> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 4.11.1 **`(fix):`** Fix misleading "Network error" message when deserialization fails. JSON deserialization errors (e.g. unsupported date formats) are now reported as "Failed to deserialize response" instead of being incorrectly wrapped as network errors. **`(fix):`** Add RFC 1123 (RFC 2822) date format support to DateTimeDeserializer. Dates like "Thu, 07 May 2026 14:23:38 +0000" are now parsed correctly.