Add response codes diagram and page (#104)

* Add response codes diagram to reverse-proxying.md
ExpediaGroup · Mar 8, 2018 · e1094f5 · e1094f5
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diff --git a/docs/assets/styx-server-errors-diagram.png b/docs/assets/styx-server-errors-diagram.png
diff --git a/docs/user-guide/reverse-proxying.md b/docs/user-guide/reverse-proxying.md
@@ -61,9 +61,13 @@ is sending faster than the receiver can consume.
 
 ## Styx Response Codes
 
-Styx responds with specific error codes when things don't go according to plan.
+Styx responds with specific error codes when things don't go according to plan. 
+This refers only to responses generated by Styx itself, not responses being proxied from downstream.
+For a general explanation of `5xx` (Server Error) codes, please see the [HTTP Spec](https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html).
 Here is a summary of those codes:
 
+![Styx 5xx Response Codes Diagram](../assets/styx-server-errors-diagram.png)
+
 #### 502 Bad Gateway
 
 * No route configured to backend service. An unexpected path prefix is received,