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-rw-r--r--docs/libcurl/opts/CURLOPT_ALTSVC_CTRL.38
1 files changed, 6 insertions, 2 deletions
diff --git a/docs/libcurl/opts/CURLOPT_ALTSVC_CTRL.3 b/docs/libcurl/opts/CURLOPT_ALTSVC_CTRL.3
index 98ba44014..00d1471bb 100644
--- a/docs/libcurl/opts/CURLOPT_ALTSVC_CTRL.3
+++ b/docs/libcurl/opts/CURLOPT_ALTSVC_CTRL.3
@@ -5,7 +5,7 @@
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
-.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
@@ -38,11 +38,15 @@ CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ALTSVC_CTRL, long bitmask);
Populate the long \fIbitmask\fP with the correct set of features to instruct
libcurl how to handle Alt-Svc for the transfers using this handle.
-libcurl will only accept Alt-Svc headers over a secure transport, meaning
+libcurl only accepts Alt-Svc headers over a secure transport, meaning
HTTPS. It will also only complete a request to an alternative origin if that
origin is properly hosted over HTTPS. These requirements are there to make
sure both the source and the destination are legitimate.
+Alternative services are only used when setting up new connections. If there
+exists an existing connection to the host in the connection pool, then that
+will be preferred.
+
Setting any bit will enable the alt-svc engine.
.IP "CURLALTSVC_READONLYFILE"
Do not write the alt-svc cache back to the file specified with