Backported updated RESTConnection.

main.py

@@ -13,7 +13,7 @@ class RestApp(App):
 
     def load_locations(self):
         self.root.ids.results.clear_widgets()
-        self.openmrs_connection.send_request('location', None, self.on_locations_loaded,
+        self.openmrs_connection.send_request('location', None, None, self.on_locations_loaded,
                                              self.on_locations_not_loaded, self.on_locations_not_loaded)
 
     def on_locations_loaded(self, _, response):

openmrs.py

@@ -8,11 +8,7 @@ except ImportError:
     from urllib.parse import quote
 
 
-class RESTConnection(object):
-    @staticmethod
-    def _construct_url(authority, port, resource):
-        return f'http://{authority}:{port}/openmrs/ws/rest/v1/{resource}'
-
+class RESTConnection:
     def __init__(self, authority, port, username, password):
         self.authority = authority
         self.port = port
@@ -23,8 +19,16 @@ class RESTConnection(object):
             'Content-type': 'application/json',
         }
 
-    def send_request(self, resource, post_parameters, on_success, on_failure, on_error):
-        url = RESTConnection._construct_url(self.authority, self.port, resource)
-        post_parameters = json.dumps(post_parameters) if post_parameters is not None else None
-        UrlRequest(url, req_headers=self.headers, req_body=post_parameters,
+    def construct_url(self, resource, get_parameters=None):
+        get_parameters = '&'.join(f'{quote(str(key))}={quote(str(value))}' for key, value in get_parameters.items()) \
+            if get_parameters is not None else ''
+        return f'http://{self.authority}:{self.port}/openmrs/ws/rest/v1/{resource}?{get_parameters}'
+
+    def send_request_by_url(self, url, post_parameters, on_success, on_failure, on_error):
+        UrlRequest(url, req_headers=self.headers,
+                   req_body=json.dumps(post_parameters) if post_parameters is not None else None,
                    on_success=on_success, on_failure=on_failure, on_error=on_error)
+
+    def send_request(self, resource, get_parameters, post_parameters, on_success, on_failure, on_error):
+        url = self.construct_url(resource, get_parameters)
+        self.send_request_by_url(url, post_parameters, on_success, on_failure, on_error)