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From Geoffrey Young <ge...@modperlcookbook.org>
Subject Re: Apache::Registry HEAD request also return document body
Date Sun, 06 Jun 2004 08:32:56 GMT

>>>[And although it's considered harmless there, it is actually causing
>>>data corruption with Mozilla, see
>>>http://bugzilla.mozilla.org/show_bug.cgi?id=245447 if you're interested.]
>>
>>wow, a HEAD request in the wild.  nice.
> 
> 
> Just for general information, mozilla (and browsers based upon it)
> always do a HEAD before a GET if the user does a right-mouse-click
> menu "Save Link Target As..." or does a "Save Page As...". This
> recently caused me headaches with some of my mod_perl scripts that
> were returning broken responses to the HEAD request. 

along the same lines, I would think this is really a bug on both sides, and
that the INVALID status of that bug report is wrong.

certainly servers should be producing the proper response to a HEAD request,
 but clients should be more intelligent about things as well in the - HEAD
requests are often mis-implemented, either with minor differences like the
headers not really matching an identical GET request (very common), or just
simply making GET and HEAD equivalent (like Registry mistakenly does in
mp1).  and it's not just little guys who are getting it wrong either:

$ telnet www.yahoo.com 80
Trying 216.109.117.207...
Connected to www.yahoo.com (216.109.117.207).
Escape character is '^]'.
HEAD / HTTP/1.1
host: www.yahoo.com

HTTP/1.1 200 OK
Date: Sun, 06 Jun 2004 08:15:39 GMT
P3P: policyref="http://p3p.yahoo.com/w3c/p3p.xml", CP="CAO DSP COR CUR ADM
DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi OUR DELi SAMi OTRi UNRi PUBi IND
PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE GOV"
Cache-Control: private
Vary: User-Agent
Connection: close
Content-Type: text/html

<html><head>

<title>Yahoo!</title>...


--Geoff

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