SOLVED: How do I know that URLSession.shared.data throws an Error in SwiftUI

@maxbobse

Jan '23

Below code catches an Error object "error" when the server is not available:

    do{
        let (data, urlResponse) = try await URLSession.shared.data(for: request)
    } catch {
        print(error)
    }

When I read up on the documentation of URLSession.shared.data it is nowhere mentioned that it also throws an error (for URLSession.shared.dataTask for example it states explicitly that an error item is part of the returned values).

I mean the code is working but how would I KNOW that it returns an error object? That part is absolutely not transparent to me.

@roosterboy HWS+

Jan '23

The method signature for URLSession.data(for:delegate:) looks like this:

func data(
    for request: URLRequest,
    delegate: URLSessionTaskDelegate? = nil) async throws -> (Data, URLResponse
)

See that throws in there? That's what tells you the method throws errors.

@maxbobse

Jan '23

Thank you sir, makes sense! :)

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