Request format is unrecognized for URL unexpectedly ending in

I was trying to access the Webservice method using REST Easy Firefox Plugin

While doing that I got the below error

Request format is unrecognized for URL unexpectedly ending in <Method Name>

Thanks to this SOF answer for the work around given here for quick reference.
Add protocol tags in web.config

<configuration>
    <system.web>
    <webServices>
        <protocols>
            <add name="HttpGet"/>
            <add name="HttpPost"/>
        </protocols>
    </webServices>
    </system.web>
</configuration>