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iOS Build a Weather App with Swift Interacting with Data From the Web Constructing a URL

Amit Kalra
Amit Kalra
3,078 Points
Posted by Amit Kalra
Amit Kalra
3,078 Points

Absolute URL

This challenge is telling me to create an absolute URL, which I think I'm doing, I checked in Xcode, it seems to work fine. Why is the challenge marking this as wrong?

urls.swift 
import Foundation

var treehouseCourseID = 25

// Add your code below

let treehouseBaseURL = NSURL(string: "https://api.teamtreehouse.com/")

let courseURL = NSURL(string: "/course/\(treehouseCourseID)", relativeToURL: treehouseBaseURL)
Chokdee Srisuk
Chokdee Srisuk
19,384 Points

You are using the wrong address in a constant of courseURL which is relative to baseURL. It's just a little error of a parenthesis appears in the courseURL. Check this out.

let courseURL = NSURL(string: "course/(treehouseCourseID)", relativeToURL: treehouseBaseURL)

Hopefully it can help you out.

2 Answers

Greg Kaleka
Greg Kaleka
39,021 Points
Greg Kaleka
Greg Kaleka
39,021 Points

Hi Amit,

I made EXACTLY this mistake on a PHP project I've been working on, so I feel your pain.

Your base URL ends with a forward slash, and the string you're adding to it starts with a forward slash, so you end up with:

https://api.teamtreehouse.com//course/...

The double slash is the problem. Just drop it from your courseURL constant.

urls.swift 
import Foundation

var treehouseCourseID = 25

// Add your code below

let treehouseBaseURL = NSURL(string: "https://api.teamtreehouse.com/")

let courseURL = NSURL(string: "course/\(treehouseCourseID)", relativeToURL: treehouseBaseURL)

Cheers,

-Greg

Amit Kalra
Amit Kalra
3,078 Points
Amit Kalra
Amit Kalra
3,078 Points

Haha, thank you! Turns out I had that written in Xcode but couldn't notice this difference in the challenge.

Chokdee Srisuk
Chokdee Srisuk
19,384 Points
Chokdee Srisuk
Chokdee Srisuk
19,384 Points

You are using the wrong address in a constant of courseURL which is relative to baseURL. It's just a little error of a parenthesis appears in the courseURL. Check this out.

let courseURL = NSURL(string: "course/(treehouseCourseID)", relativeToURL: treehouseBaseURL)

Hopefully it can help you out.