Error accessing openmrs rest web services

I am trying to access the rest web services using the Test link of REST Web Services provided on the administration page. When I access the concept endpoint, I get results but when I try obs or patient or encounter endpoints as per documentation, I get errors as below,

Successes with concept endpoint

Failure for obs endpoint

The error can be found at

Is there what I am doing wrong? Thank you

Are you trying to load all obs? Did you take a look at this? It says that at least one search parameter must be specified.!/obs/getAllObses