Merge pull request #182 from phil-schreiber/fix/http-response-code

convert error header into request error

Author: DoubleDi

Diff for: conn.go

@@ -14,6 +14,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"strings"
 	"sync/atomic"
 	"time"
 
@@ -293,6 +294,9 @@ func (c *conn) doRequest(ctx context.Context, req *http.Request) (io.ReadCloser,
 		// response
 		return nil, newError(string(msg))
 	}
+	if errHeader, ok := resp.Header[http.CanonicalHeaderKey("X-ClickHouse-Exception-Code")]; ok {
+		return nil, newError(strings.Join(errHeader, ", "))
+	}
 
 	return resp.Body, nil
 }