proxy_pass: attempt to forward premature upstream responses

Upstreams may shut us down while we're writing a request body,
attempt to forward any responses from the upstream back to the
client which may explain the rejection reason for giant uploads.

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/yahns/proxy_pass.rb b/lib/yahns/proxy_pass.rb
index d02bb40..e86e9c9 100644
--- a/lib/yahns/proxy_pass.rb
+++ b/lib/yahns/proxy_pass.rb
@@ -139,6 +139,11 @@ class Yahns::ProxyPass # :nodoc:
         close_req_body(input)
         prepare_wait_readable
       end
+    rescue Errno::EPIPE, Errno::ECONNRESET, Errno::ENOTCONN
+      # no more reading off the client socket, just prepare to forward
+      # the rejection response from the upstream (if any)
+      @yahns_client.to_io.shutdown(Socket::SHUT_RD)
+      prepare_wait_readable
     end
 
     def prepare_wait_readable