Merge pull request #1080 from nghttp2/nghttpx-fix-crash-with-backend-http-proxy-uri

nghttpx: Fix crash with --backend-http-proxy-uri option

src/shrpx_http2_session.cc

@@ -577,11 +577,11 @@ int Http2Session::initiate_connection() {
       }
     }
 
-    on_write_ = &Http2Session::downstream_write;
-    on_read_ = &Http2Session::downstream_read;
-
     // We have been already connected when no TLS and proxy is used.
     if (state_ == PROXY_CONNECTED) {
+      on_read_ = &Http2Session::read_noop;
+      on_write_ = &Http2Session::write_noop;
+
       return connected();
     }
 
@@ -1642,6 +1642,9 @@ int Http2Session::connection_made() {
 
   state_ = Http2Session::CONNECTED;
 
+  on_write_ = &Http2Session::downstream_write;
+  on_read_ = &Http2Session::downstream_read;
+
   if (addr_->tls) {
     const unsigned char *next_proto = nullptr;
     unsigned int next_proto_len = 0;