Fix forward_ports service and return useful nginx errors

[0div]

Description

Port forwaring

Use iptables to forward all localhost <> fc-ip ports instead of legacy port forwarding in envd-v0.0.1

They missing key seems to be to enable /proc/sys/net/ipv4/conf/eth0/route_localnet

Useful proxy error

When 502 happens at the session proxy (sandbox) level , we return a useful error depending on the user agent

Browser

API

jonas@mac js-sdk % curl -I https://3000-ihdzded4euz80ajegucyk-615d2cc7.goulash.dev/
HTTP/2 502
server: nginx/1.27.0
date: Thu, 30 Jan 2025 03:11:03 GMT
content-type: text/html
content-length: 111
via: 1.1 google
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000

{"error": "The sandbox is running but port is not open", "sandboxId": "ihdzded4euz80ajegucyk", "port": ":3000"}

Test

I built a template with this new provision and all js-sdk tests pass.

[linear]

E2B-1329 Return error indicating that the sandbox port is not open when making requests from SDK

[ValentaTomas]

One consideration here—one of the other reasons why we had the old envd there was because of the compatibility with the old SDK for now.

Does this change works when the old env is still present and tries to also forward the ports?

[0div]

Does this change works when the old env is still present and tries to also forward the ports?

It works with both running yeah, but :sad face: i was hoping we could stop using old envd for good