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-rw-r--r--lib/url.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/url.c b/lib/url.c
index 47fc66aed..4c62b50ec 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -3040,7 +3040,14 @@ static CURLcode parse_connect_to_slist(struct Curl_easy *data,
#ifdef USE_ALTSVC
if(data->asi && !host && (port == -1) &&
- (conn->handler->protocol == CURLPROTO_HTTPS)) {
+ ((conn->handler->protocol == CURLPROTO_HTTPS) ||
+#ifdef CURLDEBUG
+ /* allow debug builds to circumvent the HTTPS restriction */
+ getenv("CURL_ALTSVC_HTTP")
+#else
+ 0
+#endif
+ )) {
/* no connect_to match, try alt-svc! */
enum alpnid srcalpnid;
bool hit;