FormPost3

Method signature	`ContentProxy.FormPost2(url, parameters, headers, cookies, succeededCallback, failedCallback)`
Input Parameters	`url`	The URL of the target location.
	`parameters`	The parameters passed to the given url. The parameters object basically is a dictionary which contains the parameter’s name and value as a key-value pair.
	`headers`	An array of headers used to create the request object. Each header object is a one-dimensional array having two elements. The first element is the name of the header and the second one is its value. For example: `[ ["Content-Type","text/plain"], ["X-MyHeader","uoo"] ]`
	`cookies`	An array of cookies used to create the request object. Each cookie object is a one-dimensional array having two elements. The first element is the name of the cookie and the second one is its value. For example: `[ [“session_id”,“abc123”], [“cart_status”,“foobar”] ]`
	`succeededCallback`	The function that is invoked when the operation succeeds.
	`failedCallback`	The function that is invoked if the operation fails.
Callback Parameter	Content of HTTP response as string.
Note	FormPost2 method performs an HTTP POST operation.

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