HTTP Server Examples

Example 1: Getting Iotellect Server Version

This example shows how to get the version of the Iotellect Server using HTTP request.

  • Find Drivers/Plugins node in the System Tree and double-click HTTP Server plugin.
  • Add new record to the HTTP Server Settings Table.
  • Type version in the URI field.
  • Type set(dt(), "responseBody", 0, {:status$version}) in the expression field.
  • Chose user for expression evaluation. For example: users.admin.
  • Go to http:// localhost :8080/version

If everything is done right, resulting page will show version of the Iotellect Server.

Example 2: Getting Iotellect Server Status Information

For handling requests with parameters and for other complicated cases, where one expression is not enough, it is better to use models and their rule sets. Using environment variables to store intermediate results will greatly simplify the request handling.

This example shows how to get any information from the status table of the Iotellect Server.

  • Find Drivers/Plugins node in the System Tree and double-click HTTP Server plugin.
  • Add new record to the HTTP Server Settings Table.
  • Type req in the URI field.
  • Type {users.admin.models.model:request(dt())} in the expression field.
  • Chose user for expression evaluating. For example: users.admin.

The second step includes creating model and configuring its rule sets.

  • Create new absolute model with name "model".
  • Select Rule Sets tab.
  • Add new rule set with name "request".
  • Add to rule set following rules:

Target

Expresion

Condition

Comment

parameterValues

cell({requestParameters}, "values")

value

cell({env/parameterValues},"value")

result

cell({:status} ,{env/value})

Final Rule Set Result

set(dt(), "responseBody", 0, {env/result})

And save changes. Now you can try the following requests:

  • http://localhost:8080/req?parameter=version
  • http://localhost:8080/req?parameter=name
  • http://localhost:8080/req?parameter=uptime

In these requests, the parameter value can be the name of any field of the status table.

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