POST application/protobuf binary data can get stuck

[vordimous]

Describe the bug
After posting poison pill messages that don't match the correct payload format, correctly formatted messages will not successfully post.

To Reproduce
Steps to reproduce the behavior:

1. download this example http.kafka.proto.zip
2. The README.md has instructions on how to post successful and incorrect proto messages
3. after Posting the "wrong order" message zilla will start failing to post correctly formatted messages

[vordimous]

The bug is replicated using protoc version 24.x, when upgrading to version version 28.x I am unable to replicate the bug.