How to get RM version number

You could use the /application-about which 1) doesn't need authentication 2) provides a small XML response

<rdf:rdf xmlns:jfs="http://jazz.net/xmlns/prod/jazz/jfs/1.0/" xmlns:oslc="http://open-services.net/ns/core#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dcterms="http://purl.org/dc/terms/">
    <oslc:publisher rdf:about="https://jts03:9443/rm/application-about">
        <dcterms:title>Requirements Management</dcterms:title>
        <jfs:nonlocalizedtitle>Requirements Management</jfs:nonlocalizedtitle>
        <dcterms:description>This application provides the capabilities to create and manage requirements and trace them to modeling, testing, and change and configuration management. You can define, elicit, capture, elaborate, discuss, and review requirements and supporting artifacts.</dcterms:description>
        <dcterms:identifier>http://jazz.net/application/rm</dcterms:identifier>
        <jfs:version>6.0.3</jfs:version>
        <oslc:icon rdf:resource="https://jts039443/rm/web/com.ibm.rdm.web/pages/images/RDNG_16.png"/>
        <jfs:instancename>/rm</jfs:instancename>
    </oslc:publisher>
</rdf:rdf>