I'm having major issues getting a Power Automate Flow to make a POST call to my Azure Function. I have tested the Azure Function in both the Azure Portal, C# automated unit tests, integration tests in DevOps and via PostMan so I know 100% that the function itself is solid.
The function accepts a JSON body which contains a Base64 encoded string.
The problem here is: Every time I try to use a Base 64 string in the Body from Power Automate - on run it gives me an error message:
BadRequest : Http request failed: the content was not a valid JSON. Error while parsing JSON: 'Unexpected character encountered while parsing value: A. Path", line 0, position 0.'
Now here is the REALLY weird bit - I've checked the Azure Function logs WHILE THIS IS RUNNING and the function executes without any errors, and returns a "200 OK" response code.
This behaviour ONLY appears to happen when the string contains "==" (i.e. the standard closing characters of a Base 64 Encoded String). If I remove those characters from the Body of my request then Flow returns the response object correctly.
I have numerous screenshots of this, including the construction of the Flow (both the edit surface, and the erroring response) as well as the live stream of Azure Function logs at the time the flow executed.
Power Automate "EDIT" mode - HTTP action.
Notice the "Body" contains the Base 64 string value.
On Run - execution error - notice there is no response value - like it didn't even check for a response.
And here are the Azure logs - you can see the console output AND the test in the Azure Portal show a 200 OK response.
the Output response message also shows the plain-text value of the Base64 string (which is what the function is supposed to return).
For reference - I have also included the EXACT same function, but this time just posting a plain-text value (which is not Base 64 encoded)
This time I still get a BadRequest response but the error is coming from my Azure Function as a custom error message.
Here is the simple request action.
Note the FileContents value is NOT a Base64 encoded string anymore.
And here is the Run showing the same HTTP action under testing.
Note that here (unlike the original) we now have a full "OUTPUTS" response object, with visible headers and a custom error message being shown in the response body.
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