edge-proxy

• Proxy service on the edge providing HTTP routing service for gateway-based services and reserve tunnel service for cloud-based services.

Requires in minimum golang version 1.17 to build (due to net version 0.7.0 update).

Use Cases

1. A cloud-based service needs to make a request to gateway-based service
2. A gateway-based service needs to make a request to a cloud-based service

Proxy composition diagram

This is a diagram showing how the various components connect together to proxy a request originating locally through to a remote server.

Command show in this diagram:

$ fp-edge \
-proxy-uri=https://my.proxy.com \
-tunnel-uri=ws://my.service.local/edge-proxy/connect \
-cert-strategy=file \
-cert-strategy-options=cert=certs/gateway-cert.pem \
-cert-strategy-options=key=certs/gateway-private-key.pem \
-forwarding-addresses={\"my.service.local\":\"my.service.com\"}

Proxy routing:

1. An HTTP request is received from a program running on the gateway
2. The 'Host' header is updated based on the mapping in the 'forwarding-addresses' parameter. If no mapping is found the 'Host' header is set to the hostname of the proxy. The URL hostname is then updated to match that of the new 'Host' header
3. The request is converted to HTTPS and the port is changed to 443. The request type, path and headers are left unchanged from the previous step.

Notes

• All requests from edge-proxy to the cloud are done over HTTPS
• The path component of the URL is never changed for a proxied request

HTTP(S) Tunnels

Edge-proxy has the option for tunneling traffic over HTTP CONNECT. This can be done over a TLS connection and/or a non-TLS plain HTTP connection. At maximum, one plain and one TLS tunnel can be specified. The following command line options specify the HTTP(S) tunnels. These options are independent of the -cert-strategy and -cert-strategy-options options, as they control different proxy services.

  -http-tunnel-listen string
    	Listen address for HTTP (CONNECT) tunnel server (default "localhost:8888")
  -https-tunnel-listen string
    	Listen address for HTTPS (CONNECT) tunnel server over TLS.  Both tunnels can be served at the same time.
  -https-tunnel-tls-cert string
    	For the HTTPS tunnel, specify file name and path to the TLS certificate /path/file.crt
  -https-tunnel-tls-key string
    	For the HTTPS tunnel, specify file name and path to the TLS key /path/file.key