Adding selfHandleResponse option parameter to Proxy policy

[josemf]

Adding selfHandleResponse and sending the option to node-http-proxy is important to enable processing responses from proxied backends.

Usually node-http-proxy pipes the proxied response through existing response stream. This can be disabled by selfHandleResponse. I supply an implementation suggestion for sending the proxied response through express res.send().

Plugins might monkey patch this method to effectively intercept and handle express gateway responses. As I do in: https://github.com/josemf/express-gateway-plugin-errors.

[XVincentX]

I'm sorry I haven't been able to jump on this yet.

[josemf]

@XVincentX that's ok,

I'm not even sure this is the best way do implement this, I mean we could just pass the selfHandleResponse to the proxy and expose http-proxy instance so a specific implementation (ex: https://github.com/josemf/express-gateway-plugin-errors) could hook to it and decide how responses should be handled.

Take your time, I just think express-gateway could offer some options for proxy data response handling.

🙏

[XVincentX]

I'm jumping on this again now — I completely lost the context :(