Lua Filter

    The following documentation runs through the setup of both services.

    Step 1: Install Docker

    A simple way to achieve this is via the Docker Desktop.

    Step 2: Clone the Envoy repo and start all of our containers

    Terminal 1

    Step 3: Send a request to the service

    Terminal 1

    1. $ curl -v localhost:8000
    3.    Trying ::1...
    4. * TCP_NODELAY set
    5. * Connected to localhost (::1) port 8000 (#0)
    6. > GET / HTTP/1.1
    7. > Host: localhost:8000
    8. > User-Agent: curl/7.64.1
    9. > Accept: */*
    10. >
    12. < x-powered-by: Express
    13. < content-type: application/json; charset=utf-8
    14. < content-length: 544
    15. < date: Thu, 31 Oct 2019 03:13:24 GMT
    16. < x-envoy-upstream-service-time: 1
    17. < response-body-size: 544                      <-- This is added to the response header by our Lua script. --<
    18. < server: envoy
    19. <
    20. {
    21.   "path": "/",
    22.   "headers": {
    23.     "host": "localhost:8000",
    24.     "user-agent": "curl/7.64.1",
    25.     "accept": "*/*",
    26.     "x-forwarded-proto": "http",
    27.     "x-request-id": "a78fcce7-2d67-4eeb-890a-73eebb942a17",
    29.     "x-envoy-expected-rq-timeout-ms": "15000",
    30.   },
    31.   "method": "GET",
    32.   "body": "",
    33.   "fresh": false,
    34.   "hostname": "localhost",
    35.   "ip": "::ffff:172.20.0.2",
    36.   "ips": [],
    37.   "protocol": "http",
    38.   "query": {},
    39.   "subdomains": [],
    40.   "xhr": false,
    41.   "os": {
    42.     "hostname": "7ca39ead805a"
    43.   }
    44. * Connection #0 to host localhost left intact