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HTTPS request with curl library gives "out of memory" error

From: Ambarish Mitra <>
Date: Thu, 10 Jan 2008 19:07:25 +0530

Hi all,

When sending a HTTPS traffic with CURL library (<>) in a
C program, the curl API function "curl_easy_perform" throws an error code
CURLE_OUT_OF_MEMORY, which the 'curl_easy_strerror' translates to "out of

It is working in non-SSL mode, making me believe that there is some issue
with the SSL setup/config.

Moreover, it is working when we use the "curl" command in the command line:
[ambarish_at_ps2844 authzplugin]$ curl
https://secure-server:2443/home.html --cacert <file> // This works, the html
output is not shown.

I am on curl 7.12.1, and SSL support is enabled. Also, openssl version is:
OpenSSL 0.9.7a Feb 19 2003.

Any help/pointers will be very helpful.

Thanks, Ambarish Mitra.

Code snippet:

CURL* hCurl;
CURLcode res;
curl_slist* requestHeaders = NULL;

hCurl = curl_easy_init(); //Null checking done, not shown

// plethora of easy_setopt done, not shown here. Only the SSL options are
// if you think sending out all the options will be helpful, let me know,
and I will do that.

curl_easy_setopt(hCurl, CURLOPT_SSLVERSION, 3);


curl_easy_setopt(hCurl,CURLOPT_SSLKEYTYPE, "PEM");

curl_easy_setopt(hCurl, CURLOPT_SSL_VERIFYPEER, 0); // Verify Peer = 0, so
CA cert is not needed.

// CURL options to set/unset the request headers
requestHeaders = curl_slist_append(requestHeaders , "Pragma:" ) ;
//remove header
requestHeaders = curl_slist_append(requestHeaders , "Accept:" ) ;
//remove header
requestHeaders = curl_slist_append(requestHeaders ,

curl_easy_setopt( hCurl , CURLOPT_HTTPHEADER , requestHeaders);
res = curl_easy_setopt(hCurl, CURLOPT_URL,
https://secure-server:2443/program.cgi); // the endpoint

res = curl_easy_perform(hCurl);
if (res == CURLE_OK)
// OK. Set the data. Not shown here.
fprintf(stderr,"CURL perform error:%s",curl_easy_strerror(res)); // This
gives "out of memory"
curl_easy_cleanup(hCurl); // cleanup


curl_easy_cleanup(hCurl); // cleanup

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Received on 2008-01-10