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How to convert text file to ByteArray and send it via API



kindly need your support in below,


I have Text file, I have to convert it to byteArray and send it through REST API, I tried many ways to convert the file to byteArray, last one is:
- ExecuteScript with below code:
import base64
import codecs

with'/path/to/input/file.txt', 'r', encoding='utf-8') as file:
file_content =
file_bytes = file_content.encode('utf-8')
encoded_bytes = base64.b64encode(file_bytes)
encoded_string = encoded_bytes.decode('utf-8')

flowFile = session.putAttribute(flowFile, 'fileContent', encoded_string)
session.transfer(flowFile, REL_SUCCESS)


but still get error: utf-8' codec can't decode byte 0xff in position 0: unexpected code byte in <script> at line number 6


REST API Config:
API URL:.....
Request Content-Type: application/octet-stream

authentication User: username

 authentication password: password


we applied it in as below:
Function CallApi(APIURL As String,filepath As String) As String

Dim req As WebRequest = WebRequest.Create(APIURL)
Dim txtfile = File.ReadAllBytes(filepath"file.txt")
System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12
ServicePointManager.ServerCertificateValidationCallback = AddressOf AcceptAllCertifications
req.Headers("Authorization") = "Basic " & Convert.ToBase64String(Encoding.[Default].GetBytes("username:password"))
req.Method = "POST"
req.ContentType = "application/octet-stream"
Dim byteArray As Byte() = txtfile
req.ContentLength = byteArray.Length
Dim dataStream As Stream = req.GetRequestStream()
dataStream.Write(byteArray, 0, byteArray.Length)
' response
Dim resp As WebResponse = req.GetResponse()
Dim s As Stream = resp.GetResponseStream()
Dim sr As StreamReader = New StreamReader(s, Encoding.UTF8)
Dim doc As String = sr.ReadToEnd()
Return doc
End Function

Any suggestions may help me to achieve this?


Community Manager

@MukaAddA, Welcome to our community! To help you get the best possible answer, I have tagged in our NiFi experts @SAMSAL @cotopaul @steven-matison who may be able to assist you further.

Please feel free to provide any additional information or details about your query, and we hope that you will find a satisfactory solution to your question.


Vidya Sargur,
Community Manager

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