python socket向百度发送http长连接请求 并做搜索

#coding=gbk

'''

socket 给百度发送http请求

连接成功后，发送http的get请求，所搜索功能

'''

import socket

import sys

import time

if __name__=='__main__':

    #创建套接字

    try :

        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    except socket.eorror,e:

        print 'socket false:%s'%e

    print 'socket ...'

  

    #连接百度ip

    try :

        sock.connect(('220.181.111.148',80))

    except socket.error,e:

        print 'connect false %s'%e

        sock.close()

    print 'connect ...'

  

    #发送百度首页面请求并且保持连接

    try :

        print 'send start...'

        str='GET / HTTP/1.1\r\nHost:www.baidu.com\r\nConnection:keep-alive\r\n\r\n'

        sock.send(str)

    except socket.eorror,e:

        print 'send false'

        sock.close()

  

    data=''

    data = sock.recv(1024)

    while (1):       '''如何判断数据接收完毕，在发送http 最前端,

                        包含发送数据文件大小属性Content-Length，

                        用字符匹配方式取得文件大小,

                        同过大小判断是否接收完毕。

                        '''

        print data

        beg = data.find('Content-Length:',0,len(data))

        end = data.find('Content-Type:',0,len(data))

        print beg

        print end

        if(beg == end):

            print 'connecting closed'

            break

        num = long(data[beg+16:end-2])

        print num

        nums = 0

        while (1):

            data=sock.recv(1024)

            print data

            nums +=len(data)

            if(nums >= num):

                break

        word = raw_input('please input your word----->')

        str='''GET /s?wd=''' + word + ''' HTTP/1.1

Host:www.baidu.com

Connection: Keep-Alive

'''

        print str

        sock.send(str)

        data = ''

        data = sock.recv(1024)  

    sock.close()

    print data