[CF1] tunnel streaming error (#21028)

Author: deadlypants1973

src/content/docs/cloudflare-one/connections/connect-networks/troubleshoot-tunnels/common-errors.mdx

@@ -173,3 +173,6 @@ By default the [`cloudflared` Docker container](https://github.com/cloudflare/cl
 
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+## Cloudflare Tunnel is buffering my streaming response instead of streaming it live.
+
+Proxied traffic through Cloudflare Tunnel is buffered by default unless the origin server includes the response header `Content-Type: text/event-stream`. The `Content-Type: text/event-stream` response header tells `cloudflared` to stream data as it arrives instead of buffering the entire response.