560        conn->httpversion > 11) {  in Curl_http_auth_act()
563       conn->data->set.httpversion = CURL_HTTP_VERSION_1_1;  in Curl_http_auth_act()
1183      && conn->httpversion != 20) {  in Curl_add_buffer_send()
1622   if((data->state.httpversion == 10) || (conn->httpversion == 10))  in use_http_1_1plus()
1624   if((data->set.httpversion == CURL_HTTP_VERSION_1_0) &&  in use_http_1_1plus()
1625      (conn->httpversion <= 10))  in use_http_1_1plus()
1627   return ((data->set.httpversion == CURL_HTTP_VERSION_NONE) ||  in use_http_1_1plus()
1628           (data->set.httpversion >= CURL_HTTP_VERSION_1_1));  in use_http_1_1plus()
1654      (conn->httpversion != 20)) {  in expect100()
1837           else if((conn->httpversion == 20) &&  in Curl_add_custom_headers()
1957   if(conn->httpversion < 20) { /* unless the connection is re-used and already  in Curl_http()
1961       conn->httpversion = 20; /* we know we're on HTTP/2 now */  in Curl_http()
1973       if(conn->data->set.httpversion ==  in Curl_http()
1976         conn->httpversion = 20;  in Curl_http()
2587      conn->httpversion != 20 &&  in Curl_http()
2588      (data->set.httpversion == CURL_HTTP_VERSION_2)) {  in Curl_http()
2851       if(conn->httpversion != 20 &&  in Curl_http()
2990   if((conn->httpversion == 20) && data->req.upload_chunky)  in Curl_http()
3356            (conn->httpversion == 11) &&  in Curl_http_readwrite_headers()
3549                 conn->httpversion == 20)  in Curl_http_readwrite_headers()
3616                     &conn->httpversion,  in Curl_http_readwrite_headers()
3622           conn->httpversion = 0;  in Curl_http_readwrite_headers()
3628           conn->httpversion += 10 * httpversion_major;  in Curl_http_readwrite_headers()
3632             if(conn->httpversion != 20)  in Curl_http_readwrite_headers()
3641           conn->httpversion = 10;  in Curl_http_readwrite_headers()
3650               conn->httpversion = 10;  in Curl_http_readwrite_headers()
3669           conn->httpversion = 11; /* For us, RTSP acts like HTTP 1.1 */  in Curl_http_readwrite_headers()
3680         data->info.httpversion = conn->httpversion;  in Curl_http_readwrite_headers()
3681         if(!data->state.httpversion ||  in Curl_http_readwrite_headers()
3682            data->state.httpversion > conn->httpversion)  in Curl_http_readwrite_headers()
3684           data->state.httpversion = conn->httpversion;  in Curl_http_readwrite_headers()
3708         if(conn->httpversion == 10) {  in Curl_http_readwrite_headers()
3715         else if(conn->httpversion == 20 ||  in Curl_http_readwrite_headers()
3723         else if(conn->httpversion >= 11 &&  in Curl_http_readwrite_headers()
3820       if(conn->httpversion < 20) {  in Curl_http_readwrite_headers()
3832     else if((conn->httpversion == 10) &&  in Curl_http_readwrite_headers()
3845     else if((conn->httpversion == 11) &&  in Curl_http_readwrite_headers()
3856     else if((conn->httpversion == 10) &&  in Curl_http_readwrite_headers()
4031       enum alpnid id = (conn->httpversion == 20) ? ALPN_h2 : ALPN_h1;  in Curl_http_readwrite_headers()