cURL return last effective url, but don't download content?

Mikhail Kovalev

Suppose I have something like this

$resource = curl_init();
curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
curl_setopt($re source, CURLOPT_URL, '......');
curl_exec($reso urce);
$lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
curl_close($res ource);

I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?

Setting RETURNTRANSFER to FALSE outputs transfer directly

Aug 1 '08 #1

Subscribe Reply

4393

Mikhail Kovalev

On Aug 1, 10:47*pm, Mikhail Kovalev <mikhail_kova.. .@mail.ruwrote:

Suppose I have something like this

* * $resource = curl_init();
* * curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
* * curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
* * curl_setopt($re source, CURLOPT_URL, '......');
* * curl_exec($reso urce);
* * $lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
* * curl_close($res ource);

I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?

Setting RETURNTRANSFER to FALSE outputs transfer directly

Forgot to tell that I'm using CURLOPT_POST & CURLOPT_POSTFIE LDS in
there as well

I'm reading about CURLOPT_NOBODY in the manual, but it says
CURLOPT_HTTPGET , CURLOPT_POST and CURLOPT_HTTPPOS T will reset
CURLOPT_NOBODY

Aug 1 '08 #2

Jerry Stuckle

Mikhail Kovalev wrote:

Suppose I have something like this

$resource = curl_init();
curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
curl_setopt($re source, CURLOPT_URL, '......');
curl_exec($reso urce);
$lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
curl_close($res ource);

I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?

Setting RETURNTRANSFER to FALSE outputs transfer directly

Not really, to get the URL, cURL must download the page, if for no
other reason than to ensure there isn't another redirect.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attgl obal.net
=============== ===

Aug 2 '08 #3

Mikhail Kovalev

On Aug 2, 5:24*am, Jerry Stuckle <jstuck...@attg lobal.netwrote:

Mikhail Kovalev wrote:
Suppose I have something like this

* * $resource = curl_init();
* * curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
* * curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
* * curl_setopt($re source, CURLOPT_URL, '......');
* * curl_exec($reso urce);
* * $lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
* * curl_close($res ource);

I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?

Setting RETURNTRANSFER to FALSE outputs transfer directly

Not really, *to get the URL, cURL must download the page, if for no
other reason than to ensure there isn't another redirect.

A header is sufficient for this, or am I wrong?
(Which is exactly what CURLOPT_NOBODY does, btw.)

Aug 2 '08 #4

Jerry Stuckle

Mikhail Kovalev wrote:

On Aug 2, 5:24 am, Jerry Stuckle <jstuck...@attg lobal.netwrote:
>Mikhail Kovalev wrote:
>>Suppose I have something like this
$resource = curl_init();
curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
curl_setopt($re source, CURLOPT_URL, '......');
curl_exec($reso urce);
$lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
curl_close($res ource);
I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?
Setting RETURNTRANSFER to FALSE outputs transfer directly
Not really, to get the URL, cURL must download the page, if for no
other reason than to ensure there isn't another redirect.

A header is sufficient for this, or am I wrong?
(Which is exactly what CURLOPT_NOBODY does, btw.)

Did you try it? If so, did it work?

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attgl obal.net
=============== ===

Aug 2 '08 #5

Mikhail Kovalev

On Aug 2, 3:52*pm, Jerry Stuckle <jstuck...@attg lobal.netwrote:

Mikhail Kovalev wrote:
On Aug 2, 5:24 am, Jerry Stuckle <jstuck...@attg lobal.netwrote:
Mikhail Kovalev wrote:
Suppose I have something like this
* * $resource = curl_init();
* * curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
* * curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
* * curl_setopt($re source, CURLOPT_URL, '......');
* * curl_exec($reso urce);
* * $lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
* * curl_close($res ource);
I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?
Setting RETURNTRANSFER to FALSE outputs transfer directly
Not really, *to get the URL, cURL must download the page, if for no
other reason than to ensure there isn't another redirect.

A header is sufficient for this, or am I wrong?
(Which is exactly what CURLOPT_NOBODY does, btw.)

Did you try it? *If so, did it work?

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstuck...@attgl obal.net
=============== ===

It didn't work. There is a different option CURLOPT_RANGE, where you
can specify how many bytes to download. Alas, not all servers support
this, and I was not lucky this time.

Then I found that cURL allows you to specify a callback function to
write the output by pieces. For each piece the function must return
the exact number of bytes written, otherwise the download aborts. And
so:
curl_setopt($re source, CURLOPT_WRITEFU NCTION, 'hr_func_12A');

function hr_func_12A($re source, $string) { return 0; }

=)

Aug 2 '08 #6

Jerry Stuckle

Mikhail Kovalev wrote:

On Aug 2, 3:52 pm, Jerry Stuckle <jstuck...@attg lobal.netwrote:
>Mikhail Kovalev wrote:
>>On Aug 2, 5:24 am, Jerry Stuckle <jstuck...@attg lobal.netwrote:
Mikhail Kovalev wrote:
Suppose I have something like this
$resource = curl_init();
curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
curl_setopt($re source, CURLOPT_URL, '......');
curl_exec($reso urce);
$lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
curl_close($res ource);
I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?
Setting RETURNTRANSFER to FALSE outputs transfer directly
Not really, to get the URL, cURL must download the page, if for no
other reason than to ensure there isn't another redirect.
A header is sufficient for this, or am I wrong?
(Which is exactly what CURLOPT_NOBODY does, btw.)
Did you try it? If so, did it work?

--
============== ====
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstuck...@attg lobal.net
============== ====

It didn't work. There is a different option CURLOPT_RANGE, where you
can specify how many bytes to download. Alas, not all servers support
this, and I was not lucky this time.

Ah, then that answers your question, doesn't it?

Then I found that cURL allows you to specify a callback function to
write the output by pieces. For each piece the function must return
the exact number of bytes written, otherwise the download aborts. And
so:
curl_setopt($re source, CURLOPT_WRITEFU NCTION, 'hr_func_12A');

function hr_func_12A($re source, $string) { return 0; }

=)

Not a good idea to force an error - that will require extra work by the
remote server to terminate the sending and log the error. But the data
(unless it's huge) is probably already queued and ready to go.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attgl obal.net
=============== ===

Aug 2 '08 #7

Mikhail Kovalev

On Aug 2, 10:37*pm, Jerry Stuckle <jstuck...@attg lobal.netwrote:

Mikhail Kovalev wrote:
On Aug 2, 3:52 pm, Jerry Stuckle <jstuck...@attg lobal.netwrote:
Mikhail Kovalev wrote:
On Aug 2, 5:24 am, Jerry Stuckle <jstuck...@attg lobal.netwrote:
Mikhail Kovalev wrote:
Suppose I have something like this
* * $resource = curl_init();
* * curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
* * curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
* * curl_setopt($re source, CURLOPT_URL, '......');
* * curl_exec($reso urce);
* * $lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
* * curl_close($res ource);
I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?
Setting RETURNTRANSFER to FALSE outputs transfer directly
Not really, *to get the URL, cURL must download the page, if for no
other reason than to ensure there isn't another redirect.
A header is sufficient for this, or am I wrong?
(Which is exactly what CURLOPT_NOBODY does, btw.)
Did you try it? *If so, did it work?

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstuck...@attgl obal.net
=============== ===

It didn't work. There is a different option CURLOPT_RANGE, where you
can specify how many bytes to download. Alas, not all servers support
this, and I was not lucky this time.

Ah, then that answers your question, doesn't it?

Then I found that cURL allows you to specify a callback function to
write the output by pieces. For each piece the function must return
the exact number of bytes written, otherwise the download aborts. And
so:

curl_setopt($re source, CURLOPT_WRITEFU NCTION, 'hr_func_12A');

function hr_func_12A($re source, $string) { return 0; }

=)

Not a good idea to force an error - that will require extra work by the
remote server to terminate the sending and log the error. *But the data
(unless it's huge) is probably already queued and ready to go.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstuck...@attgl obal.net
=============== ===

From 50 to 900 kb

Well, I have no other suggestions. To honestly download the data and
then do nothing with it... doesn't lessen the amount of work for the
remote server.

Aug 2 '08 #8

Jerry Stuckle

Mikhail Kovalev wrote:

On Aug 2, 10:37 pm, Jerry Stuckle <jstuck...@attg lobal.netwrote:
>Mikhail Kovalev wrote:
>>On Aug 2, 3:52 pm, Jerry Stuckle <jstuck...@attg lobal.netwrote:
Mikhail Kovalev wrote:
On Aug 2, 5:24 am, Jerry Stuckle <jstuck...@attg lobal.netwrote:
>Mikhail Kovalev wrote:
>>Suppose I have something like this
>> $resource = curl_init();
>> curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
>> curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
>> curl_setopt($re source, CURLOPT_URL, '......');
>> curl_exec($reso urce);
>> $lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
>> curl_close($res ource);
>>I'm only interested in the $lastUrl address. Is it possible without
>>wasting bandwidth on downloading the actual trasfer which is at that
>>address ?
>>Setting RETURNTRANSFER to FALSE outputs transfer directly
>Not really, to get the URL, cURL must download the page, if for no
>other reason than to ensure there isn't another redirect.
A header is sufficient for this, or am I wrong?
(Which is exactly what CURLOPT_NOBODY does, btw.)
Did you try it? If so, did it work?
--
============ ======
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstuck...@at tglobal.net
============ ======
It didn't work. There is a different option CURLOPT_RANGE, where you
can specify how many bytes to download. Alas, not all servers support
this, and I was not lucky this time.
Ah, then that answers your question, doesn't it?

>>Then I found that cURL allows you to specify a callback function to
write the output by pieces. For each piece the function must return
the exact number of bytes written, otherwise the download aborts. And
so:
curl_setopt($ resource, CURLOPT_WRITEFU NCTION, 'hr_func_12A');
function hr_func_12A($re source, $string) { return 0; }
=)
Not a good idea to force an error - that will require extra work by the
remote server to terminate the sending and log the error. But the data
(unless it's huge) is probably already queued and ready to go.

--
============== ====
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstuck...@attg lobal.net
============== ====

From 50 to 900 kb

Well, I have no other suggestions. To honestly download the data and
then do nothing with it... doesn't lessen the amount of work for the
remote server.

But the work is already done by the server. Everything is most
probably sitting in a queue, just waiting to be sent. Whereas aborting
the transmission requires additional handling for the abnormal state.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attgl obal.net
=============== ===

Aug 2 '08 #9

edmund yau

Mikhail Kovalev æåˆ°:

On Aug 2, 3:52 pm, Jerry Stuckle <jstuck...@attg lobal.netwrote:
>Mikhail Kovalev wrote:
>>On Aug 2, 5:24 am, Jerry Stuckle <jstuck...@attg lobal.netwrote:
Mikhail Kovalev wrote:
Suppose I have something like this
$resource = curl_init();
curl_setopt($re source, CURLOPT_FOLLOWL OCATION, TRUE);
curl_setopt($re source, CURLOPT_RETURNT RANSFER, TRUE);
curl_setopt($re source, CURLOPT_URL, '......');
curl_exec($reso urce);
$lastUrl = curl_getinfo($r esource, CURLINFO_EFFECT IVE_URL);
curl_close($res ource);
I'm only interested in the $lastUrl address. Is it possible without
wasting bandwidth on downloading the actual trasfer which is at that
address?
Setting RETURNTRANSFER to FALSE outputs transfer directly
Not really, to get the URL, cURL must download the page, if for no
other reason than to ensure there isn't another redirect.
A header is sufficient for this, or am I wrong?
(Which is exactly what CURLOPT_NOBODY does, btw.)
Did you try it? If so, did it work?

--
============== ====
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstuck...@attg lobal.net
============== ====

It didn't work. There is a different option CURLOPT_RANGE, where you
can specify how many bytes to download. Alas, not all servers support
this, and I was not lucky this time.

Then I found that cURL allows you to specify a callback function to
write the output by pieces. For each piece the function must return
the exact number of bytes written, otherwise the download aborts. And
so:
curl_setopt($re source, CURLOPT_WRITEFU NCTION, 'hr_func_12A');

function hr_func_12A($re source, $string) { return 0; }

=)

IT manager è›‡é**é¼*çœ¼edm und yau (emailæ“¬ä¼¼ya* *****@hotmail.c om)
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