Is there someone 'up' on the way Apache works who can offer some comment please?
Th "how do I display 'please wait' " question was asked by someone (else) last week.
The standard answer is
"no" - server-side PHP assembles an HTML page, and when it is completed the whole page
is transmitted from the
web server to the browser. However is this strictly true?
I managed to do something warned about in lesson two of ComSc 101, and put my PHP into
a never-ending loop (hey,
after all these years, it's just to keep me humble...). What was happening was that a
database record would be
read in, a whole pile of debug 'echo's sent to the screen to demonstrate the
processing, then the next record,
and so on... the governor/loop limit code failed and was stuck on 'true' so while true
What I saw on the screen - particularly the behavior of the scroll bars, was that a
certain amount of data
(let's call it a 'buffer') was produced within Apache, and then it would be sent to
the screen, then there would
be a short pause, then another 'buffer' load would be displayed in the browser, then a
pause... This behavior
similar to response from a long-distance www link or taking stuff down a slow dial-up
line from an overloaded
server; BUT everything on my machine is local !
Does this mean that Apache retains a certain amount of the page internally, but once
the volume grows, Apache
relieves storage pressure by transmitting even though the whole HTML page has not yet
been resolved? If so, any
idea what the 'buffer' size might be? Or is there any way to adjust that 'buffer' size
HTML page by page?
Enquiring minds and all that...
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