Logs littered with I/O exception, connection reset

[etlweather]

When I put a file, I see this in my logs:

2016-10-27 10:14:16.832  INFO 13736 --- [ XNIO-2 task-37] o.apache.http.impl.execchain.RetryExec   : I/O exception (java.net.SocketException) caught when processing request to {}->http://192.168.99.100:81: Connection reset

On the WebDAV server (based on NGINX):

2016-10-27T14:25:37.546043245Z 2016/10/27 14:25:37 [error] 11#0: *2196 client sent invalid chunked body, client: 192.168.99.1, server: localhost, request: "PUT /joe/4c7dd3a3-17e9-4871-9a7c-bafbf9ad7aee HTTP/1.1", host: "192.168.99.100:81"
2016-10-27T14:25:37.546089684Z 192.168.99.1 - - [27/Oct/2016:14:25:37 +0000] "PUT /joe/4c7dd3a3-17e9-4871-9a7c-bafbf9ad7aee HTTP/1.1" 401 194 "-" "Sardine/5.7"
2016-10-27T14:25:37.552600149Z 192.168.99.1 - test [27/Oct/2016:14:25:37 +0000] "PUT /joe/4c7dd3a3-17e9-4871-9a7c-bafbf9ad7aee HTTP/1.1" 201 25 "-" "Sardine/5.7"

The put works, the file is there and readable.

My code to save a file is as follow:

   public void save (String aPath, String aFilename, InputStream aInputStream) throws IOException
   {
      Sardine myDav = SardineFactory.begin (username, password);
      myDav.put (formUrl (aPath, aFilename), aInputStream);
   }

Is there anything I'm doing wrong or is this a bug? It's functionally working but annoying to get these notices in the logs if there is nothing wrong.

[almson]

The fault is in the server, which responds with "Connection: keep-alive" even though it doesn't support reusing connections.

The solution is to configure the http client to not reuse connections. This requires a small hack:

Sardine sardine = new SardineImpl ("username", "password")
{
      @Override protected HttpClientBuilder 
    configure(ProxySelector selector, CredentialsProvider credentials) {
        
            return super.configure (selector, credentials)
                    .setConnectionReuseStrategy (NoConnectionReuseStrategy.INSTANCE);
        }
};