anchor.diff:          |> withHeader (Accept "application/json")
           |> withHeader (ContentType "application/json")
   //        |> getResponseBody
  +
  +    let postRequest accessKey accountId url =
  +        createRequest Post url
  +        |> withHeader (Custom {name = "X-DexiIO-Access"; value = accessKey})  
  +        |> withHeader (Custom {name = "X-DexiIO-Account"; value = accountId})
  +        |> withHeader (Accept "application/json")
  +        |> withHeader (ContentType "application/json")
   
       let deleteRequest accessKey accountId url =
           createRequest Delete url
  
positive.code:         let url = "https://api.dexi.io/executions/" + executionId + "/file/" + fileId
          getRequest' url
          |> getResponseStream(streamConsumer)
  
  
  
  
negative.code:     let accessKey = Helpers.md5 <| accountId + apiKey
      
      let getRequest' = Helpers.getRequest accessKey accountId
      let postRequest' = Helpers.postRequest accessKey accountId
  
      /// <summary>Fetches information about the state of an execution.</summary>
      /// <param name="executionId">The UUID of the execution.</param>
  