route not found error

[simbwa]

Hi folks.

Getting a "route not found error" from avenga/couper when I put an API gateway powered by avenga/couper behind Traefik.

Essentially, Traefik is the primary web proxy and avenger/couper acts as middleware to transform GET requests with query params to JSON to be posted to an internal microservice that accepts only JSON POST requests.

server {
  api {
  endpoint "/prod/rx/9000/mo" {
    proxy {
        backend {
            origin = env.BACKEND_ORIGIN
            path = env.BACKEND_PATH
        }
    }
    request "request" {
      json_body = {
	    id = request.id
        msgType = "mo"
        shortCode = "9K"
        srcId = "XX1"
        srcTypeId = "aggregator"
        msisdn = request.query.phone_no[0]
        msg = request.query.message[0]
        b64encoded = base64_encode(request.query.message[0])
        tstamp = unixtime()
        srcReq = {
            URL = request.url
            Headers = request.headers
        }
      }
    }
    response {
    	json_body = backend_responses.request.json_body
    }
  }
  }
}

Am testing out avenger/couper for the first time and am still learning & experimenting with it.
Please point me in the right direction on how to fix this issue.

[filex]

Hi @simbwa , can you post the full error message and ideally the corresponding line from Couper's log output?

[malud]

Hi @simbwa ,
The request block seems to be missing a target like the url or backend attribute. If you just want to transform a request to post specific content from the client request to an origin you just need the request and optionally a response block. You can remove the proxy block. The proxy block would forward the client request as is to the configured backend.

This works with curl -v http://localhost:8080/prod/rx/9000/mo\?message=asdf

server {
  api {
    endpoint "/prod/rx/9000/mo" {
      request {
        method = "POST"
        json_body = {
          id = request.id
          msgType = "mo"
          shortCode = "9K"
          srcId = "XX1"
          srcTypeId = "aggregator"
          msisdn = request.query.phone_no[0]
          msg = request.query.message[0]
          b64encoded = base64_encode(default(request.query.message[0], "empty"))
          tstamp = unixtime()
          srcReq = {
            URL = request.url
            Headers = request.headers
          }
        }

        backend = "my_service"
      }

      response {
        json_body = backend_responses.default.json_body.data
      }
    }
  }
}

definitions {
  backend "my_service" {
    origin = "https://httpbin.org"
    path = "/post"
  }
}

You could also following this example which could match your case: https://github.com/avenga/couper-examples/tree/master/custom-requests

Path not found: If you still see a not found error from Couper, change the endpoint "/**" path to a wildcard one and watch the logs which path Traefik uses at the end.

[simbwa]

Thanks @malud

Here is the twist

This works

curl -v http://localhost:8080/prod/rx/9000/mo\?message=asdf

But this does not work - access behind Traefik - returns a 404 error

curl -v https://event.mydomain.tld/prod/rx/9000/mo?phone_number=0789&message=test123

Here are the logs

{
    "build": "8ea8f09",
    "client_ip": "10.0.1.85",
    "handler": "file",
    "level": "error",
    "message": "route not found error",
    "method": "GET",
    "port": "80",
    "request": {
        "headers": {
            "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
            "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Safari/605.1.15"
        },
        "host": "event.mydomain.tld",
        "method": "GET",
        "origin": "event.mydomain.tld:80",
        "path": "/prod/rx/9000/mo?phone_number=0789\u0026message=test123",
        "proto": "http",
        "status": 404,
        "tls": false
    },
    "response": {
        "bytes": 8016,
        "headers": {
            "content-encoding": "gzip",
            "content-type": "text/html"
        }
    },
    "status": 404,
    "timestamp": "2023-02-12T10:25:55Z",
    "timings": {
        "total": 0.765
    },
    "type": "couper_access",
    "uid": "cfkbtcp8md2c73dfpl90",
    "url": "http://event.mydomain.tld:80/prod/rx/9000/mo?phone_number=0789\u0026message=test123",
    "version": "1.12.0"
}

[simbwa]

@malud I updated my couper.hcl to match what you shared. But still no luck behind Traefik.

@filex I have posted the full error message from the logs for your review.

Thanks

[simbwa]

Extra context.

Deployed in a docker swarm cluster with the Traefik as the proxy for all exposed services. Not sure if that detail is of significance or not.

[malud]

Hi, did you changed the default port for Couper or making use of the hosts attribute?
You may want to share your swarm config if its possible? Can't reproduce this at the moment.
thanks.

[simbwa]

@malud Sorry for my late response. In the end, I swapped out couper with Nginx and all worked well. That is why I didn't revert sooner.
Thanks all for your help.