on their origins too. However, rather than rolling your own HTTP server, have you considered a built in one? Check out the sample below. This can also support POST as well (have to add the do_POST method).

Simple HTTP Server

from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler

class customHTTPServer(BaseHTTPRequestHandler):
        def do_GET(self):
                self.send_response(200)
                self.send_header('Content-type', 'text/html')
                self.end_headers()
                self.wfile.write('<HTML><body>Hello World!</body></HTML>')
                return 

def main():
        try:
                server = HTTPServer(('',14000),customHTTPServer)
                print 'server started at port 14000'
                server.serve_forever()
        except KeyboardInterrupt:
                server.socket.close() 

if __name__=='__main__':
    main()

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