if there is a wrong parameter such like "wxh=1900x770ls /home/" it will cause an "IllegalArgumentException",And then be process with "badRequest" , because this response with "PNG" , the wrong parameter will be worte to a script ,add run。

there is a sample way to fix it temporarily
`---a/expand/opentsdb/src/tsd/HttpQuery.java
+++ b/expand/opentsdb/src/tsd/HttpQuery.java
@@ -421,8 +421,8 @@ final class HttpQuery extends AbstractHttpQuery {
HttpQuery.escapeJson(exception.getMessage(), buf);
buf.append(""}");
sendReply(HttpResponseStatus.BAD_REQUEST, buf);

• } else if (hasQueryStringParam("png")) {

•  sendAsPNG(HttpResponseStatus.BAD_REQUEST, exception.getMessage(), 3600);
  

• //} else if (hasQueryStringParam("png")) {

•  //sendAsPNG(HttpResponseStatus.BAD_REQUEST, exception.getMessage(), 3600);
  

  } else {
  sendReply(HttpResponseStatus.BAD_REQUEST,
  makePage("Bad Request", "Looks like it's your fault this time",`