Bandwidth Hero Data Compression Service

This data compression service is used by Bandwidth Hero browser extension. It compresses given image to low-res WebP or JPEG image. Optionally it also converts image to greyscale to save even more data.

It downloads original image and transforms it with Sharp on the fly without saving images on disk.

This is NOT an anonymizing proxy — it downloads images on user's behalf, passing cookies and user's IP address through to the origin host.

Deployment

Google Cloud Functions

Options to set when deploying to google cloud

• Memory Allocated: between 256MB - 512MB recommended
• Runtime: NodeJS 8+ (Sharp doesn't build on Node 6 default)
• Function to Execute: bandwidthHeroProxy

ENVIRONMENT_VARIABLES MIN_COMPRESS_LENGTH=2048 (minimum byte length for an image to be compressible; default 2048 ~2kB)

Development

node ./express-wrapper.js

Note - VIP

increase Function Max Duration to 60 - Don't forget to press save

because the the conversion to avif takes more time than the default value of Function Max Duration of vercel