Jserv's blog: httping : 針對 HTTP Request 的仿 ping 程式
Published by knick,
httping : 針對 HTTP Request 的仿 ping 程式
[httping ] 這個程式非常有意思，能夠以類似 ping 工具程式的方式，將 HTTP Request 的回應情況，呈現給操作者，簡介如下： Give it an url, and it'll show you how long it takes to connect, send a request and retrieve the reply (only the headers). Be aware that the transmission across the network also takes time! 跑個實際的例子，對象用 Google：
$ httping -g http://www.google.com -c 5 PING www.google.com:80 (http://www.google.com): connected to www.google.com:80, seq=0 time=641.30 ms connected to www.google.com:80, seq=1 time=672.34 ms connected to www.google.com:80, seq=2 time=692.74 ms connected to www.google.com:80, seq=3 time=660.11 ms connected to www.google.com:80, seq=4 time=654.99 ms --- http://www.google.com ping statistics --- 5 connects, 5 ok, 0.00% failed round-trip min/avg/max = 641.3/664.3/692.7 ms
由上可見，對著 Google 的某幾台機器的 port 80 作 HTTP request，並等待 header 的回應情況，我們可比對 ping 工具程式的輸出：
$ ping www.google.com -c 5 PING www.l.google.com (74.125.19.104) 56(84) bytes of data. 64 bytes from cf-in-f104.google.com (74.125.19.104): icmp_seq=1 ttl=241 time=258 ms 64 bytes from cf-in-f104.google.com (74.125.19.104): icmp_seq=2 ttl=241 time=258 ms 64 bytes from cf-in-f104.google.com (74.125.19.104): icmp_seq=3 ttl=241 time=257 ms 64 bytes from cf-in-f104.google.com (74.125.19.104): icmp_seq=4 ttl=241 time=257 ms --- www.l.google.com ping statistics --- 5 packets transmitted, 4 received, 20% packet loss, time 4019ms rtt min/avg/max/mdev = 257.860/258.053/258.395/0.656 ms
另外，[httping ] 支援 https (使用 OpenSSL 函式庫)，也可以要求只做一次 DNS resolve，對於 roundrobin DNS 的環境來說很重要。
由 jserv 發表於 July 1, 2008 11:11 AM
真的不错，ubuntu源中就有：