MINOR: Use "500 Internal Server Error" for 500 error/status code message.
Internal Server Error is what is in RFC 2616/7231.
diff --git a/examples/errorfiles/500.http b/examples/errorfiles/500.http
index bb121e8..ebf7d47 100644
--- a/examples/errorfiles/500.http
+++ b/examples/errorfiles/500.http
@@ -1,9 +1,9 @@
-HTTP/1.0 500 Server Error
+HTTP/1.0 500 Internal Server Error
Cache-Control: no-cache
Connection: close
Content-Type: text/html
-<html><body><h1>500 Server Error</h1>
+<html><body><h1>500 Internal Server Error</h1>
An internal server error occured.
</body></html>