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Session Id : qPgyXgIIfPSCYI29vFF6VM
Power Platform Community / Forums / Power Automate - Using Connectors / Send multi-part form d...
Power Automate - Using Connectors
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Send multi-part form data with flow HTTP task

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Posted on 22 Nov 2019 19:58:18 by SvenG 38

Hi,

 

I have to repost this question as this forum had an issue with my original post.

I'm struggling with multi-part form data. I need to send a binary file to REST API with plain HTTP and no json data.

How is this possible with the flow HTTP task?

 

It's also not possible to upload an image here.

Please see screenshot in link: Flow Task 

 

 

I have the same question (0)
  • Verified answer
    SvenG Profile Picture
    SvenG 38 on 25 Nov 2019 at 13:25:46
    Re: Send multi-part form data with flow HTTP task

    While searching through similar post here I came to some conclusions. 

    What I've found out so far is that one can use a special json syntax for the HTTP body.

     

     

    I got it working now:

     

     

    {
 "$content-type": "multipart/form-data",
 "$multipart": [
 {
 "headers": {
 "Content-Disposition": "form-data; name=\"file\"; filename=\"test.pdf\""
 },
 "body": {
 "$Content-type": "@{items('Auf_alle_anwenden')?['ContentType']}",
 "$content": @{items('Auf_alle_anwenden')?['ContentBytes']}
 }
 },
 {
 "headers": {
 "Content-Disposition": "form-data; name=\"type\""
 },
 "body": "voucher"
 }
 ]
}

     

     

    There was an issue that the API accepts only binary data.  I could resolve it by removing the base64 encoding found in a similar thread.

     

    It's really bad that there is no documentation about the HTTP task at all. 

  • SvenG Profile Picture
    SvenG 38 on 25 Nov 2019 at 06:56:35
    Re: Send multi-part form data with flow HTTP task

    Hi @v-bacao-msft 

     

    I'm using this API and try to upload a file. They have working example of curl and postman.

     

    Thanks for your support

    Sven

     

     

    Edit, the question now is:

    What's the correct flow task setup for the following curl command:

    curl https://api.lexoffice.io/v1/files
-X POST
-H "Authorization: Bearer {accessToken}"
-H "Content-Type: multipart/form-data"
-H "Accept: application/json"
-F "file=@{PathToImage}" -F "type=voucher"

     

  • v-bacao-msft Profile Picture
    v-bacao-msft on 25 Nov 2019 at 02:09:15
    Re: Send multi-part form data with flow HTTP task

     

    Hi @SvenG ,

     

    Which API do you currently use, and are there any documents for reference?

     

    Best Regards,

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