Simple Grayscale Proxy

A simple proxy server which proxies calls to an origin host and converts valid png/jpeg responses to grayscale. Requests timeout after five seconds. This server has been tested with https://maps.wikimedia.org/, https://secure.gravatar.com/ and https://i.redd.it/ explicitly. No guarantees that every server works correctly, especially if they have bizarre HTTP semantics around their response codes. Does not yet support query parameter passthrough, but this would be a simple feature to add.

Development

Configuration

This project relies on the following environment variables:

• ORIGIN_SERVER: the host to use as the origin server for requesting images
• APP_HOST: the host for the proxy server to listen on
• APP_PORT: the port for the proxy server to listen on

Try the following example configuration:

export ORIGIN_SERVER=https://maps.wikimedia.org/
export APP_HOST=localhost
export APP_PORT=3000

Build and Run

git clone git@github.com:dylrich/image-proxy.git && cd image-proxy
go build && ./image-proxy