获取TTFB(直到第一个字节的时间)以获取HTTP请求 [英] Getting TTFB (time till first byte) for an HTTP Request

问题描述

这是一个加载网址并捕获响应时间的python脚本:

Here is a python script that loads a url and captures response time:

import urllib2
import time

opener = urllib2.build_opener()
request = urllib2.Request('http://example.com')

start = time.time()
resp = opener.open(request)
resp.read()
ttlb = time.time() - start

由于我的计时器环绕着整个请求/响应(包括read())，所以这将给我TTLB(到最后一个字节的时间).

Since my timer is wrapped around the whole request/response (including read()), this will give me the TTLB (time to last byte).

我也想获取TTFB(到第一个字节的时间)，但不确定从哪里开始/停止我的计时. urllib2是否足够我添加TTFB计时器?如果是这样，他们会去哪里?

I would also like to get the TTFB (time to first byte), but am not sure where to start/stop my timing. Is urllib2 granular enough for me to add TTFB timers? If so, where would they go?

推荐答案

您应该使用pycurl，而不是urllib2

1. 安装pyCurl:
   您可以使用pip/easy_install，也可以从源代码进行安装.

1. install pyCurl:
   you can use pip / easy_install, or install it from source.

easy_install pyCurl

easy_install pyCurl

也许您应该是超级用户.

maybe you should be a superuser.

用法:

import pycurl
import sys 
import json

WEB_SITES = sys.argv[1]

def main():
    c = pycurl.Curl()
    c.setopt(pycurl.URL, WEB_SITES)              #set url
    c.setopt(pycurl.FOLLOWLOCATION, 1)  
    content = c.perform()                        #execute 
    dns_time = c.getinfo(pycurl.NAMELOOKUP_TIME) #DNS time
    conn_time = c.getinfo(pycurl.CONNECT_TIME)   #TCP/IP 3-way handshaking time
    starttransfer_time = c.getinfo(pycurl.STARTTRANSFER_TIME)  #time-to-first-byte time
    total_time = c.getinfo(pycurl.TOTAL_TIME)  #last requst time
    c.close()

    data = json.dumps({'dns_time':dns_time,         
                       'conn_time':conn_time,        
                       'starttransfer_time':starttransfer_time,    
                       'total_time':total_time})
    return data

if __name__ == "__main__":    
    print main()

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