Web API : what is the post key value ?

[simoncn]

There is not always a key for a POST request. This depends on the content type. For a content type of text/plain, there is no key.

Under Body in CocoaRestClient, you need to check 'Raw input'. This gives you an input field without keys. I have tried doing this in CocoaRestClient with a content type of text/plain and it is working for me.