Cannot invoke 'append' with an argument list of type '(String)'

Question

I'm constructing multipart form-data request. I'm getting build error for append statements

var dataBody = Data() 
dataBody.append("--\(boundary + lineBreak)") //Error

Error: Cannot invoke 'append' with an argument list of type '(String)'

It's weird as this works in other project. Am I missing something? How to fix this issue?

Answer 1

You're trying to append a string to a Data object which won't compile , you need to convert this string first to Data with proper encoding .utf8 here like this

var dataBody = Data() 
let str = "--\(boundary + lineBreak)"
dataBody.append(Data(str.utf8))