All documented web services allow for the submission of multiple operations (i.e. sub-requests) within each HTTP request.

For GET Requests:

Multiple comma-separated identifiers can be submitted within URL parameters as follows:

?identifiers=<id-0>,<id-1>,<id-2>…&another_param=<some-value>

For POST Requests:

Multiple operations can be submitted within each request body:

[
  {
    … Resource/operation 0 request data …
  },
  {
    … Resource/operation 1 request data …
  },
  {
    … Resource/operation 2 request data …
  },
  … Additional resource/operation requests … 
]

Expected Format of the Response JSON:

This is the expected format for every web service:

[
  {
    … Resource/operation 0 result data …
  },
  {
    … Resource/operation 1 result data …
  },
  {
    … Resource/operation 2 result data …
  },
  … Additional resource/operation results … 
]