REST API for BIP Reports

Hi Team,

I got a REST API for running the BIP reports. But it is returning 400 Bad Request even after passing the correct report path as a URI parameter.

sample

curl -X POST -u username:password -o report_output.html -H
      "Content-Type:multipart/form-data"  -v -F
      'ReportRequest={"attributeFormat":"html","attributeTemplate":"Publisher
      Template"};type=application/json' 
http://host.com:port/xmlpserver/services/rest/v1/reports
/Sample%20Lite%252FPublished%20Reporting%252FReports%252FBalance%20Letter/run

URL

https://docs.oracle.com/cd/E96933_01/bip/BIPAP/op-v1-reports-reportpath-run-post.html

BIP Version : Oracle BI Publisher 12.2.1.4.0

Could you please help us with the sample Request and Response Payloads.