Set request parameter templates with [] inside do not pass Expressions matching check

When adding a Set query param template using the feign.RequestTemplate#query(java.lang.String, java.lang.Iterable<java.lang.String>) method, we pass a query with a name containing [] and a corresponding template value, for example name = "ids[]" and then a List containing {ids[]} value. This causes an issue as a template containing [] does not pass the entry -> entry.getKey().matcher(expression).matches() filter in feign.template.Expressions#create method against the SimpleExpression pattern, created as follows: Pattern.compile("(\\w[-\\w.]*[ ]*)(:(.+))?"), SimpleExpression.class;

As an http call to [requestUrl]?ids[]=1,2,3 would work, it should probably work via Feign as well.

This issue causes the following issue in Spring Cloud OpenFeign: https://github.com/spring-cloud/spring-cloud-openfeign/issues/143 that has been reported to us by the users.

[kdavisk6]

@OlgaMaciaszek

I’ll check with the others, but I think we can release a patched 10.2.1 sometime in the next week.

[OlgaMaciaszek]

@kdavisk6 Yes, that’ll probably be the best solution.