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I wonder whether this is a bug for python urllib2. The following is the code I used: target = protocol + "://" + location + directory + target_file start = datetime.now() try: urlrequest = urllib2.Request(target) urlresponse = urllib2.urlopen(urlrequest, timeout=4) urldata = urlresponse.read() except (urllib2.URLError, socket.timeout): return "ERR" stop = datetime.now() time_difference = stop - start print("\ntime diff is " + str(time_difference.total_seconds())) According to the definition of socket.timeout, time_difference will be no more than 4 seconds or no part of output. However, when I print the variable: time_difference.total_seconds() , I found that the result commonly is greater than 4 seconds. I put my detailed code at the Bitbucket: https://bitbucket.org/mudongliang/apt-spy-python/branch/timecheck And the code is in the file : apt-spy The following is the part of my output: mdl@NjuMdl:~/Repos/Bitbucket/apt-spy-python$ sudo ./apt-spy -d testing -c CN --http-only Benchmarking 8 debian-mirrors: Mirrorname | HTTP Speed => checking ftp.cn.debian.org (http) ... time diff is 14.435451 ftp.cn.debian.org | 775.0 kB/s => checking www.anheng.com.cn (http) ... time diff is 95.854271 www.anheng.com.cn | 116.7 kB/s => checking mirrors.163.com (http) ... time diff is 29.687312 mirrors.163.com | 376.7 kB/s => checking debian.bjtu.edu.cn (http) ... time diff is 3.926047 debian.bjtu.edu.cn | 2.8 MB/s => checking debian.ustc.edu.cn (http) ... time diff is 13.976661 debian.ustc.edu.cn | 800.4 kB/s => checking mirrors.sohu.com (http) ... time diff is 30.373006 mirrors.sohu.com | 368.1 kB/s => checking mirrors.tuna.tsinghua.edu.cn (http) ... time diff is 4.545543 mirrors.tuna.tsinghua.edu.cn | 2.5 MB/s mirrors.hust.edu.cn | ERR Mirror with highest throughput: debian.bjtu.edu.cn |