nginx: Move common proxy configuration into an include file.

(imported from commit 2ee5afc74fe146f8ee98f18f846342351c61c7f0)

puppet/zulip/files/nginx/zulip-include-app.d/external-sso.conf

@@ -4,6 +4,5 @@
 # identified the user.
 location /accounts/login/sso/ {
     proxy_pass https://localhost:8888;
-    proxy_set_header Host $host;
-    proxy_next_upstream off;
+    include /etc/nginx/zulip-include/proxy;
 }

puppet/zulip/files/nginx/zulip-include/app

@@ -16,14 +16,12 @@ location /static/ {
 # Send longpoll requests to Tornado
 location ~ /json/get_events|/json/events|/api/v1/events {
     proxy_pass       http://localhost:9993;
-    proxy_redirect   off;
+    include /etc/nginx/zulip-include/proxy;
 
     # Needed for longpolling
     proxy_buffering  off;
     proxy_read_timeout 1200;
 
-    proxy_next_upstream off;
-    proxy_set_header Host            $host;
     proxy_set_header X-Real-IP       $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 }
@@ -31,7 +29,6 @@ location ~ /json/get_events|/json/events|/api/v1/events {
 # Send sockjs requests to Tornado
 location /sockjs {
     proxy_pass http://localhost:9993;
-    proxy_next_upstream off;
     include /etc/nginx/zulip-include/location-sockjs;
 }
 

puppet/zulip/files/nginx/zulip-include/location-sockjs

@@ -1,12 +1,10 @@
-proxy_http_version 1.1;
+include /etc/nginx/zulip-include/proxy;
 
 # Needed for xhr_streaming transport
 proxy_buffering  off;
 proxy_read_timeout 1200;
-proxy_next_upstream off;
 
 proxy_set_header Upgrade         $http_upgrade;
 proxy_set_header Connection      $connection_upgrade;
-proxy_set_header Host            $host;
 proxy_set_header X-Real-IP       $remote_addr;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

puppet/zulip/files/nginx/zulip-include/proxy

@@ -0,0 +1,4 @@
+proxy_http_version 1.1;
+proxy_set_header Host $host;
+proxy_next_upstream off;
+proxy_redirect off;

puppet/zulip_internal/files/nginx/sites-available/loadbalancer

@@ -131,6 +131,6 @@ server {
 
     location / {
         proxy_pass http://127.0.0.1:9292/;
-        proxy_next_upstream off;
+        include /etc/nginx/zulip-include/proxy;
     }
 }

puppet/zulip_internal/files/nginx/zulip-include/loadbalancer

@@ -1,3 +1,3 @@
-proxy_set_header Host $host;
+include /etc/nginx/zulip-include/proxy;
 proxy_set_header X-Forwarded-For $remote_addr;
-proxy_next_upstream off;
+proxy_buffering off;