1 files changed, 3 insertions, 1 deletions
diff --git a/lib/http2.c b/lib/http2.c
index 47583265d..b33782cc3 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -2026,8 +2026,10 @@ static ssize_t http2_send(struct connectdata *conn, int sockindex,
       nva[i].namelen = strlen((char *)nva[i].name);
     }
     else {
-      nva[i].name = (unsigned char *)hdbuf;
       nva[i].namelen = (size_t)(end - hdbuf);
+      /* Lower case the header name for HTTP/2 */
+      Curl_strntolower((char *)hdbuf, hdbuf, nva[i].namelen);
+      nva[i].name = (unsigned char *)hdbuf;
     }
     hdbuf = end + 1;
     while(*hdbuf == ' ' || *hdbuf == '\t')