System.net.webexception The Remote Server Returned An Error -502- Bad Gateway Info

async Task<string> GetWithRetryAsync(string url, int maxRetries = 3)

An investigation into the System.Net.WebException: The remote server returned an error: (502) Bad Gateway

System.Net.WebException: The remote server returned an error (502) Bad Gateway

In NGINX:

A 502 is often transient. Retry after a short delay.

Sometimes, a firewall or Intrusion Prevention System (IPS) sits between the gateway and the backend. If it abruptly terminates the TCP connection, the gateway interprets this as an invalid response. How to Fix the Exception Step 1: Verify the URL and Service Health