bug: batch-requests plugin: "connect to apisix failed: missing the port number" when connecting via unix socket

[ShaunMaher]

Current Behavior

If you configure Nginx to listen on a unix socket:

nginx_config:
  http_server_configuration_snippet: |
    listen unix:/run/sockets/apisix_http;

And then make a request that is handled by the batch-requests plugin, you get the following error:

connect to apisix failed: missing the port number

This is because the batch-requests plugin uses the ngx.var.server_port variable when setting up the internal request, assuming that it is populated with a port number. If the client connection came over a unix listening socket, ngx.var.server_port is a zero length string.

Expected Behavior

I get that unix sockets are probably an edge case but it would be nice if this worked.

I will submit a PR shortly with my modified batch-requests.lua that checks for this condition and then gets the server_port from the node_listen property of the APISIX configuration.

Error Logs

No response

Steps to Reproduce

• Use the latest docker image
• Configure nginx (via apisix config.yml) to listen on a unix socket:

nginx_config:
  http_server_configuration_snippet: |
    listen unix:/run/sockets/apisix_http;

• Configure the batch-requests plugin
• Issue a batch-request via the unix socket:
  curl --unix-socket /run/sockets/apisix_http http://127.0.0.1:9080/your_url --data '{}'

Environment

• APISIX version: 3.11.0
• Operating system:
• OpenResty / Nginx version: openresty/1.25.3.2
• etcd version: Using Standalone mode
• APISIX Dashboard version, if relevant: Dashboard not in use
• Plugin runner version, for issues related to plugin runners: N/A
• LuaRocks version, for installation issues (run luarocks --version): N/A