Invoke web service encodes body to ascii??

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Posted on by deg85

Im trying to do a post request in PAD. I am using the Invoke Web Service action but getting a 400 error.

Tried the same request in Postman and that works. SO i checked in Fiddler and realised that the request body is being encoded to ASCII and that is not accepted by the server. I already tried setting the COntent-Type to utf-8.

what are my options please?

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Power Automate Desktop

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VishnuReddy1997 2,656 Super User 2025 Season 2 on at

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Hi @deg85,

Instead of just setting the Content-Type header, try specifying the encoding in the request body explicitly:

Use Content-Type: application/json; charset=utf-8 (if JSON)

Use Content-Type: text/plain; charset=utf-8 (if plain text)

Or try encoding using any one the scripting language before.

Or you can also try this python code to perform post action in Power Automate desktop.

import requests # API endpoint url = "https:" # Replace with the actual API URL # Plain text body text_body = ( "Your Body" ) # Headers headers = { "Content-Type": "application/x-www-form-urlencoded; charset=utf-8" } # Sending the POST request response = requests.post(url, data=text_body.encode("utf-8"), headers=headers) # Print response print("Status Code:", response.status_code) print("Response Body:", response.text)

(Note:- if you got your solution you can mark as solution and gives kudos)

Thanks & Regards
Vishnu Reddy

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