fix: rename incorrect keyword argument to parse_query_string

AUTHORS.rst

@@ -40,3 +40,4 @@ Contributors (chronological)
 * Xiaoyu Lee <https://github.com/lee3164>
 * Jonathan Angelo <https://github.com/jangelo>
 * @zhenhua32 <https://github.com/zhenhua32>
+* @dodumosu <https://github.com/dodumosu>

src/webargs/falconparser.py

@@ -1,6 +1,8 @@
 # -*- coding: utf-8 -*-
 """Falcon request argument parsing module.
 """
+from distutils.version import LooseVersion
+
 import falcon
 from falcon.util.uri import parse_query_string
 
@@ -13,6 +15,9 @@
 status_map = {422: HTTP_422}
 
 
+FALCON_VERSION_INFO = tuple(LooseVersion(falcon.__version__).version)
+
+
 # Collect all exceptions from falcon.status_codes
 def _find_exceptions():
     for name in filter(lambda n: n.startswith("HTTP"), dir(falcon.status_codes)):
@@ -66,9 +71,12 @@ def parse_form_body(req):
             )
 
         if body:
-            return parse_query_string(
-                body, keep_blank_qs_values=req.options.keep_blank_qs_values
-            )
+            if FALCON_VERSION_INFO[0] < 2:
+                key = "keep_blank_qs_values"
+            else:
+                key = "keep_blank"
+            kwargs = {key: req.options.keep_blank_qs_values}
+            return parse_query_string(body, **kwargs)
     return {}