Fix bug that HTTP/2 hangs if whole response body is read with headers

For HTTP/2, we may read up everything including responde body with
header fields in Curl_http_readwrite_headers. If no content-length is
provided, curl waits for the connection close, which we emulate it
using conn->proto.httpc.closed = TRUE. The thing is if we read
everything, then http2_recv won't be called and we cannot signal the
HTTP/2 stream has closed. As a workaround, we return nonzero from
data_pending to call http2_recv.

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/http2.c b/lib/http2.c
index d364f3a77..b20854a3b 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -514,6 +514,10 @@ static ssize_t http2_recv(struct connectdata *conn, int sockindex,
 
   (void)sockindex; /* we always do HTTP2 on sockindex 0 */
 
+  if(httpc->closed) {
+    return 0;
+  }
+
   /* Nullify here because we call nghttp2_session_send() and they
      might refer to the old buffer. */
   httpc->upload_mem = NULL;