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Full Discussion: How to send a Head Http request from command line
Top Forums UNIX for Dummies Questions & Answers How to send a Head Http request from command line Post 302181383 by cbkihong on Wednesday 2nd of April 2008 10:20:15 PM
Old 04-02-2008
If you don't mind installing a Perl module Net::HTTP, you can do that very easily. The write_request() does not return until a response can be received.

Code:
$ time perl -MNet::HTTP -e '$h = Net::HTTP->new(Host => "www.sun.com"); $h->write_request(HEAD => "/")'

real    0m2.746s
user    0m0.072s
sys     0m0.012s

The corresponding packet dump to show a HEAD request was actually sent:

Code:
[root@bernardchan ~]# tcpdump -s 0 -A -i eth0 tcp and port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
10:15:30.925197 IP bernardchan.41865 > 72.5.124.61.http: S 2605374828:2605374828(0) win 5840 <mss 1460,sackOK,timestamp 482811 0,nop,wscale 2>
E..<..@.@.*|..
.H.|=...P.J.l........&..........
..].........
10:15:31.120470 IP 72.5.124.61.http > bernardchan.41865: S 3988518783:3988518783(0) ack 2605374829 win 33304 <nop,nop,timestamp 1576677510 482811,mss 1460,nop,wscale 0,nop,nop,sackOK>
E..@.=@.1...H.|=..
..P.......J.m....5......
].0...].............
10:15:31.120547 IP bernardchan.41865 > 72.5.124.61.http: . ack 1 win 1460 <nop,nop,timestamp 482860 1576677510>
E..4..@.@.*...
.H.|=...P.J.m...............
..^,].0.
10:15:31.121101 IP bernardchan.41865 > 72.5.124.61.http: P 1:58(57) ack 1 win 1460 <nop,nop,timestamp 482860 1576677510>
E..m..@.@.*I..
.H.|=...P.J.m...............
..^,].0.HEAD / HTTP/1.1
Connection: close
Host: www.sun.com


10:15:31.121423 IP bernardchan.41865 > 72.5.124.61.http: F 58:58(0) ack 1 win 1460 <nop,nop,timestamp 482860 1576677510>
E..4..@.@.*...
.H.|=...P.J.................
..^,].0.
10:15:31.315358 IP 72.5.124.61.http > bernardchan.41865: . ack 58 win 33304 <nop,nop,timestamp 1576677530 482860>
E..4.>@.1...H.|=..
..P.......J......v,.....
].0...^,
10:15:31.315474 IP 72.5.124.61.http > bernardchan.41865: . ack 59 win 33304 <nop,nop,timestamp 1576677530 482860>
E..4.?@.1...H.|=..
..P.......J......v+.....
].0...^,
10:15:31.345593 IP 72.5.124.61.http > bernardchan.41865: F 517:517(0) ack 59 win 33304 <nop,nop,timestamp 1576677533 482860>
E..4.A@.1...H.|=..
..P.......J......t#.....
].0...^,
10:15:31.345644 IP bernardchan.41865 > 72.5.124.61.http: R 2605374887:2605374887(0) win 0
E..(..@.@.....
.H.|=...P.J......P....l..
10:15:31.348082 IP 72.5.124.61.http > bernardchan.41865: P 1:517(516) ack 59 win 33304 <nop,nop,timestamp 1576677533 482860>
E..8.@@.1...H.|=..
..P.......J.............
].0...^,HTTP/1.1 200 OK
Server: Sun-Java-System-Web-Server/6.1
Date: Thu, 03 Apr 2008 02:15:32 GMT
Content-type: text/html;charset=UTF-8
P3p: policyref="http://www.sun.com/p3p/Sun_P3P_Policy.xml", CP="CAO DSP COR CUR ADMa DEVa TAIa PSAa PSDa CONi TELi OUR  SAMi PUBi IND PHY ONL PUR COM NAV INT DEM CNT STA POL PRE GOV"
X-powered-by: Servlet/2.4,JSP/2.0
Connection: close
Set-cookie: Starload=star-fep5; Path=/
Set-cookie: JSESSIONID=12112cc14aabcdfffffffffe2641a9e183505; Path=/
Set-cookie: JROUTE=Pe4Y; Path=/


10:15:31.348114 IP bernardchan.41865 > 72.5.124.61.http: R 2605374887:2605374887(0) win 0
E..(..@.@.....
.H.|=...P.J......P....l..

 

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LEARN ABOUT REDHAT

head

HEAD(1) 								FSF								   HEAD(1)

NAME

       head - output the first part of files

SYNOPSIS

       head [OPTION]... [FILE]...

DESCRIPTION

       Print  first  10 lines of each FILE to standard output.	With more than one FILE, precede each with a header giving the file name.  With no
       FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --bytes=SIZE
	      print first SIZE bytes

       -n, --lines=NUMBER
	      print first NUMBER lines instead of first 10

       -q, --quiet, --silent
	      never print headers giving file names

       -v, --verbose
	      always print headers giving file names

       --help display this help and exit

       --version
	      output version information and exit

       SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.

AUTHOR

       Written by David MacKenzie.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for head is maintained as a Texinfo manual.  If the info and head programs are properly installed at your site, the
       command

	      info head

       should give you access to the complete manual.

head (coreutils) 4.5.3						   February 2003							   HEAD(1)
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