Update nginx.conf

This is to make HTTP requests from Lapis.

nginx.conf

@@ -43,6 +43,29 @@ http {
       ';
     }
 
+    location /proxy {
+      internal;
+      rewrite_by_lua "
+        local req = ngx.req
+
+        for k,v in pairs(req.get_headers()) do
+          if k ~= 'content-length' then
+            req.clear_header(k)
+          end
+        end
+
+        if ngx.ctx.headers then
+          for k,v in pairs(ngx.ctx.headers) do
+            req.set_header(k, v)
+          end
+        end
+      ";
+
+      resolver 8.8.8.8;
+      proxy_http_version 1.1;
+      proxy_pass $_url;
+    }
+
     location /map.html {
       root ./;
     }