Manual:cURL
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cURL, or Client URL, is a computer software project providing a library and command-line tool for transferring data using various protocols. Some MediaWiki extensions and bots use it to obtain data from websites. If you get a "Fatal error: Call to undefined function curl_init()" then you should use sudo apt-get install php-curl to install cURL.
While cURL is not a mandatory requirement of MediaWiki, it is strongly suggested. MediaWiki falls back to using file handling code where cURL is not installed. This works on most systems; however, under repetitive load, it can quickly become slow and bog down systems, often holding up the completion of requests.