Hello Daniel, the drawing is perfectly clear, so my big mistake was
trying to send the headers from B to C and expecting them back in A, I
see now. I tried then to modify the addresses present in the response I
get from C in B, since they were relative uris and got their base uri
from B not C. The modification was fine, but each time I tried to go to
a link in A I got in troubles due to the session variables, ie, once I
get a response in B from C the session data is not present in B anymore
=> I ended up with a intermediate page with a form that submits itself
in the onLoad of the page to C :\, I know, it's not a very elegant
solution.
Thanks for all the replies,
Lizet

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-----Original Message-----
From: curl-and-php-bounces_at_cool.haxx.se
[mailto:curl-and-php-bounces_at_cool.haxx.se] On Behalf Of Daniel Stenberg
Sent: Friday, May 07, 2004 1:26 PM
To: using curl with PHP
Subject: RE: problem while redirecting with curl to an https

On Fri, 7 May 2004, Lizet Peña de Sola wrote:

Ok, I'll be a bit more lengthy and describe this with more details.

> The above code works fine, it passes all the POST parameters to the
> requested page and shows the page,

I'd like to make a drawing of how I view this:

(A) Browser <=> (B) Your HTTP server <=> (C) The HTTPS server

You send a POST (using PHP/curl) from B to C, and the results from that
is sent back to A.

> however all relative uri in the second page are taking the first page
> domain as their base uri, the page url isn't shown etc.

Of course, since the browser A is visiting the URL B, it has no idea
that you get the HTML from C.

> The http reference doc rfc2616 (downloadable from w3.org) is pretty
> strainght about the headers on a request, on a simple redirect with
> php
> header("Location: http://www.foo.com");

Yes, if your site (B) includes a Location: header back to (A) while at
the same time returning the correct HTTP response code, then the browser
will follow that hint.

> works fine except for POST methods.

In HTTP, you can return Location: headers to all requests.

> I included these two lines:
> $header[]="Location: https://https://www.foo.com"; curl_setopt ($ch,
> CURLOPT_HTTPHEADER, $header);

... yes, and that makes you include a Location: header in the outgoing
request from B to C, which won't make browser A do anything. A Location:
in a request-header has no effect on C or the response from it anyway.

> As a result of your reply to a previous post of mine on the Curl
> discussion list in haxx.es where you made a comment saying I needed to

> send the proper headers.

You said you wanted the browser to display a different URL, and one way
to accomplish that is to return a Location: header back. From B to A.

But that would also mean that the browser would leave your page/site.

> The documentation of curl is pretty scarce as in
> http://www.php.net/manual/en/ref.curl.php where there is a list of
> predefined constants that can be used with curl_setopt function but
> not an explanation of the constants.

I know, but I'm not responsible for any of that. When you use PHP/curl
you use a binding that is adjusted for PHP that is ontop of libcurl.

I write libcurl, I don't do anything in PHP/curl. libcurl is about doing
client-side file transfers.

> The doc found in http://curl.haxx.se/docs/httpscripting.html handles
> the Curl library from the command line.

That's my backyard. You can also read
http://curl.haxx.se/libcurl/c/curl_easy_setopt.html which is the libcurl
descriptions for most options that are also available and similarly
working in the php/curl interface.

> Please indicate me which other manuals should I read.

You need to understand the differences between A, B and C in my
"drawing". I don't know what manuals that takes.

-- 
     Daniel Stenberg -- http://curl.haxx.se -- http://daniel.haxx.se
      Dedicated custom curl help for hire: http://haxx.se/curl.html