Follow Fastly normalization of Accept-Encoding

Reduce cookie storage latency

• Fix payload size of new headers sent to the API Server

• Update payload field name (XForwardedForIp)

• Improved headers management

• Improved headers management

• Fixed typo in payload field name (XForwardedForIp)
• Switched to semantic versioning

Fixed typo in payload field name (XForwardedForIp)

• Add proxy support

• Fixed potential double execution of callbacks