Application configuration

The following parameters are reserved by the system. You can add your application parameters in the main application configuration file (application.yml) or apply additional configuration files using the ConfigReader API.

Key	Value (example)	Required
application.name	Application name	Yes
info.app.version	major.minor.build (e.g. 1.0.0)	Yes
info.app.description	Something about your application	Yes
server.port	e.g. 8083	Yes
static.html.folder	e.g. /tmp/html	Yes
yaml.rest.automation	Default value is classpath:/rest.yaml	Optional
yaml.mime.types	Optional config file	Optional
mime.types	Map of file extensions to MIME types	Optional
log.format	text, compact or json. default=text	Optional
log.level	default 'info'	Optional
health.dependencies	e.g. 'database.health'	Optional

Static HTML contents

You can place static HTML files (e.g. the HTML bundle for a UI program) in the "resources/public" folder or in the local file system using the "static.html.folder" parameter.

The system supports a bare minimal list of file extensions to MIME types. If your use case requires additional MIME type mapping, you may define them in the application.yml configuration file under the mime.types section like this:

mime.types:
  pdf: 'application/pdf'
  doc: 'application/msword'

Alternatively, you can create a mime-types.yml file and point it using the "yaml.mime.types" parameter.

Transient data store

The system uses a temp folder in "/tmp/composable/node/temp-streams" to hold temporary data blocks for streaming I/O.

Reserved route names

The following route names are reserved by the system.

Route	Purpose	Modules
distributed.tracing	Distributed tracing logger	platform-core
async.http.request	HTTP response event handler	platform-core
temporary.inbox	Event listener for RPC	platform-core
event.api.service	Event API handler	REST automation
actuator.services	admin endpoints (/info, /health, /livenessprobe)	REST automation

Reserved HTTP header names

Header	Purpose
X-Stream-Id	Temporal route name for streaming content
X-TTL	Time to live in milliseconds for a streaming content
X-Async	This header, if set to true, indicates it is a drop-n-forget request
X-Trace-Id	This allows the system to propagate trace ID

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