Change the way JSON data is POSTed

validata_ui/pdf_renderer.py

@@ -62,7 +62,9 @@ class BrowserlessPDFRenderer(PDFRenderer):
         )
 
         # Request server
-        r = requests.post(self.api_url, headers=headers, params=params, json=data)
+        r = requests.post(
+            self.api_url, headers=headers, params=params, data=json.dumps(data)
+        )
         r.raise_for_status()
         log.info(
             "BrowserlessPDFRenderer.render: received response, content size = %d",