fix: add websocket handshake patch

Signed-off-by: Fernando Cainelli <fernando.cainelli-external@getyourguide.com>

WORKSPACE

@@ -38,6 +38,8 @@ http_archive(
     sha256 = ENVOY_SHA256,
     strip_prefix = ENVOY_REPO + "-" + ENVOY_SHA,
     url = "https://github.com/" + ENVOY_ORG + "/" + ENVOY_REPO + "/archive/" + ENVOY_SHA + ".tar.gz",
+    patches = ["fix-websocket-handshake.patch"],
+    patch_args = ["-p1"],
 )
 
 load("@envoy//bazel:api_binding.bzl", "envoy_api_binding")

external/fix-websocket-handshake.patch

@@ -0,0 +1,20 @@
+diff --git a/source/extensions/filters/http/ext_proc/ext_proc.h b/source/extensions/filters/http/ext_proc/ext_proc.h
+index 7873fca24c..ed9c69e1c2 100644
+--- a/source/extensions/filters/http/ext_proc/ext_proc.h
++++ b/source/extensions/filters/http/ext_proc/ext_proc.h
+@@ -433,6 +433,15 @@ public:
+   const ProcessorState& encodingState() { return encoding_state_; }
+   const ProcessorState& decodingState() { return decoding_state_; }
+
++  Envoy::Http::LocalErrorStatus
++  onLocalReply(const Envoy::Http::StreamFilterBase::LocalReplyData&) override {
++    ENVOY_LOG(debug, "When onLocalReply() is called, set processing_complete_ to true to skip "
++                     "external processing");
++    processing_complete_ = true;
++
++    return ::Envoy::Http::LocalErrorStatus::Continue;
++  }
++
+ private:
+   void mergePerRouteConfig();
+   StreamOpenState openStream();