Re: How to push prompt to browser?

I have reduced my scope a little now. What i have done is when a cache is
missed, i will
have a filter to see if the url has a parameter made by me, like
"?abc_is_good". If yes, go direct,
If no, (which should be at the first time.), then the squid will generate a
page and the page have some javascript to redirect the user to their
requested url with my generated tag "?abc_is_good" at the end of the url.
Then the page should be in a "loading" mode. The generated page will also
have javascript to open a new browser window and ask whether the user want
to load the page in background in stead of waiting. The popup window will
know the url he/she requested and when
he click the background load button, the page will be stored in something
like a stack for background loading. Currently i have done most part exempt
the part about background loading.
But i have face problems.

1. When a page is redirected that way, the user will lost the parameter they
posted in a form in a
post action, so they will never get to the page because the destination
server will log him off. This
is the case in hotmail.

2. I have done something to filter out the r->urlpath.buf and see if it
contains word like html, jsp etc, if yes, then i use this scheme. Otherwise
if it contains other words, i will just go direct for a miss. However, this
means that i have to include any extension a webpage may have. I don't mind
if i incorrectly forward a text page directly since it do no harm exempt
from going direct.

3. In the background loading method, i have create a new request_t and
storeEntry using the tool supplied in store.c and HttpRequest.c. and then i
copy the original url, host information and put in the new request_t and
storeEntry object. and then i try to forward the request from a threaded
function using this new object. like fwdStart(-1, new_e, new_t); but i don't
think the page is being
fatched this way. But this is better then the way i tried last time, because
at lease squid won't crash.
Am i missing something so the connection is not done?

4. I want to trace the program, i run squid using squid -D mode already, but
the error doesn't shown in screen. i thought they are outputed in stderr. Do
i need to reconfigure squid to do that?

thanks lot.

cheers
Louis

----- Original Message -----
From: "Henrik Nordstrom" <hno@squid-cache.org>
To: "Louis Lau" <louis_lau@nechk.nec.com.hk>
Cc: <squid-users@squid-cache.org>; <squid-dev@squid-cache.org>
Sent: Saturday, February 08, 2003 12:09 AM
Subject: Re: How to push prompt to browser?

> You have two options
>
> a) Send a temporary redirect to another URL with the question
>
> b) Respond with a uncacheable content displaying the question.
>
>
> And in both cases you have figure out a way how the user can confirm
> that he wants the object downloaded..
>
>
> However you need to know that HTTP knows nothing about "pages". In HTTP
> a "page" simply consists of N objects, each requested individually with
> no direct relation between the requests, usually starting with the HTML
> content, then style sheets, inline images etc.. and the browser also
> caches items locally so you may end up with only having a request for a
> single inlined image when the user selects to display a certain page, or
> none at all.. It is only the browser who has a notion of what a "page"
> is by parsing the HTML content.
>
> Lets take a simple page as an example
>
> http://www.squid-cache.org/
>
> This page consists of the following HTTP objects
>
> http://www.squid-cache.org/
> http://www.squid-cache.org/Squidlogo2.gif
> http://www.squid-cache.org/Icons/squidnow.gif
> http://www.squid-cache.org/Icons/cache_now.gif
>
> When the browser has all 4 objects the page is fully displayed. If the
> browser is missing one or more of these objects it will send individual
> HTTP requests for each missing object.
>
> To Squid the request for http://www.squid-cache.org/ is no different
> from the request for http://www.squid-cache.org/Squidlogo2.gif or any of
> the other inline images. It is just a HTTP request for a specific URL.
>
>
> You also need to keep in mind that there is also many other applications
> than browsers using HTTP. There is such things as antivirus agent
> updates, various active applets requesting special information (i.e.
> "realtime" stock exchange rates or whatever)... and many more, and you
> do not want these to be "disturbed" by your question as there is no
> human in the other end who can confirm the question..
>
>
>
>
>
> fre 2003-02-07 klockan 09.30 skrev Louis Lau:
> > I don't know if this would simplify my problem. Does anyone know how to
push
> > prompt to browser in some occassion? like if they are accessing a site
not
> > in cache, prompt them and only get that page directly if they want?
>
> --
> Henrik Nordstrom <hno@squid-cache.org>
> MARA Systems AB, Sweden
>
Received on Tue Feb 11 2003 - 07:59:11 MST