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Couper

Couper

Couper is designed to support developers building and operating API-driven Web projects by offering security and observability functionality in a frontend gateway component.

For additional information, tutorials and documentation please visit the couper repository.

Usage

Couper requires a configuration file which have to be provided on start. See our documentation how to configure couper.

This image contains a basic configuration to serve files from /htdocs directory.

docker run --rm -p 8080:8080 -v `pwd`:/htdocs avenga/couper

Command

The entrypoint of the image is the /couper binary. The command is run.

Therefore docker run avenga/couper runs /couper run. You could also use other commands directly:

docker run avenga/couper version
docker run avenga/couper run -watch -p 8081

Environment options

Variable Default Description
COUPER_FILE couper.hcl Path to the configuration file.
COUPER_ACCEPT_FORWARDED_URL "" Which X-Forwarded-* request headers should be accepted to change the request variables url, origin, protocol, host, port. Comma-separated list of values. Valid values: proto, host, port.
COUPER_DEFAULT_PORT 8080 Sets the default port to the given value and does not override explicit [host:port] configurations from file.
COUPER_HEALTH_PATH /healthz Path for health-check requests for all servers and ports.
COUPER_HTTPS_DEV_PROXY "" List of tls port mappings to define the tls listen port and the target one. A self-signed certificate will be generated on the fly based on given hostname.
COUPER_NO_PROXY_FROM_ENV false Disables the connect hop to configured proxy via environment.
COUPER_SECURE_COOKIES "" If set to "strip", the Secure flag is removed from all Set-Cookie HTTP header fields.
COUPER_WATCH false Set to true to watch for configuration file changes.
COUPER_WATCH_RETRIES 5 Maximal retry count for configuration reloads which could not bind the configured port.
COUPER_WATCH_RETRY_DELAY 500ms Delay duration before next attempt if an error occurs.
COUPER_XFH false Global configurations which uses the Forwarded-Host header instead of the request host.
COUPER_BETA_METRICS false Option to enable the prometheus metrics exporter.
COUPER_BETA_METRICS_PORT 9090 Prometheus exporter listen port.
COUPER_BETA_SERVICE_NAME couper The service name which applies to the service_name metric labels.
COUPER_REQUEST_ID_ACCEPT_FROM_HEADER "" Name of a client request HTTP header field that transports the request.id which Couper takes for logging and transport to the backend (if configured).
COUPER_REQUEST_ID_BACKEND_HEADER Couper-Request-ID Name of a HTTP header field which Couper uses to transport the request.id to the backend.
COUPER_REQUEST_ID_CLIENT_HEADER Couper-Request-ID Name of a HTTP header field which Couper uses to transport the request.id to the client.
COUPER_REQUEST_ID_FORMAT common If set to uuid4 a rfc4122 uuid is used for request.id and related log fields.
COUPER_TIMING_IDLE_TIMEOUT 60s The maximum amount of time to wait for the next request on client connections when keep-alives are enabled.
COUPER_TIMING_READ_HEADER_TIMEOUT 10s The amount of time allowed to read client request headers.
COUPER_TIMING_SHUTDOWN_DELAY 0 The amount of time the server is marked as unhealthy until calling server close finally.
COUPER_TIMING_SHUTDOWN_TIMEOUT 0 The maximum amount of time allowed to close the server with all running connections.
COUPER_LOG_FORMAT common Can be set to json output which is the container default.
COUPER_LOG_LEVEL info Set the log-level to one of: info, panic, fatal, error, warn, debug, trace.
COUPER_LOG_PARENT_FIELD "" An option for json log format to add all log fields as child properties.
COUPER_LOG_PRETTY false Global option for json log format which pretty prints with basic key coloring.
COUPER_LOG_TYPE_VALUE couper_daemon Value for the runtime log field type.
COUPER_ACCESS_LOG_REQUEST_HEADERS User-Agent, Accept, Referer A comma separated list of header names whose values should be logged.
COUPER_ACCESS_LOG_RESPONSE_HEADERS Cache-Control, Content-Encoding, Content-Type, Location A comma separated list of header names whose values should be logged.
COUPER_ACCESS_LOG_TYPE_VALUE couper_access Value for the log field type.
COUPER_BACKEND_LOG_REQUEST_HEADERS User-Agent, Accept, Referer A comma separated list of header names whose values should be logged.
COUPER_BACKEND_LOG_RESPONSE_HEADERS Cache-Control, Content-Encoding, Content-Type, Location A comma separated list of header names whose values should be logged.
COUPER_BACKEND_LOG_TYPE_VALUE couper_backend Value for the log field type.