javanna fd297637a2 Rest Client: add short performRequest method variants without params and/or body
Users wanting to send a request by providing only its method and endpoint, effectively the only two required arguments, shouldn't need to pass in an empty map and a null entity for the body. While at it we can also add a variant to send requests by specifying only method, endpoint and params, but not body. Headers remain a vararg as last argument, so they can always optionally be provided.

 Closes #19312
2016-07-11 10:36:04 +02:00
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