[rest] Firefox Add-on RESTclient - How to input POST parameters?

I've installed Firefox RESTclient add-on but , I'm having hard time figuring out how to pass POST parameters. Is there a specific format to do this? Or is there any other tool which can be used to debug an REST API on Mac OS X ?

Request header needs to be set as per below image.

request body can be passed as json string in text area.

I tried the methods mentioned in some other answers, but they look like workarounds to me. Using Firefox Add-on RESTclient to send HTTP POST requests with parameters is not straightforward in my opinion, at least for the version I'm currently using, 2.0.1.

Instead, try using other free open source tools, such as Apache JMeter. It is simple and straightforward (see the screenshot as below)

Here is a step by step guide (I think this should come pre-loaded with the add-on):

1. In the top menu of RESTClient -> Headers -> Custom Header
2. In the pop-up box, enter Name: Content-Type and Value: application/x-www-form-urlencoded
3. Check the "Save to favorite" box and click Okay.
   Now you will see a "Headers" section with your newly added data.

4. Then in the Body section, you can enter your data to post like:

   username=test&name=Firstname+Lastname
   

5. Whenever you want to make a post request, from the Headers main menu, select the Content-Type:application/x-www-form-urlencoded item that you added and it should work.

You can send the parameters in the URL of the POST request itself.

Example URL:

localhost:8080/abc/getDetails?paramter1=value1&parameter2=value2

Once you copy such type of URL in Firefox REST client make a POST call to the server you want