CURLOPT_HTTP_VERSION - Online Linux Manual PageSection : 3
Updated : January 19, 2022
Source : libcurl 7.82.0
Note : curl_easy_setopt options

NAMECURLOPT_HTTP_VERSION − HTTP protocol version to use

SYNOPSIS#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP_VERSION, long version);

DESCRIPTIONPass version a long, set to one of the values described below. They ask libcurl to use the specific HTTP versions. Note that the HTTP version is just a request. libcurl will still prioritize to re-use an existing connection so it might then re-use a connection using a HTTP version you have not asked for. CURL_HTTP_VERSION_NONE We do not care about what version the library uses. libcurl will use whatever it thinks fit. CURL_HTTP_VERSION_1_0 Enforce HTTP 1.0 requests. CURL_HTTP_VERSION_1_1 Enforce HTTP 1.1 requests. CURL_HTTP_VERSION_2_0 Attempt HTTP 2 requests. libcurl will fall back to HTTP 1.1 if HTTP 2 cannot be negotiated with the server. (Added in 7.33.0) When libcurl uses HTTP/2 over HTTPS, it does not itself insist on TLS 1.2 or higher even though that is required by the specification. A user can add this version requirement with CURLOPT_SSLVERSION(3). The alias CURL_HTTP_VERSION_2 was added in 7.43.0 to better reflect the actual protocol name. CURL_HTTP_VERSION_2TLS Attempt HTTP 2 over TLS (HTTPS) only. libcurl will fall back to HTTP 1.1 if HTTP 2 cannot be negotiated with the HTTPS server. For clear text HTTP servers, libcurl will use 1.1. (Added in 7.47.0) CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE Issue non-TLS HTTP requests using HTTP/2 without HTTP/1.1 Upgrade. It requires prior knowledge that the server supports HTTP/2 straight away. HTTPS requests will still do HTTP/2 the standard way with negotiated protocol version in the TLS handshake. (Added in 7.49.0) CURL_HTTP_VERSION_3 (Added in 7.66.0) Setting this value will make libcurl attempt to use HTTP/3 directly to server given in the URL. Note that this cannot gracefully downgrade to earlier HTTP version if the server does not support HTTP/3. For more reliably upgrading to HTTP/3, set the preferred version to something lower and let the server announce its HTTP/3 support via Alt-Svc:. See CURLOPT_ALTSVC(3).

DEFAULTSince curl 7.62.0: CURL_HTTP_VERSION_2TLS Before that: CURL_HTTP_VERSION_1_1

PROTOCOLSHTTP

EXAMPLECURL *curl = curl_easy_init(); if(curl) { CURLcode ret; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2TLS); ret = curl_easy_perform(curl); if(ret == CURLE_HTTP_RETURNED_ERROR) { /* an HTTP response error problem */ } }

AVAILABILITYAlong with HTTP

RETURN VALUEReturns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSOCURLOPT_SSLVERSION(3), CURLOPT_HTTP200ALIASES (3)," CURLOPT_HTTP09_ALLOWED(3), CURLOPT_ALTSVC (3)"
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