Section 11.7.7.1 Multipart Batch Request Body gives three examples for request URL formats that implementations must support:

The request URL of individual requests within a batch request or change set can use one of the following three formats:

Unfortunately all three examples use the GET method, which can mislead readers to assume that GET requests are allowed within a change set, which is not the case according to the preceding section 11.7.2 Request Dependencies.