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-rw-r--r--include/curl/curl.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/curl/curl.h b/include/curl/curl.h
index e0d5c0f4e..96ea1f2a0 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -1727,6 +1727,8 @@ enum {
CURL_HTTP_VERSION_1_1, /* please use HTTP 1.1 in the request */
CURL_HTTP_VERSION_2_0, /* please use HTTP 2 in the request */
CURL_HTTP_VERSION_2TLS, /* use version 2 for HTTPS, version 1.1 for HTTP */
+ CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE, /* please use HTTP 2 without HTTP/1.1
+ Upgrade */
CURL_HTTP_VERSION_LAST /* *ILLEGAL* http version */
};