You can parameterize the base URL for the GET and SIMPLE DELETE methods.
For example, you have the following base URL:
www.informatica.com
The Designer uses the information in the base URL and might construct the final URL as follows:
www.informatica.com?firstname=1&lastname=2
When you select the checkbox option to parameterize the base URL in Designer for the GET or SIMPLE DELETE method, then you can edit the base URL to use the mapping parameter or variable as follows:
www.informatica.com/$firstname$lastname
The Integration Services sends the source file values to the first name and last name input port of the HTTP transformation and sends the HTTP requests to the HTTP server specified in the final URL.