Current Behavior

The request to the forward-auth request contains a Content-Length header and the GET request has no body.

Expected Behavior

The forward-auth request has no Content-Length header.

Error Logs

apisix-1  | 2024/02/07 20:27:39 [error] 242#242: *648462 [lua] forward-auth.lua:134: phase_func(): failed to process forward auth, err: timeout, client: 172.27.0.1, server: _, request: "POST /test HTTP/1.1", host: "localhost:9080"
apisix-1  | 2024/02/07 20:27:39 [warn] 242#242: *648462 [lua] plugin.lua:1159: run_plugin(): forward-auth exits with http status code 403, client: 172.27.0.1, server: _, request: "POST /test HTTP/1.1", host: "localhost:9080"

Steps to Reproduce

1. Run APISIX
2. Deploy a service that can consume forward-auth requests
3. Create a route that has forward-auth enabled, with a GET request_method
   You can use the following plugin config:

   forward-auth:
        keepalive: true
        keepalive_pool: 100
        keepalive_timeout: 2000
        request_headers:
          - Authorization
        request_method: GET
        uri: http://some_auth_service/auth```

4. Send 2 requests to the protected route
5. Observe that the second request will fail with a timeout

Environment

• APISIX version 3.8.0