August 29, 2015 by dmacias Use of undefined constant CURL_HTTP_VERSION_1_1 – assumed ‘CURL_HTTP_VERSION_1_1’ Linux, Technology Leave a comment I was getting this problem even though I did have curl installed. However, I forgot to restart apache. To install curl: apt-get install php5-curl To restart Apache2: service apache2 restart ~david Share this:TwitterFacebookLinkedIn