From 65c2203ffcedcf4817c590fe82c213dd45602d47 Mon Sep 17 00:00:00 2001
From: Franz Pletz <fpletz@fnordicwalking.de>
Date: Sat, 11 Feb 2017 04:11:35 +0100
Subject: [PATCH] nginx module: add option for proxying websocket requests

---
 nixos/modules/services/web-servers/nginx/default.nix   | 10 ++++++++++
 .../services/web-servers/nginx/location-options.nix    |  9 +++++++++
 2 files changed, 19 insertions(+)

diff --git a/nixos/modules/services/web-servers/nginx/default.nix b/nixos/modules/services/web-servers/nginx/default.nix
index 1aa8000502f5..e71a9e1885a8 100644
--- a/nixos/modules/services/web-servers/nginx/default.nix
+++ b/nixos/modules/services/web-servers/nginx/default.nix
@@ -92,6 +92,11 @@ let
         include ${recommendedProxyConfig};
       ''}
 
+      # $connection_upgrade is used for websocket proxying
+      map $http_upgrade $connection_upgrade {
+          default upgrade;
+          '''      close;
+      }
       client_max_body_size ${cfg.clientMaxBodySize};
 
       server_tokens ${if cfg.serverTokens then "on" else "off"};
@@ -213,6 +218,11 @@ let
         proxy_pass ${config.proxyPass};
         ${optionalString cfg.recommendedProxySettings "include ${recommendedProxyConfig};"}
       ''}
+      ${optionalString config.proxyWebsockets ''
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+      ''}
       ${optionalString (config.index != null) "index ${config.index};"}
       ${optionalString (config.tryFiles != null) "try_files ${config.tryFiles};"}
       ${optionalString (config.root != null) "root ${config.root};"}
diff --git a/nixos/modules/services/web-servers/nginx/location-options.nix b/nixos/modules/services/web-servers/nginx/location-options.nix
index d6f57404f822..4c772734a749 100644
--- a/nixos/modules/services/web-servers/nginx/location-options.nix
+++ b/nixos/modules/services/web-servers/nginx/location-options.nix
@@ -19,6 +19,15 @@ with lib;
       '';
     };
 
+    proxyWebsockets = mkOption {
+      type = types.bool;
+      default = false;
+      example = true;
+      description = ''
+        Whether to supporty proxying websocket connections with HTTP/1.1.
+      '';
+    };
+
     index = mkOption {
       type = types.nullOr types.str;
       default = null;