type 'UploadFileInfo' is not a subtype of type 'String' in type cast

Question

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I am trying to upload a file in flutter using HTTP package with some parameters and some headers. But it's occurring a problem in UploadFileInfo. this is my actual exception:

" type 'UploadFileInfo' is not a subtype of type 'String' in type cast "

Answer 1

The ContentType you're using

application/x-www-form-urlencoded 

is used for encoded strings like:

field1=value1&field2=value2

For usage with FormData the ContentType you need should be

multipart/form-data

as a content type.

But, as far as I know Dio is smart enough to understand it, so you could try omitting the ContentType header too!