Tweak log messages, use JSON

validata_ui/pdf_renderer.py

 """PDF report rendering utilities."""
+import json
 from abc import ABC, abstractmethod
 import logging
 
@@ -32,12 +33,11 @@ class BrowserlessPDFRenderer(PDFRenderer):
     """Browserless IO implementation."""
 
     def __init__(self, api_url: str, api_token: str):
-        log.info('BrowserlessPDFRenderer(%s,XXX)', api_url)
+        log.info("BrowserlessPDFRenderer: creating instance with api_url = %r", api_url)
         self.api_url = api_url
         self.api_token = api_token
 
     def render(self, url: str):
-        log.info("BrowserlessPDFRenderer.render(%s)", url)
         headers = {
             "Cache-Control": "no-cache",
             "Content-Type": "application/json",
@@ -51,12 +51,18 @@ class BrowserlessPDFRenderer(PDFRenderer):
                 "format": "A4",
             },
         }
-        log.info("BrowserlessPDFRenderer.render data = %r", data)
+        log.info(
+            "BrowserlessPDFRenderer.render: about to send a POST request to "
+            "browserless with data = %r and headers = %r",
+            json.dumps(data),
+            json.dumps(headers),
+        )
 
         # Request server
-        log.info("BrowserlessPDFRenderer.render before post")
         r = requests.post(self.api_url, headers=headers, params=params, json=data)
-        log.info("BrowserlessPDFRenderer.render after post")
         r.raise_for_status()
-        log.info("BrowserlessPDFRenderer.render content size = %d", len(r.content))
+        log.info(
+            "BrowserlessPDFRenderer.render: received response, content size = %d",
+            len(r.content),
+        )
         return r.content