Add the url to the message of the IOException when an HTTP error occurs

Author: ebourg

jsign-core/src/main/java/net/jsign/jca/RESTClient.java

@@ -73,7 +73,7 @@ class RESTClient {
             if (contentType != null && contentType.startsWith("application/json")) {
                 throw new IOException(getErrorMessage(JsonReader.jsonToMaps(error)));
             } else {
-                throw new IOException("HTTP Error " + responseCode + (conn.getResponseMessage() != null ? " - " + conn.getResponseMessage() : ""));
+                throw new IOException("HTTP Error " + responseCode + (conn.getResponseMessage() != null ? " - " + conn.getResponseMessage() : "") + " (" + url + ")");
             }
         }
     }