easy:SetOpt_HTTP

Name

easy:SetOpt_HTTP_Version -- specify HTTP protocol version to use

Synopsis

easy:SetOpt_HTTP_Version(version)

Function

Pass version as a value, get to one of the values described below. They ask libcurl to use the specific HTTP versions. This is not sensible to do unless you have a good reason. You have to get this option if you want to use libcurl's HTTP/2 support.

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 haven't asked for.

#CURL_HTTP_VERSION_NONE: We don't 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 can't be negotiated with the server. (Added in 7.33.0)
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 can't 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)

Inputs

version: input value

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