wscalls: unflatten payload when calling webservice (#66916)

tests/test_wscall.py

@@ -297,7 +297,7 @@ def test_webservice_with_unflattened_payload_keys(http_requests, pub):
     wscall.request = {
         'method': 'POST',
         'url': 'http://remote.example.net/json',
-        'post_data': {'foo/0': 'first', 'foo/1': 'second', 'bar': 'example'},
+        'post_data': {'foo/0': 'first', 'foo/1': 'second', 'name': 'example'},
     }
     wscall.store()
 

tests/workflow/test_wscall.py

@@ -591,12 +591,18 @@ def test_webservice_with_unflattened_payload_keys(http_requests, pub):
 
     item = WebserviceCallStatusItem()
     item.url = 'http://remote.example.net'
-    item.post_data = {'foo/0': 'first', 'foo/1': 'second', 'bar': 'example', 'random//field': 'value'}
+    item.post_data = {
+        'foo/0': 'first',
+        'foo/1': 'second',
+        'bar': 'example',
+        'form//name': '{{ form_name }}',
+    }
+    pub.substitutions.feed(formdata)
     item.perform(formdata)
     assert http_requests.get_last('url') == 'http://remote.example.net/'
     assert http_requests.get_last('method') == 'POST'
     payload = json.loads(http_requests.get_last('body'))
-    assert payload == {'foo': ['first', 'second'], 'bar': 'example', 'random/field': 'value'}
+    assert payload == {'foo': ['first', 'second'], 'bar': 'example', 'form/name': 'baz'}
     assert http_requests.count() == 1
 
     http_requests.empty()