Reference : JSON REST API reference : Element collection : PUT method
  
PUT method
This example shows how to use the PUT method to update multiple attributes through one HTTP request. The content type for this request is multipart/related.
URL: https://fpserver.com:9443/fp/resources/workspaces/5/modules/1/elements/.json
Accept header: multipart/related
Request body:
{"attributes":[{"elementId":99,"attributeId":257,"textValue":"ele-99"}, {"elementId":100,"attributeId":257,"textValue":"ele-100"}]}
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Element collection