Power Platform Community Forum Thread Details

Upload files to Dalux : Content range issue

Hello,

I tried to create a flow, which extract the file from one CDE to upload it in another one (Dalux). I reach to download the files. But, I always have an error :

"httpStatusCode": 400,

"errorCode": "E40004",

"errorCodeMessage": "HeaderValidationFailed",

"message": "Missing or invalid Content-Range Header (remember to include length)",

"logTime": "2025-07-16T14:27:34.3455295Z"

I don't understand because my code respect the syntaxe :

"Content-Range": "@{concat('bytes ',string(variables('Debut')),'-', string(sub(outputs('Compose_1'),1)), '/', string(outputs('Compose_1')))}"

This is the extract of Dalux documentation :

- in: header
name: Content-Range
description: The indices of the bytes of the part of the file being uploaded, along with the total number of bytes
required: true
schema:
type: object
format: "Content-Range: bytes <start index>-<end index>/<total bytes>"
example: bytes 0-255/256

To check the size of the files, I used to way :

- lenght(base64tobinary(variable(chunk)

- I also get it from the metadatas from the initial CDE where I download the file.

I try to do a script on Python to do the same operation and it's work. So I don't understand what is the issue with Power Automate. Would you have any tips ?

Thansk in advance

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Business Process Flows

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