We often find ourselves confounded by the fundamentals when it comes to implementing our own proxy. A Proxy can solve much more than a basic use case, and I will be elaborating on the various scenarios where proxies come in handy and will be speaking about the richness of Golang’s httputil package.

1. A Tale of Two(many) Proxies

2. What is a proxy
● Nginx
● Haproxy
● Squid
● Trafiek
● Fabio
● etc….

3. What is a proxy
Machine 1 Machine 2
Machine 1
Proxy
(Do
anything)
Machine 2

4. Types Properties
● Forward Proxy
● Reverse Proxy
● Transparent Proxy
● Anonymous Proxy
● Distorting Proxy
● …...

5. Forward proxy
Client 1
Client 2
Client 3
Proxy
Internet
Initial Traffic

6. Reverse proxy(may or may not be an LB)
Server 1
Server 2
Server 3
Proxy
Internet

7. Transparent Proxy
Server 1
Server 2
ProxyClient 1

8. What happens underneath
● Copy and dump data from one connection to another.
● Maintain this info in session table.

9. So why do we need to know all this, why not
just use existing ones

10. Karne se aata hai ……..

11. L3, L4 and L7

12. L3
● IP4/IP6 (sipproxy64)
● IPSec (VPN)
● …..

13. L4
● TCP
● UDP

14. https://godoc.org/github.com/google/tcpproxy

15. L7
● HTTP
● SMTP
● FTP

16. import “net/http/httputil”
https://golang.org/pkg/net/http/httputil/

17. Use Cases

18. Tee Proxy
Live Traffic Replication for parallel testing of about to go live system.

19. Nomad Client Proxy
An alternative to namespaces feature which is only available in nomad enterprise.

20. TLS Proxy
● Why we need it?

21. 2FA Proxy