How to give microservices access to Telegram (blocked at the network level) without changing the code?

If access to Telegram is blocked at the network level and changing the microservices code is not possible, the problem can be solved at the infrastructure level:

1. Configure a proxy server (e.g., SOCKS5 or HTTP proxy) that has access to Telegram and through which requests will be sent.

2. Use transparent proxy or iptables to redirect traffic of microservices aimed at Telegram through this proxy.

3. VPN or tunneling: set up a VPN server with access to Telegram and configure microservices traffic routing through the VPN.

4. DNS solutions: if the block is related to DNS, you can set up a local DNS server that resolves Telegram addresses to IPs accessible from the network.

Example with iptables for redirecting traffic to the proxy:

iptables -t nat -A OUTPUT -p tcp --dport 443 -d telegram.org -j REDIRECT --to-port 3128

where 3128 is the proxy port.

Thus, without changing the microservices code, access to Telegram can be ensured through network settings and proxies.