Github user sardell commented on the issue:
https://github.com/apache/metron/pull/1217
Just wanted to let everyone know about a small fix I just pushed to here.
It turns out that Angular's HttpParams class is immutable. As a result, I
needed to set new parameters when instantiating the class rather than assigning
the instance to a variable and setting params through the variable.
For further reading, [here's the official
documentation](https://angular.io/api/common/http/HttpParams#description).
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