This is called using pagination and the URL is a bit different than what you have. You should have something more like this.
This will give you a response that includes a URL that will contain the next page of data. You can get the format that needs to be used and an example of the response from this website. (http://developer.constantcontact.com/docs/developer-guides/paginated-output.html)
Is there anyway to get Constant contact token using Requesting URL . Currently I am using Constant contact Authentication window to get token. I attached the screen shot with this mail.
But I need a URL to get authentication token. Please help me on this and let me know how to proceed and how to take Token from it.
Without being able to see the code behind that window I couldn't say for sure what method is being used. However; it does not look like it is using oAuth 2. I am just guessing, but it is probably using a URL to request the Access Token. If you can look at the code you will probably see the information being sent.
I would suggest setting up your application to take advantage of oAuth 2 and you can find that documentation located here. http://developer.constantcontact.com/docs/authentication/authentication.html
If you just need to get an Access Token you can also retrieve that data using our I/O Docs located here. https://constantcontact.mashery.com/io-docs
I have done all my work relating constant contact with your valuable information.There is one requirment is pendining in my work. I am working in SAP B1 development.
As per your update I have added constant contact authenticatin in my project. Is there any hope to pass the costant contact username to a string after authetication. If its possible thats good for us.
I have attached the screen shot of my form and authentication form with this mail.