July 01, 2008

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
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真的不错,ubuntu源中就有:

$ aptitude show httping
Package: httping
State: not installed
Version: 1.2.5-1
Priority: optional
Section: universe/net
Maintainer: Ubuntu MOTU Developers
Uncompressed Size: 81.9k
Depends: libc6 (>= 2.6.1-1), libssl0.9.8 (>= 0.9.8e-1), openssl
Replaces: httping-nossl
Description: ping-like program for http-requests
httping show you how long it takes to connect to a hostname or remote url; send
a request and retrieve the reply (only the headers).

Homepage: http://www.vanheusden.com/httping

Fwolf 發表於 July 1, 2008 01:47 PM
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