Convert every Cloudflare API error message into string (#3436)

CHANGELOG.txt

@@ -25,6 +25,7 @@ Changelog
  * Fix: IDs used in tabbed interfaces are now namespaced to avoid collisions with other page elements (Janneke Janssen)
  * Fix: Page title not displaying page name when moving a page (Trent Holliday)
  * Fix: The ModelAdmin module can now work without the wagtailimages and wagtaildocs apps installed (Andy Babic)
+ * Fix: Cloudflare error handling now handles non-string error responses correctly (hdnpl)
 
 
 1.9 (16.02.2017)

CONTRIBUTORS.rst

@@ -217,6 +217,7 @@ Contributors
 * Christine Ho
 * Trent Holliday
 * jacoor
+* hdnpl
 
 Translators
 ===========

docs/releases/1.10.rst

@@ -39,6 +39,7 @@ Bug fixes
  * IDs used in tabbed interfaces are now namespaced to avoid collisions with other page elements (Janneke Janssen)
  * Page title not displaying page name when moving a page (Trent Holliday)
  * The ModelAdmin module can now work without the wagtailimages and wagtaildocs apps installed (Andy Babic)
+ * Cloudflare error handling now handles non-string error responses correctly (hdnpl)
 
 
 Upgrade considerations

wagtail/contrib/wagtailfrontendcache/backends.py

@@ -101,7 +101,7 @@ class CloudflareBackend(BaseBackend):
             return
 
         if response_json['success'] is False:
-            error_messages = ', '.join([err['message'] for err in response_json['errors']])
+            error_messages = ', '.join([str(err['message']) for err in response_json['errors']])
             logger.error("Couldn't purge '%s' from Cloudflare. Cloudflare errors '%s'", url, error_messages)
             return