Swift: making url from string relative to base url

Question

Having simple endpoint enum, like:

enum TraccarEndpoint: Endpoint {

    case server

    var baseURL: URL {
        return URL(string: "http://demo.traccar.org/api")!
    }

    var path: String {
        switch self {
        case .server:
            return "/server"
        }
    }

    var url: URL {
        let path = self.path
        let baseURL = self.baseURL
        let url = URL(string: path, relativeTo: baseURL)
        return url!
    }
}

expecting self.url = "http://demo.traccar.org/server", but self.url = "/server -- ttp://www.traccar.org/api". What is that?

Fare

you can simplify your url property var url: URL { return URL(string: path, relativeTo: baseURL)! } Also no need to include slash in your server string return "server" – Pelagia

Answer 1

It's the way an URL is described. Your url is correct don't worry. Print url.absoluteString to convince yourself

You can get absolute URL with url.absoluteURL

Crap

Not really, little slash made huge difference. When slash ('/server') was in path component I got error (using url parameter as URLConvertible in Alamofire.request call, BUT when I've included that slash to baseURL and removes it from path everything works! – Fare

And in both cases (Success and Failure) url.absoluteString was the same... – Fare

Answer 2

I found the solution moving the / from the path to the baseURL:

http://demo.traccar.org/api/ 

instead of

 http://demo.traccar.org/api

and: server instead of /server

Mulligatawny

Answer 3

Below are a few examples of how baseURL and relative paths interact:

NSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];
[NSURL URLWithString:@"foo" relativeToURL:baseURL];                  // http://example.com/v1/foo
[NSURL URLWithString:@"foo?bar=baz" relativeToURL:baseURL];          // http://example.com/v1/foo?bar=baz
[NSURL URLWithString:@"/foo" relativeToURL:baseURL];                 // http://example.com/foo
[NSURL URLWithString:@"foo/" relativeToURL:baseURL];                 // http://example.com/v1/foo
[NSURL URLWithString:@"/foo/" relativeToURL:baseURL];                // http://example.com/foo/
[NSURL URLWithString:@"http://example2.com/" relativeToURL:baseURL]; // http://example2.com/

Aspirin

Answer 4

well, I copy your Code

enum TraccarEndpoint {

    case server

    var baseURL: URL {
        return URL(string: "http://demo.traccar.org/api")!
    }

    var path: String {
        switch self {
        case .server:
            return "/server"
        }
    }

    var url: URL {
        let path = self.path
        let baseURL = self.baseURL
        let url = URL(string: path, relativeTo: baseURL)
        return url!
    }
}

The url string is /server -- http://demo.traccar.org/api.

The different thing is TraccarEndpoint do not inheritance Endpoint. Does EndPoint has baseURL String is "http://www.traccar.org/api" ? If it is , you can see this web Method Dispatch in Swift

It can help you know the Method Dispatch about swift.

Tassel