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diff -Naur a/src/microhttpd/connection.c b/src/microhttpd/connection.c
--- a/src/microhttpd/connection.c 2016-04-08 21:02:26.000000000 +0200
+++ b/src/microhttpd/connection.c 2016-08-29 22:41:53.790560238 +0200
@@ -708,6 +708,8 @@
* "keep-alive", we proceed to use the default for the respective HTTP
* version (which is conservative for HTTP 1.0, but might be a bit
* optimistic for HTTP 1.1).
+ * In the case of Upgrade, the header Connection should not be set
+ * to keep-alive.
*
* @param connection the connection to check for keepalive
* @return #MHD_YES if (based on the request), a keepalive is
@@ -750,6 +752,59 @@
/**
+ * Should we try to keep the given connection alive? We can use the
+ * TCP stream for a second request if the connection is HTTP 1.1 and
+ * the "Connection" header either does not exist or is not set to
+ * "close", or if the connection is HTTP 1.0 and the "Connection"
+ * header is explicitly set to "keep-alive". If no HTTP version is
+ * specified (or if it is not 1.0 or 1.1), we definitively close the
+ * connection. If the "Connection" header is not exactly "close" or
+ * "keep-alive", we proceed to use the default for the respective HTTP
+ * version (which is conservative for HTTP 1.0, but might be a bit
+ * optimistic for HTTP 1.1).
+ * In the case of Upgrade, the connection should be kept alive even if
+ * the header Connection is not keep-alive.
+ *
+ * @param connection the connection to check for keepalive
+ * @return #MHD_YES if (based on the request), a keepalive is
+ * legal
+ */
+static int
+should_keepalive (struct MHD_Connection *connection)
+{
+ const char *end;
+
+ if (NULL == connection->version)
+ return MHD_NO;
+ if ( (NULL != connection->response) &&
+ (0 != (connection->response->flags & MHD_RF_HTTP_VERSION_1_0_ONLY) ) )
+ return MHD_NO;
+ end = MHD_lookup_connection_value (connection,
+ MHD_HEADER_KIND,
+ MHD_HTTP_HEADER_CONNECTION);
+ if (MHD_str_equal_caseless_(connection->version,
+ MHD_HTTP_VERSION_1_1))
+ {
+ if (NULL == end)
+ return MHD_YES;
+ if ( (MHD_str_equal_caseless_ (end, "close")) )
+ return MHD_NO;
+ return MHD_YES;
+ }
+ if (MHD_str_equal_caseless_(connection->version,
+ MHD_HTTP_VERSION_1_0))
+ {
+ if (NULL == end)
+ return MHD_NO;
+ if (MHD_str_equal_caseless_(end, "Keep-Alive"))
+ return MHD_YES;
+ return MHD_NO;
+ }
+ return MHD_NO;
+}
+
+
+/**
* Produce HTTP "Date:" header.
*
* @param date where to write the header, with
@@ -2795,7 +2850,7 @@
}
if (((MHD_YES == connection->read_closed) &&
(0 == connection->read_buffer_offset)) ||
- (MHD_NO == keepalive_possible (connection)))
+ (MHD_NO == should_keepalive (connection)))
{
/* have to close for some reason */
MHD_connection_close_ (connection,
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