Process submitted_url using PreparedRequest.prepare_url instead of ju…

…st requote_uri.

perma_web/api/views.py

@@ -511,7 +511,7 @@ def post(self, request, format=None):
                     role='primary',
                     status='pending',
                     record_type='response',
-                    url=link.submitted_url,
+                    url=link.ascii_safe_url,
                 ).save()
 
                 # create screenshot placeholder

perma_web/perma/models.py

@@ -1599,8 +1599,16 @@ def ia_identifier(self):
 
     @cached_property
     def ascii_safe_url(self):
-        """ Encoded URL as string rather than unicode. """
-        return requests.utils.requote_uri(self.submitted_url)
+        """URL as encoded internally by python requests"""
+        try:
+            # Attempt to quote the URL as well as possible:
+            # - percent encoding
+            # - unicode domains to punycode
+            # - etc.
+            return requests.Request('GET', self.submitted_url).prepare().url
+        except requests.exceptions.RequestException:
+            # If that fails, just percent encode everything for safety
+            return requests.utils.requote_uri(self.submitted_url)
 
     @cached_property
     def url_details(self):