scapy script to send http requests

gistfile1.txt

#!/usr/bin/env python

"""
Script to open TCP connection and send 1 HTTP GET request containing
a specific string, and header

Usage:
./http.py <IP_of_target>

There is only one mandatory argument, which is the target IP address.
If other arguments are omitted, will send a preconfigured URL string 
10 times

Optional arguments are : 
./http.py <IP_of_target> |HTTP GET STRING| |Max requests|

e.g.
./http.py 10.10.10.10 'GET / HTTP/1.1\r\n' 100

 """
from scapy.all import *
import random
import sys

dest = sys.argv[1]
try:
    if sys.argv[2]:
        getStr = sys.argv[2]
except :
    getStr = 'GET / HTTP/1.1\r\nHost:' + dest + '\r\nAccept-Encoding: gzip, deflate\r\n\r\n'

try:
    if sys.argv[3]:
        max = int(sys.arv[3])

except:
    max = 10

counter = 0
while counter < max:
    #SEND SYN
    syn = IP(dst=dest) / TCP(sport=random.randint(1025,65500), dport=80, flags='S')
    #GET SYNACK
    syn_ack = sr1(syn)
    #Send ACK
    out_ack = send(IP(dst=dest) / TCP(dport=80, sport=syn_ack[TCP].dport,seq=syn_ack[TCP].ack, ack=syn_ack[TCP].seq + 1, flags='A'))
    #Send the HTTP GET
    sr1(IP(dst=dest) / TCP(dport=80, sport=syn_ack[TCP].dport,seq=syn_ack[TCP].ack, ack=syn_ack[TCP].seq + 1, flags='P''A') / getStr)
    counter += 1

Hey, I have problem getting this to work
when I run this it gets stuck in the first request taking for ever

Begin emission:
Finished sending 1 packets.
....*
Received 5 packets, got 1 answers, remaining 0 packets
.
Sent 1 packets.
Begin emission:
Finished sending 1 packets.
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

anything I'm doing wrong?