Try this: fetch the file using a browser, if you get the correct copy then
sniff whatever headers the browser is sending and match them.

On Thu, Jan 12, 2012 at 8:44 AM, Arif Ali Saiyed <asaiyed_at_adobe.com> wrote:

> Hi Daniel,
> Thanks for your response,
> I have tried all following option and it doesn't seems to work for me.
> //pHeader=curl_slist_append(pHeader,"Pragma:
> no-cache"); // Option 1
> pHeader=curl_slist_append(pHeader,"Cache-Control:
> no-cache"); // Option 2
> //pHeader=curl_slist_append(pHeader,"Cache-Control:
> must-revalidate"); // Option 3
> //pHeader=curl_slist_append(pHeader,"Cache-Control:
> max-age=0"); // Option 4
> //pHeader=curl_slist_append(pHeader,"Expires: Thu, 01 Dec
> 1994 16:00:00 GMT"); // Option 5
> curl_easy_setopt(handle,CURLOPT_HTTPHEADER,pHeader);
>
> First Attempt : Tried only option 1
> Second Attempt : Tried option 1 + Option 2
> Third Attempt : Tried option 1 + Option 2 + Option 5
> Fourth Attempt : Tried only option 3
> fifth Attempt : Tried only option 4
>
> but none of these seems to have worked ,
> I saw one more post http://curl.haxx.se/mail/lib-2005-04/0022.html
> But it seems I have already tried all these options.
>
> I have monitored my network traffic using the "Microsoft Network Monitor
> 3.4"
> And I see the http request packet ,
> ProtocolVersion is HTTP/1.1
> and there then I see all the headers that I have set Pragma,
> ChacheControl, Expires etc.
> since ProtocolVersion is HHTP/1.1 ChacheControl should have worked
> ideally isn't it?
>
> Is there anything that I am still missing.
> -Arif
>
> ------------------------------
>
> Message: 2
> Date: Wed, 11 Jan 2012 13:56:28 +0100 (CET)
> From: Daniel Stenberg <daniel_at_haxx.se>
> To: libcurl development <curl-library_at_cool.haxx.se>
> Subject: Re: Query regarding the caching problem faced with curl
> 7.19.3, how to disable cache usage ?
> Message-ID: <alpine.DEB.2.00.1201111354220.17896_at_tvnag.unkk.fr>
> Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
>
> On Wed, 11 Jan 2012, Arif Ali Saiyed wrote:
>
> > my problem is even after the file is being updated on web server, It's
> > still downloading the cached copy of it.
>
> This is not due to any caching done by curl though, as curl has no caching
> of contents at all - ever.
>
> > after some search I found that there is something called
> "Pragma:nochache"
> > header, but I am not sure how to use this ? there is no
> > curl_easy_setopt for doing this.
>
> You insert that header into a request by yourself with CURLOPT_HTTPHEADER.
> See http://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTHTTPHEADER
>
> --
>
> / daniel.haxx.se
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 11 Jan 2012 18:10:31 +0530
> From: Arif Ali Saiyed <asaiyed_at_adobe.com>
> To: "curl-users_at_cool.haxx.se" <curl-users_at_cool.haxx.se>,
> "curl-library_at_cool.haxx.se" <curl-library_at_cool.haxx.se>
> Subject: Query regarding the caching problem faced with curl 7.19.3,
> how to disable cache usage ?
> Message-ID:
> <
> B815C26F687D26448A336840033924ED420332970E_at_INDIAMBX01.corp.adobe.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi There,
> I am using curl 7.19.3 in my C++ code.
>
> My code fetches some http file, my problem is even after the file is
> being updated on web server, It's still downloading the cached copy of it.
>
> I want to know how to disable this behavior I have tried following easy
> set option but it did not work me
> curl_easy_setopt(handle, CURLOPT_FRESH_CONNECT, 1); // I
> guess this has got nothing to do with cache but still I tried and it did
> not help
> curl_easy_setopt(handle, CURLOPT_FORBID_REUSE, 1); // I
> guess this has got nothing to do with cache but still I tried and it did
> not help
> curl_easy_setopt(handle, CURLOPT_SSL_SESSIONID_CACHE, 0); // I
> guess this has got nothing to do with cache but still I tried and it did
> not help
>
> after some search I found that there is something called "Pragma:nochache"
> header, but I am not sure how to use this ? there is no curl_easy_setopt
> for doing this.
>
> Though its not needed following is the codesnippet of how I am using curl
>
> CURL* handle = curl_easy_init();
> CURLcode err = CURLE_READ_ERROR;
> if(handle)
> {
> currentStatus = kInitiated;
> curl_easy_setopt(handle, CURLOPT_URL, myFileName);
> curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION,
> my_write_data_handler);
> err = curl_easy_perform(handle);
> curl_easy_cleanup(handle);
> curl_global_cleanup();
> currentStatus = kCompleted;
> }
>
> -asaiyed
>
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Received on 2012-01-12