Fastly-IO-Warning

Potential issues with Image Optimizer processing.

Fastly writes this header into responses. It is proprietary to Fastly.

This header is written by Fastly when a non-fatal error occurs in Image Optimizer.

User contributed notes

BETA

Do you see an error in this page? Do have an interesting use case, example or edge case people should know about? Share your knowledge and help people who are reading this page! (Comments are moderated; for support, please contact support@fastly.com)