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Re: PHP Runs In WinXP Command Window But Not In Browser [message #173587 is a reply to message #173585]

Tue, 19 April 2011 21:19

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

Denis McMahon wrote:
> On Tue, 19 Apr 2011 18:46:01 +0100, The Natural Philosopher wrote:
>
>> William Gill wrote:
>
>>> When a user types peter.example.com into his browser, the browser says
>>> "???" ; then asks one of the root servers (who maintain a list of all
>>> the building directories for the ".com" part of peter.example.com
>>> "where do I begin?"; the root server says "Ask Peter's hosting company
>>> at xxx.xxx.xxx.xxx"
>
>> No. The browser does NOT do that. The browser sends a request to
>> whatever DNS server its configured to look up and the DNS server does
>> all that, and relays the answer back
>
> WRONG. The browser asks the local resolver, which is usually a process
> running on the same system. The local resolver then does the lookup
> according to it's configuration and settings (which may be defined by dhcp
> settings, or may be statically configured) and returns an answer to the
> browser.
>
WRONG.

The 'resolver is normally a library that is either DLL or statically
linked to the browser.

The resolver knows nothing about root level domains.

Unless you are runing locale DNS server like BIND the resolver at best
knows a where a DNS server it can query exists.

If every resolver on the planet asked the root servers where to go,
they would die in milliseconds.

Fortunately DNS is a cacheing hierachical system. So they very seldom do.

>> And peter, remember that people who assure you they knwo what they are
>> talking about may in fact not know any more than you do..:-)
>
> You certainly proved that one today.

And you have doubly assured ebveryone of it.

Wiki says it esier than typing it in

Client lookup
DNS resolution sequence

Users generally do not communicate directly with a DNS resolver. Instead
DNS resolution takes place transparently in applications programs such
as web browsers, e-mail clients, and other Internet applications. When
an application makes a request that requires a domain name lookup, such
programs send a resolution request to the DNS resolver in the local
operating system, which in turn handles the communications required.

The DNS resolver will almost invariably have a cache (see above)
containing recent lookups. If the cache can provide the answer to the
request, the resolver will return the value in the cache to the program
that made the request. If the cache does not contain the answer, *the
resolver will send the request to one or more designated DNS servers. In
the case of most home users, the Internet service provider to which the
machine connects will usually supply this DNS server: such a user will
either have configured that server's address manually or allowed DHCP to
set it*; however, where systems administrators have configured systems
to use their own DNS servers, their DNS resolvers point to separately
maintained nameservers of the organization. In any event, the name
server thus queried will follow the process outlined above, until it
either successfully finds a result or does not. It then returns its
results to the DNS resolver; assuming it has found a result, the
resolver duly caches that result for future use, and hands the result
back to the software which initiated the request.

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[Message index]

		PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Sun, 03 April 2011 11:54
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Luuk on Sun, 03 April 2011 12:03
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 04 April 2011 01:36
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Mon, 04 April 2011 01:54
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Mon, 04 April 2011 09:41
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 06 April 2011 20:36
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 06 April 2011 21:14
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 07 April 2011 03:54
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Thu, 07 April 2011 08:08
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Wed, 06 April 2011 21:21
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 07 April 2011 04:00
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Thu, 07 April 2011 09:28
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 08 April 2011 02:53
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Fri, 08 April 2011 12:04
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 08 April 2011 17:45
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Fri, 08 April 2011 18:01
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 08 April 2011 23:45
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 08 April 2011 23:55
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Sat, 09 April 2011 00:02
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 03:07
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Wed, 13 April 2011 09:23
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 17:59
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 13 April 2011 18:33
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 18:29
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Michael Fesser on Wed, 13 April 2011 18:36
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 21:08
		Re: PHP Runs In WinXP Command Window But Not In Browser By: P E Schoen on Tue, 19 April 2011 05:31
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 28 April 2011 15:17
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Wed, 13 April 2011 10:46
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 16:05
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Mon, 18 April 2011 17:22
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 21:35
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Tue, 19 April 2011 09:15
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 28 April 2011 18:05
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Sat, 09 April 2011 00:57
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Sat, 09 April 2011 02:49
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 03:31
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Wed, 13 April 2011 10:58
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 13 April 2011 12:23
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Wed, 13 April 2011 12:29
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 16:44
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Mon, 18 April 2011 17:25
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 21:37
		Re: PHP Runs In WinXP Command Window But Not In Browser By: James Carlock on Mon, 18 April 2011 23:07
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Tue, 19 April 2011 00:14
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Tue, 19 April 2011 03:05
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Tue, 19 April 2011 10:03
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Tue, 19 April 2011 11:50
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Tue, 19 April 2011 23:52
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Wed, 20 April 2011 02:00
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Wed, 20 April 2011 02:12
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Wed, 20 April 2011 02:27
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Wed, 20 April 2011 02:58
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Wed, 20 April 2011 03:56
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Wed, 20 April 2011 04:11
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Wed, 20 April 2011 09:20
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Mr. B-o-B on Wed, 20 April 2011 12:27
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 20 April 2011 15:44
		Re: PHP Runs In WinXP Command Window But Not In Browser By: The Natural Philosoph on Wed, 20 April 2011 16:16
		Re: PHP Runs In WinXP Command Window But Not In Browser By: The Natural Philosoph on Wed, 20 April 2011 10:30
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 20 April 2011 01:59
		Re: PHP Runs In WinXP Command Window But Not In Browser By: James Carlock on Sun, 24 April 2011 13:23
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 29 April 2011 19:45
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 29 April 2011 19:46
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Sat, 09 April 2011 08:29
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 03:33
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Wed, 13 April 2011 09:25
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Wed, 13 April 2011 11:00
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 13 April 2011 12:43
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Wed, 13 April 2011 14:17
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 18:16
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Wed, 13 April 2011 19:12
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Thu, 14 April 2011 10:37
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Thu, 14 April 2011 12:53
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Thu, 14 April 2011 18:47
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 21:10
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Wed, 13 April 2011 20:57
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 21:22
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Tue, 19 April 2011 09:42
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Michael Fesser on Sat, 09 April 2011 10:26
		Re: PHP Runs In WinXP Command Window But Not In Browser By: The Natural Philosoph on Sat, 09 April 2011 11:10
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Sat, 09 April 2011 16:09
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 03:43
		Re: PHP Runs In WinXP Command Window But Not In Browser By: William Gill on Wed, 13 April 2011 19:13
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 13 April 2011 19:21
		Re: PHP Runs In WinXP Command Window But Not In Browser By: William Gill on Wed, 13 April 2011 23:22
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Thu, 14 April 2011 09:10
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 03:43
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Wed, 13 April 2011 11:08
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 03:57
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 13 April 2011 12:20
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 16:19
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Tue, 19 April 2011 09:42
		Re: PHP Runs In WinXP Command Window But Not In Browser By: William Gill on Tue, 19 April 2011 14:36
		Re: PHP Runs In WinXP Command Window But Not In Browser By: The Natural Philosoph on Tue, 19 April 2011 17:46
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Tue, 19 April 2011 20:32
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Tue, 19 April 2011 20:35
		Re: PHP Runs In WinXP Command Window But Not In Browser By: The Natural Philosoph on Tue, 19 April 2011 21:19
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Tue, 19 April 2011 23:52
		Re: PHP Runs In WinXP Command Window But Not In Browser By: William Gill on Wed, 20 April 2011 02:15
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 28 April 2011 19:18
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Thu, 07 April 2011 09:19
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Mon, 04 April 2011 08:53
		Re: PHP runs in WinXP command window but not in browser By: Tim Streater on Sun, 03 April 2011 12:39
		Re: PHP runs in WinXP command window but not in browser By: Peter Lauren on Mon, 04 April 2011 01:42
		Re: PHP runs in WinXP command window but not in browser By: Jerry Stuckle on Mon, 04 April 2011 01:55
		Re: PHP runs in WinXP command window but not in browser By: crankypuss on Mon, 04 April 2011 09:48
		Re: PHP runs in WinXP command window but not in browser By: Peter Lauren on Wed, 06 April 2011 20:43
		Re: PHP runs in WinXP command window but not in browser By: Peter H. Coffin on Mon, 04 April 2011 22:31
		Re: PHP runs in WinXP command window but not in browser By: Peter Lauren on Thu, 07 April 2011 03:40
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Mon, 04 April 2011 17:19
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jim Higgins on Tue, 05 April 2011 18:36
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Tue, 05 April 2011 20:07
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Tue, 05 April 2011 22:01
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Tue, 05 April 2011 23:27
		Re: PHP Runs In WinXP Command Window But Not In Browser By: William Gill on Wed, 13 April 2011 16:14
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 07 April 2011 03:18
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 07 April 2011 03:19
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Thu, 07 April 2011 13:16
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Thu, 07 April 2011 14:09
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 08 April 2011 17:33
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Jerry Stuckle on Fri, 08 April 2011 18:00
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 08 April 2011 17:34
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Fri, 08 April 2011 18:17
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Fri, 08 April 2011 17:53
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Denis McMahon on Fri, 08 April 2011 18:30
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Wed, 13 April 2011 03:06
		Re: PHP Runs In WinXP Command Window But Not In Browser By: crankypuss on Wed, 13 April 2011 11:11
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Tim Streater on Wed, 13 April 2011 12:25
		Re: PHP Runs In WinXP Command Window But Not In Browser By: William Gill on Wed, 13 April 2011 17:46
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Mon, 18 April 2011 18:27
		Re: PHP Runs In WinXP Command Window But Not In Browser By: William Gill on Mon, 18 April 2011 23:15
		Re: PHP Runs In WinXP Command Window But Not In Browser By: Peter Lauren on Thu, 28 April 2011 15:12

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