Is possible get file contents in workflow using rest API?

in my workflow is 2013 and implements to office 365:

my header:

Accept: application/octet-stream
Content-Type: application/octet-stream
binaryStringResponseBody: true

url call(rest api):

https://<site>/_api/Web/getfilebyserverrelativeurl('<site relative>/SitePages/Home.aspx')/$value

Note: i has created dictonary to header and to output of ResponseContent.

then Call url HTTP web service with request(ResponseContent to dictionaryresponse...) // here failed call

Error details:

System.IO.InvalidDataException: Unable to deserialize HTTP response content. Expected ContentType : 'application/json', 'text/plain' or 'text/html', Received ContentType : 'application/octet-stream'. 

have some idea of how resolve this?