Question

Is it possible to send data to the server using POST?

Ie) I want to send POST data to url:

http://www.a.com/b?cmd=tt

With POST data:

a=1
b=2

Is it doable and how?

Answer 1

Quote from Mike Cooper on a similar question:

As far as I know, Firebug can’t do this. However, there is a very useful Firefox extension, in the spirit of Firebug, called Tamper Data. This should be able to do what you want.

It allows you to monitor each request made by the browser, and you can turn on an option that allows you to look at, and edit, every single request before it gets sent.

See other answers at source:
How do I POST to a web page using Firebug?

Also see: Using Firebug to send form data

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The above work if you simply want to modify HTTP requests, but to actually create HTTP requests, there is a Firefox extension called Poster, which has the following description:

A developer tool for interacting with web services and other web resources that lets you make HTTP requests, set the entity body, and content type. This allows you to interact with web services and inspect the results…