Reject request if header is missing

1

Using the tyk pro trial to evaluate some things

If I have a inbound API request going through the gateway, how can I send back a specific HTTP status code if a particular custom HTTP header is NOT present in the request?

i.e.

if HTTP header “x-my-header” is not present, respond w/ a 500

2

Hi Bitsofinfo,

you’d need to write a custom JS middleware.
For more information see this section in our docs, note the ReturnOverrides.

Thanks,
Kos @ Tyk Support Team

3

Have been trying this using a “virtualpath” plugin, can I do it that way w/ a function?

4

Hi Bitsofinfo,

It is possible but it’s more tricky because VP are more oriented to specific path/method combination so you’d have to extend the API spec for each case.
Writing a middleware will apply to all cases.

Thanks,
Kos @ Tyk Support Team

5

Kos - ok, well I’m trying a simple function on one path but it doesnt seem to be invoked, any way to debug this?

I’m using the docker pro trial sample compose launched setup

I also read that it is invoked AFTER the route is processed? Could this be why? Says: “you can plug short JavaScript functions at the end of a Tyk route and have them run when the endpoint is called.”

How do I “install” a middlware JS file to invoke in this docker setup?

6

Hi Bitsofinfo, can you share your container log? It would be useful to see if the required components are being loaded.

7

I’m just using the sample docker compose based setup, which container logs should I be looking at (gateway?)

8 
sed: cannot rename /opt/tyk-gateway/sedDsvDVP: Device or resource busy
sed: cannot rename /opt/tyk-gateway/sedVnRQVO: Device or resource busy
time="Jul 12 18:07:10" level=info msg="Connection dropped, connecting.."
time="Jul 12 18:07:10" level=info msg="Starting Poller"
time="Jul 12 18:07:10" level=info msg="PIDFile location set to: /var/run/tyk-gateway.pid"
time="Jul 12 18:07:10" level=error msg="Instrumentation is enabled, but no connectionstring set for statsd"
time="Jul 12 18:07:10" level=info msg="Initialising Tyk REST API Endpoints"
time="Jul 12 18:07:10" level=info msg="--> Standard listener (http)"
time="Jul 12 18:07:10" level=info msg="Setting up Server"
time="Jul 12 18:07:10" level=info msg="Registering node."
time="Jul 12 18:07:10" level=error msg="Request failed: Get http://tyk_dashboard:3000/register/node: dial tcp 172.23.0.4:3000: getsockopt: connection refused"
time="Jul 12 18:07:12" level=warning msg="Insecure configuration detected (allowing)!"
time="Jul 12 18:07:15" level=info msg="Node registered" id=2aff23df-45f3-4cce-512c-e412402e41b7
time="Jul 12 18:07:15" level=info msg="Initialising distributed rate limiter"
time="Jul 12 18:07:15" level=info msg="Starting gateway rate imiter notifications..."
time="Jul 12 18:07:15" level=info msg="Using /opt/tyk-gateway/tyk.conf for configuration"
time="Jul 12 18:07:15" level=info msg="Detected 0 APIs"
time="Jul 12 18:07:15" level=info msg="Loading API configurations."
time="Jul 12 18:07:16" level=info msg="Loading uptime tests..."
time="Jul 12 18:07:16" level=info msg="Initialised API Definitions"
time="Jul 12 18:07:16" level=info msg="Loading policies"
time="Jul 12 18:07:16" level=info msg="Using Policies from Dashboard Service"
time="Jul 12 18:07:16" level=info msg="Mutex lock acquired... calling"
time="Jul 12 18:07:16" level=info msg="Calling dashboard service for policy list"
time="Jul 12 18:07:16" level=info msg="Processing policy list"
time="Jul 12 18:07:16" level=info msg="Gateway started (v2.3.6)"
time="Jul 12 18:07:16" level=info msg="--> Listening on address: (open interface)"
time="Jul 12 18:07:16" level=info msg="--> Listening on port: 8080"
time="Jul 12 18:07:16" level=info msg="--> PID: 9"
9

Hi Bitsofinfo,

can you share your tyk.conf ?

Thanks,
Kos @ Tyk Support Team

10 
{
    "listen_port": 8080,
    "secret": "352d20ee67be67f6340b4c0605b044b7",
    "node_secret": "352d20ee67be67f6340b4c0605b044b7",
    "template_path": "/opt/tyk-gateway/templates",
    "tyk_js_path": "/opt/tyk-gateway/js/tyk.js",
    "middleware_path": "/opt/tyk-gateway/middleware",
    "use_db_app_configs": true,
    "db_app_conf_options": {
        "connection_string": "http://tyk_dashboard:3000",
        "node_is_segmented": false,
        "tags": ["test2"]
    },
    "app_path": "/opt/tyk-gateway/apps/",
    "storage": {
        "type": "redis",
        "host": "redis",
        "port": 6379,
        "username": "",
        "password": "",
        "database": 0,
        "optimisation_max_idle": 100
    },
    "enable_analytics": true,
   "analytics_config": {
        "type": "mongo",
        "csv_dir": "/tmp",
        "mongo_url": "",
        "mongo_db_name": "",
        "mongo_collection": "",
        "purge_delay": -1,
        "ignored_ips": []
    },
    "health_check": {
        "enable_health_checks": true,
        "health_check_value_timeouts": 60
    },
    "optimisations_use_async_session_write": true,
    "enable_non_transactional_rate_limiter": true,
    "enable_sentinel_rate_limiter": false,
    "allow_master_keys": false,
    "policies": {
        "policy_source": "service",
        "policy_connection_string": "http://tyk_dashboard:3000",
        "policy_record_name": "tyk_policies"
    },
   "hash_keys": true,
    "close_connections": true,
    "allow_insecure_configs": true,
     "coprocess_options": {
        "enable_coprocess": false,
        "coprocess_grpc_server": ""
    },
    "enable_bundle_downloader": true,
    "bundle_base_url": "",
    "global_session_lifetime": 100,
    "force_global_session_lifetime": false,
    "max_idle_connections_per_host": 100
}
11

Hi @bitsofinfo, you should add "enable_jsvm": true to your tyk.conf, see here.

12

Enabling that fixed it, thanks!