CURLOPT_HTTP_VERSION

CURLOPT_HTTP_VERSION is one of the accepted parameters for curl_setopt parameter #2.

CURLOPT_HTTP_VERSION — CURL_HTTP_VERSION_NONE (default, lets CURL decide which version to use), CURL_HTTP_VERSION_1_0 (forces HTTP/1.0), CURL_HTTP_VERSION_1_1 (forces HTTP/1.1), CURL_HTTP_VERSION_2_0 (attempts HTTP 2), CURL_HTTP_VERSION_2 (alias of CURL_HTTP_VERSION_2_0), CURL_HTTP_VERSION_2TLS (attempts HTTP 2 over TLS (HTTPS) only) or CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE (issues non-TLS HTTP requests using HTTP/2 without HTTP/1.1 Upgrade).

CURLOPT_HTTP_VERSION = 84;