Serve the shared Mempool explorer through the Angor indexer

apps/angor-indexer/container/nginx.conf

@@ -15,6 +15,14 @@ http {
         zone mempool_backend 64k;
         server mempool-api:8999 resolve;
     }
+    upstream mempool_frontend {
+        zone mempool_frontend 64k;
+        server mempool:8080 resolve;
+    }
+    map $http_upgrade $angor_connection_upgrade {
+        default upgrade;
+        '' close;
+    }
     server {
         listen 8080;
         client_max_body_size 4m;
@@ -23,7 +31,8 @@ http {
         proxy_send_timeout 30s;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
-        proxy_set_header Connection "";
+        proxy_set_header Connection $angor_connection_upgrade;
+        proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Authorization "";
         proxy_set_header Cookie "";
         proxy_hide_header Access-Control-Allow-Origin;
@@ -35,10 +44,6 @@ http {
         # Mempool's backend uses /api/v1. Match its frontend's shorter /api
         # surface too, without doubling already-versioned Angor URLs.
         rewrite ^/api/(?!v1/)(.*)$ /api/v1/$1 last;
-        location = / {
-            default_type application/json;
-            return 200 '{"service":"Angor Indexer","network":"mainnet","api":"/api/v1","health":"/health"}\n';
-        }
         # Readiness checks the indexing backend, not this gateway's process.
         location = /health {
             limit_except GET { deny all; }
@@ -54,10 +59,23 @@ http {
             limit_except GET POST { deny all; }
             proxy_pass http://mempool_backend;
         }
+        location = /api/v1/ws {
+            limit_except GET { deny all; }
+            proxy_read_timeout 600s;
+            proxy_send_timeout 600s;
+            proxy_pass http://mempool_backend;
+        }
         location /api/ {
             limit_except GET { deny all; }
             proxy_pass http://mempool_backend;
         }
-        location / { return 404; }
+        # Share the already-installed explorer; no second frontend or index DB.
+        # Its SPA handles transaction/block deep links and static assets.
+        location / {
+            limit_except GET { deny all; }
+            proxy_pass http://mempool_frontend;
+            proxy_intercept_errors on;
+            error_page 500 502 503 504 =503 @waiting;
+        }
     }
 }