Fix: HTTPS redirect loop in ASP.NET Core production

The Error

Site never loads in production. Browser says:

ERR_TOO_MANY_REDIRECTS

Quick Fix - 1 Minute

Your load balancer/reverse proxy already handles HTTPS. Disable ASP.NET's redirect.

var app = builder.Build();
if (!app.Environment.IsDevelopment())
{
app.UseHsts();
}
else
{
app.UseHttpsRedirection(); // Only in Dev
}

Why This Happens

Azure/AWS/Nginx terminates SSL and forwards HTTP to your app. Your app sees HTTP and redirects to HTTPS. The proxy sees HTTPS, forwards as HTTP. Infinite loop.

Best Practice for.NET 8

1. Trust the proxy: Add app.UseForwardedHeaders() before UseHttpsRedirection

2. Check X-Forwarded-Proto: Make sure proxy sets this header

3. Dev vs Prod: Only use UseHttpsRedirection locally

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