maintain req error handler

app/controllers/copy_controller.js

@@ -115,6 +115,10 @@ function handleCopyFrom (logger) {
 
             req
                 .on('data', data => isGzip ? metrics.addGzipSize(data.length) : undefined)
+                .on('error', err => {
+                    metrics.end(null, err);
+                    pgstream.emit('error', err);
+                })
                 .on('close', () => {
                     const err = new Error('Connection closed by client');
                     pgstream.emit('cancelQuery', err);