Background
In the Summer '13 Release Notes on page 238 it states that web service endpoints in the form of instance-api.salesforce.com must be updated to the new format: instance.salesforce.com.
API Endpoint Changes
Prior to Summer ’13, API endpoints for web services used a hostname of the form instance-api.salesforce.com. API endpoints now use a hostname of the form instance.salesforce.com. An example server endpoint URL from a SOAP API connection might look like: https://na1.salesforce.com/services/Soap/c/27.0/00DU0000000Q4f0.
If you have any code that uses a hard-coded API endpoint, you’ll need to update this code. We recommend never hard-coding the API endpoint and instead using the endpoint returned in the response to your initial connection to Salesforce. For example, a SOAP API login() call returns a server URL endpoint that you can use for subsequent SOAP API calls.
Question
Does this only apply to the Standard Web Services API, or does it apply to custom Apex Web Services (created and generated within Salesforce)?
For example...
If I have a custom web service that I created in Salesforce that is consumed by a .Net application, the URL (in the web.config) looks something like this: https://cs15-api.salesforce.com/services/Soap/class/My_Web_Service. Does it need to be updated? Also, note that the partner WSDL references: https://test.salesforce.com/services/Soap/u/26.0.
