Validate query param if it exists in Apigee edge

[zaheen555]

Hi,

I have a requirement to validate a query param if it exists in the url

Consider the below example

www.example.com/employees?name=alex

I wanted to check if query parameter 'name' exists in the url and if it exists check whether query parameter 'name' is passed as empty string or null. For example

www.example.com/employees?name

OR

www.example.com/employees?name=

I tried the request.queryparams.names, it gives the collection of params but I cant find a way to use it or loop it. Array.includes() on request.queryparams.names doesnt seem to work. Is there a way to convert request.queryparams.names to array or any other solution to this issue?

Thanks

[dchiesa1]

You can use a condition like request.queryparam.name = null in your proxy flow, to check for an absent query param. Example:

  <Flows>
    <Flow name='t1'>
      <Request>
        <Step>
          <Name>RF-Missing-QParam</Name>
          <Condition>request.queryparam.name = null</Condition>
        </Step>
        ...more steps here...
      </Request>
      <Response>
        ...
      </Response>
      <Condition>proxy.pathsuffix MatchesPath "/t1" and request.verb = "GET"</Condition>
    </Flow>
     ...