libcURL.HTTPVersion

libcURL.HTTPVersion

Enumeration

Protected Enum HTTPVersion
 None=0
 HTTP1_0=1
 HTTP1_1=2
 HTTP2=3
 HTTP2TLS=4
 HTTP2PriorKnowledge=5
 HTTP3=6
 HTTP3_Only=7

Remarks

The HTTPVersion controls which version(s) of HTTP to use .

HTTPVersion	Comment
None	Default, currently this is equivalent to HTTP1_1
HTTP1_0	Use HTTP version 1.0.
HTTP1_1	Use HTTP version 1.1.
HTTP2	Use HTTP version 2 if supported by the server, otherwise fallback to HTTP1_1.
HTTP2TLS	Use HTTP version 2 if supported by the server AND the request uses TLS, otherwise fallback to HTTP1_1.
HTTP2PriorKnowledge	Use HTTP version 2 for requests that do not use TLS without falling back to HTTP1_1.
HTTP3	Use HTTP version 3 if supported by the server, otherwise fallback to older versions.
HTTP3_Only	Use HTTP version 3 without falling back to older versions.

See also

• CURLOPT_HTTP_VERSION in the libcURL documentation