In this recipe, we will be adding the
sendPostRequest:toUrl: method to the
WebServiceConnectAsynchronous class that we created in the Performing HTTP(S) asynchronous GET requests recipe. If we follow the HTTP specifications to the letter, we would use the HTTP
POST request when we want to send data to a server for processing. For example, if you fill out an HTTP form (for instance, from a login page), you would submit an HTTP
POST request that contains the form information.
To perform a
POST request, you should have some data to post to the server. This data takes the form of a key-value pair, just like the
GET query request. We also submit the data in the same format as the
GET query request, where ...